#help-with-arduino | adafruit | Page 57

wintry heart May 15, 2020, 9:20 PM

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Ok thanks I'll try that out :)

vocal dew May 15, 2020, 9:28 PM

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hey guys, i have an iot project at my school and my mission is to get an string over Serial.read(), generate a qrcode and print it on the screen. I have brought a nano and a st7765 display, breadboard and jumper cables.

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There are videos about use a qr picture, but i cannot find a gerator, do somebody know one?

wintry heart May 15, 2020, 9:34 PM

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@safe shell I made a quick test and I want to know if my wiring is correct

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📎 image0.png

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This should be easier

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To understand

safe shell May 15, 2020, 9:51 PM

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It's hard to tell, but I don't see a GPIO pin going to the LED. If that's the case, it will always be on, rather than under the control of your code.

wintry heart May 15, 2020, 9:52 PM

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Yep you are correct I just tested it and that’s exactly what it does so what changes should I make and also do I need to make any changes to the code?

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📎 image0.png

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That is the code the YouTube person used

safe shell May 15, 2020, 9:53 PM

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Yes, you need the signal end of the LED circuit to go to a pin, like 8 I think was in the older pictures, and your code then has to write a value to that pin, depending on when/whether you want the LED on or OFF. You'll see this in the learn guide I linked earlier.

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But the issue with that code is that once an hour, it will blip the LED on (pin 8) for 1.5 seconds, so you'll probably never know 😉

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I suspect you want the LED to stay on whenever the sensor says it's dry, and turn off when the sensor says it's moist

wintry heart May 15, 2020, 9:57 PM

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Yeah that’s how the auto watering system worked but I just want it to display an led when the plant needs water so

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I should use the blue cable that is connected to the 8 gpio instead of the positive red cable?

safe shell May 15, 2020, 10:01 PM

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right, and make sure you have the LED oriented with the right polarity

wintry heart May 15, 2020, 10:01 PM

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Ok

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@safe shell It works perfectly now but what changes should I make to the code so it doesn’t flash just every hour?

safe shell May 15, 2020, 10:05 PM

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Well, there are two inout events you are concerned with, right: (1) sensor goes HIGH (which I assume means soil is dry); (2) sensor goes LOW

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So it could be as easy as adding an else that turns the LED off when the sensor is not HIGH

wintry heart May 15, 2020, 10:09 PM

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I am very new to the Arduino ide so what parts of the original code should I take away and what should I add (where should I add that too) thank you so much for helping me

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Here is the untouched code I posted before

📎 image0.png

safe shell May 15, 2020, 10:18 PM

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I could do more if you post the text of the code (between three backticks ` so it formats as code) but... OK, so you see the if (...) {...} block. Currently, the if-test is whether the sensor read is HIGH,

glossy onyx May 15, 2020, 10:19 PM

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ok so i found a guy that made what i was looking for. he made the code and show how he connected everything.... i did the exact same think he did and still does not work. here is his video.... and attach is my copy of what he did.
https://www.youtube.com/watch?v=poXEUKpZgcI

📎 Sensor_RGB_Beta.png

YouTube

Brian van vlymen

pir sensor ws2812b with neopixels

Arduino using 5 volts with 150 pixels done by Neopixel library

the Git code is https://github.com/ironheartbj18/pir-sensor-ws2812b-with-neopixels

▶ Play video

safe shell May 15, 2020, 10:20 PM

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@wintry heart take a look at this https://www.arduino.cc/en/Tutorial/IfStatementConditional it explains how an if then else would work (just the intro stuff, not necessarily the hardware section and beyond)

wintry heart May 15, 2020, 10:22 PM

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int digitalSensor = 2;
int pumpPin = 8; //relay pin

void setup() {
pinMode(digitalSensor, INPUT);
pinMode(pumpPin, OUTPUT);
}

void loop() {
if(digitalRead(digitalSensor) == HIGH){
digitalWrite(pumpPin, HIGH);
delay(1500);
digitalWrite(pumpPin, LOW);
}
delay(3600000); // 1hour
}

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@safe shell that is the code, I read the article but I don’t know much of the Arduino syntax so could you fill in what I need to change so I can copy and paste it ? Thanks!

safe shell May 15, 2020, 10:24 PM

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@wintry heart can you please edit your comment, and put three backticks (the unshifted tilda "~" on a US keyboard) before the code and after the code... makes it much easier on the eyes 😉

wintry heart May 15, 2020, 10:25 PM

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Ok

safe shell May 15, 2020, 10:26 PM

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I'm going to make you work for it 😉 look at this, it's now an if-then-else void loop() { if(digitalRead(digitalSensor) == HIGH){ digitalWrite(pumpPin, HIGH); delay(1500); digitalWrite(pumpPin, LOW); } else { } delay(3600000); // 1hour }

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what do you think you need to do to turn the LED off when you want?

wintry heart May 15, 2020, 10:27 PM

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Would I remove the else statement at the bottom so there is no 1 hour delay?

safe shell May 15, 2020, 10:27 PM

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that delay is outside of the else, so it should be fine (unless you want to check more, or less, often)

wintry heart May 15, 2020, 10:28 PM

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I would like the led to be always off unless the sensor reads high (dry soil)

safe shell May 15, 2020, 10:28 PM

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first of all, you don't need the delay(1500); anymore

wintry heart May 15, 2020, 10:28 PM

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Ok

safe shell May 15, 2020, 10:28 PM

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but what would happen if you moved the digitalWrite(pumpPin, LOW); line into the else{...} section?

wintry heart May 15, 2020, 10:30 PM

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The led would stay off unless it detects dryness (HIGH)

safe shell May 15, 2020, 10:30 PM

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yup

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or technically, it will either turn the LED on or off, depending on whether (digitalRead(digitalSensor) == HIGH) is true or false

wintry heart May 15, 2020, 10:35 PM

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Ok I did a bit of stitching together and got this code will this work

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int digitalSensor = 2;
int pumpPin = 8; //relay pin

void setup() {
  pinMode(digitalSensor, INPUT);
  pinMode(pumpPin, OUTPUT);
}

if-then-else ```void loop() {
  if(digitalRead(digitalSensor) == HIGH){
    digitalWrite(pumpPin, HIGH);
  }
  else { digitalWrite(pumpPin, LOW);
  }

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Whoops I’ll try to fix the lines

safe shell May 15, 2020, 10:36 PM

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I think you have tildas in there instead of backticks

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two tildas makes a strikethrough

wintry heart May 15, 2020, 10:36 PM

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Ok

safe shell May 15, 2020, 10:37 PM

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testing

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📎 Screen_Shot_2020-05-15_at_5.37.09_PM.png

wintry heart May 15, 2020, 10:43 PM

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int pumpPin = 8; //relay pin

void setup() {
  pinMode(digitalSensor, INPUT);
  pinMode(pumpPin, OUTPUT);
}

if-then-else ```void loop() {
  if(digitalRead(digitalSensor) == HIGH){
    digitalWrite(pumpPin, HIGH);
  }
  else { digitalWrite(pumpPin, LOW);
  }```

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something weird is happeniing

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when i try to send by hitting return it returns instead

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of sending

safe shell May 15, 2020, 10:45 PM

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it will do that if you are typing between your backticks. Click outside of the code and then you can return

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you can also edit an existing post (depending on your client, hover over to the right for the little "..." menu, or "Edit" link)

wintry heart May 15, 2020, 10:48 PM

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int digitalSensor = 2;
int pumpPin = 8; //relay pin

void setup() {
  pinMode(digitalSensor, INPUT);
  pinMode(pumpPin, OUTPUT);
}
void loop()  {
if-then-else void loop() {
  if(digitalRead(digitalSensor) == HIGH){
    digitalWrite(pumpPin, HIGH);

  }
  else {digitalWrite(pumpPin, LOW);
  }```

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@safe shell is that good

safe shell May 15, 2020, 10:49 PM

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Look again at the format of an if statement at the link I posted. How about this (just the loop() part):

  if(digitalRead(digitalSensor) == HIGH){
    digitalWrite(pumpPin, HIGH);
  }
  else {
    digitalWrite(pumpPin, LOW);
  }
  delay(3600000); // 1hour
}```

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Other than the "if-then-else" before the void loop, I think what you put would probably compile

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You may want to rename the "pumpPin" at some point to be more descriptive of what you are doing.

wintry heart May 15, 2020, 10:51 PM

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yeah i edited the code above does it seem ok?

safe shell May 15, 2020, 10:53 PM

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you can check it in the Arduino IDE anytime by clicking the checkmark to compile it 🙂

wintry heart May 15, 2020, 10:54 PM

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ok

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ill test it

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📎 Screen_Shot_2020-05-15_at_6.55.45_PM.png

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so it says this

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did i miss a space

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or mess up the syntax

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?

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i am now confused

safe shell May 15, 2020, 11:02 PM

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look at the code I posted. The "if-then-else" doesn't belong before void loop (or anywhere). there are also two void loop()s

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you can just delete that whole highlighted line

wintry heart May 15, 2020, 11:10 PM

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@safe shell now this happens do i need to move the bracket?

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📎 Screen_Shot_2020-05-15_at_7.10.09_PM.png

reef ravine May 15, 2020, 11:11 PM

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add one more } at the very end

wintry heart May 15, 2020, 11:12 PM

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after the one that is highlighted or a line below it ?

reef ravine May 15, 2020, 11:12 PM

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for best "style" on a new line below

wintry heart May 15, 2020, 11:12 PM

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ok thanks

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it works now thanks

reef ravine May 15, 2020, 11:13 PM

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it makes the code much more readable if you use indentation, it's easier to tell where each section starts and ends

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that last } closed the void loop()

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in C++ (arduino) the code will compile fine, in Python it must be indented properly

sage mural May 16, 2020, 12:11 AM

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@cyan jasper great! What resistor would be good for this? I rather lose a bit of range than another uno

cyan jasper May 16, 2020, 12:11 AM

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depends on your potentiometer value

cedar mountain May 16, 2020, 1:05 AM

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@cyan jasper Do you think the lack of a resistor fried the Uno? I can't come up with a reasonable way for that to have happened in the situation described.

cyan jasper May 16, 2020, 1:10 AM

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I don't even remember the case TBH. Last couple of days were a rush

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I kind of the as main parts but I didn't expect a this late reply

lapis ore May 16, 2020, 3:41 AM

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Out of curiosity, is it possible to do something like this?

digitalWrite(pumpPin, HIGH) if(digitalRead(digitalSensor) == HIGH) else digitalWrite(pumpPin, LOW)

or can you only do variable assignments?

cedar mountain May 16, 2020, 3:45 AM

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Sure, you can do any statement in the "if-else" block, although the order you have there is weird unless you're using Python.

lapis ore May 16, 2020, 3:45 AM

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Yes, I was referring to python

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So then can you do something like this?

digitalWrite(pumpPin, digitalRead(digitalSensor) )

cedar mountain May 16, 2020, 3:47 AM

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Yep, can also do that.

lapis ore May 16, 2020, 3:47 AM

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huh.. cool... I'm still very new to this... Thank you!

compact gust May 16, 2020, 8:51 AM

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I have a plan to control how far a stepper motor moves depending on the value of the ultrasonic sensor. for example if the sensor reads 1000 the motor goes 20ft, then if it goes up to 1500 it goes an extra 5 ft. then if it goes back to 1000 the motor will move back to the 20 ft mark. any tips?

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nema 17 motor

calm crown May 16, 2020, 9:48 AM

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can you implement a variable if you use platformIO? with an arduino

loud nest May 16, 2020, 7:17 PM

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Hello Everyone!
I am wondering if it is possible to change the mapping from pin 16 to pin 13 (arduino ide mapping) on the LoRa Radio Feather???
#define RFM95_RST 16 -> #define RFM95_RST 13
and use with the ESP8266 Huzzah????

📎 unknown.png

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I get the error:
ERROR: Failed to put device in LoRa mode.
RH_RF95_REG_01_OP_MODE: 8
LoRa radio init failed

odd fjord May 16, 2020, 8:24 PM

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Pin 13 is MOSI -- needed for SPI -- have you looked at this guide https://learn.adafruit.com/radio-featherwing/wiring

loud nest May 16, 2020, 9:01 PM

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I have, I just realized i can't do that

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I LITERALLY as I am typing this was testing out using A (arduino pin 0) and it works with the esp8266 Huzzah board

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This means I have pin 16 free to connect to RST ( of the arduino) and I can use both the Lora module AND the deepsleep function, I was getting scared that this would not work

dense valve May 16, 2020, 10:33 PM

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Does anyone know how to file an issue ticket with https://github.com/adafruit/Talkie - there's something unusual about that project in GitHub as there's no Issues tab.

GitHub

adafruit/Talkie

Speech library for Arduino. Contribute to adafruit/Talkie development by creating an account on GitHub.

cedar mountain May 16, 2020, 11:35 PM

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The issues tab can be disabled in a project's GitHub settings if you don't want to accept bug reports, though I don't know whether that was on purpose or an accident in this case.

dense valve May 16, 2020, 11:36 PM

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@cedar mountain Thanks, that was my first guess but I've not fiddled with that much. I put some tickets in on the original project in the end.

sage mural May 17, 2020, 1:03 AM

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@reef ravine thanks for the help! im not sure if its the fuse

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i have a strange issue now

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📎 IMG_20200517_100701.jpg

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why doesnt the LED light up? :S

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im perplexed

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did i get a faulty Uno board?

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there seem to be some default sketch going on with blinking l-led (pin 13)

flint smelt May 17, 2020, 1:12 AM

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@sage mural there is definitely a default sketch that blinks pin 13.

sage mural May 17, 2020, 1:13 AM

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works fine in tinkercad btw... 😆

flint smelt May 17, 2020, 1:13 AM

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Can you try other LEDs?

sage mural May 17, 2020, 1:13 AM

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i did, and they are all the same

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quite sure they are not all broken...

flint smelt May 17, 2020, 1:14 AM

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Right. It shows voltage going through the LED

sage mural May 17, 2020, 1:14 AM

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also, if they were burned i think i wouldnt have 5v over it

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no clue what to do next... , i think i should stick to software... 😩

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it doesnt draw enough current or something?

flint smelt May 17, 2020, 1:15 AM

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Wait, you're measuring voltage from 5v to GND which of course is 5v

sage mural May 17, 2020, 1:16 AM

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ok let me measure over LED

flint smelt May 17, 2020, 1:16 AM

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I normally put the resistor on the GND side though it shouldn't make a huge difference

sage mural May 17, 2020, 1:16 AM

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i checked in tinkercad and it should be the same

flint smelt May 17, 2020, 1:16 AM

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The LED might be reverse, voltage only goes one way (it's a diode)

sage mural May 17, 2020, 1:17 AM

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no then the voltage would be 0

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i flipped it and checked

flint smelt May 17, 2020, 1:17 AM

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No because you're not measuring the voltage correctly

sage mural May 17, 2020, 1:17 AM

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ah

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what points should i measure over?

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wait, no, if i flip the diode then there will be 0 volts

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regardless where i measure

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as the circuit is not closed anymore

flint smelt May 17, 2020, 1:19 AM

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The multimeter closes the circuit

sage mural May 17, 2020, 1:20 AM

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Oh...

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you are right

flint smelt May 17, 2020, 1:21 AM

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Essentially you're measuring the voltage as if the LED was not there, as if you took the wire from 5v to red MM wire and GND to black MM wire

sage mural May 17, 2020, 1:21 AM

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Right

flint smelt May 17, 2020, 1:22 AM

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So measure from either side of the resistor

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Are you getting a voltage reading?

sage mural May 17, 2020, 1:23 AM

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Yes

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Am i checking the voltage to see if the diode+r closes the circuit or not?

flint smelt May 17, 2020, 1:24 AM

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Are you sure your LEDs are in the visible light spectrum 😋

sage mural May 17, 2020, 1:24 AM

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green led now :p

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should be...

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i think it just doesnt draw the current needed?

flint smelt May 17, 2020, 1:25 AM

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That would mean the resistor is of the wrong value

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The resistor is there for current limiting

sage mural May 17, 2020, 1:25 AM

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i had these LEDs work fine with the other board until i broke it 🙂

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exactly

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even if i would break the new LEDs there would be a brief flash

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everything has been utterly dim so far

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The resistor is 1kohm

flint smelt May 17, 2020, 1:34 AM

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You have the LED connected to 5v and GND and you've verified that you get 5v on that rail... there's nothing wrong with the UNO, the problem is in your circuit somewhere

sage mural May 17, 2020, 1:36 AM

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Hm right

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By the way, is 4.5v normal?

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Installed the drivers now just be sure...

flint smelt May 17, 2020, 1:37 AM

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Let me see what mine shows, I was wondering if that was a little too low

sage mural May 17, 2020, 1:38 AM

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Right?

flint smelt May 17, 2020, 1:38 AM

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That's definitely not going to be involved at that point. You didn't connect the MCU to the circuit, your circuit is purely using the power circuitry of the UNO

sage mural May 17, 2020, 1:38 AM

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but maybe the voltage gets shared with the LED branch?

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although the current draw is too low to emit and photons...

flint smelt May 17, 2020, 1:42 AM

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I've got 4.9 on my Leonardo (my UNOs use regular Type B connectors and I don't have any handy)

sage mural May 17, 2020, 1:42 AM

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Hmm

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So something is definitely going on

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maybe these leds need closer to 5v to work?

flint smelt May 17, 2020, 1:44 AM

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The MCU seems to not care though

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I don't think so

sage mural May 17, 2020, 1:48 AM

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How can I measure if they get enough current?

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Current meter in series?

wind nimbus May 17, 2020, 1:50 AM

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@sage mural , good night, are you trying to blink this led? https://discordapp.com/channels/327254708534116352/537365760008257569/711384415523307540

flint smelt May 17, 2020, 1:57 AM

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@wind nimbus he's just trying to get it to light up using the 5v rail

wind nimbus May 17, 2020, 1:58 AM

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Oh

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I didnt see

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Sorry

flint smelt May 17, 2020, 1:58 AM

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@sage mural yes, in series

wind nimbus May 17, 2020, 1:58 AM

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You could try to inverse

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Resistor on GND

cedar mountain May 17, 2020, 2:01 AM

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Stupid question: is the LED polarity backwards?

flint smelt May 17, 2020, 2:01 AM

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I asked the same stupid question 😛

sage mural May 17, 2020, 2:02 AM

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long leg (anode) is on +5v side

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wow

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on the 20m current setting i get

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exactly 20.0 , is that 20mA ? that would be what i was expecting

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but that makes things even weirder

flint smelt May 17, 2020, 2:03 AM

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Try the next setting up

sage mural May 17, 2020, 2:03 AM

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2m

flint smelt May 17, 2020, 2:03 AM

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Yeah, just to see

sage mural May 17, 2020, 2:04 AM

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that gives 1.

flint smelt May 17, 2020, 2:04 AM

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Sorry, not 2, 200

sage mural May 17, 2020, 2:04 AM

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ah

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i see, only precision change

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thought it was a multiplier

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so still around ~20.5

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this is super weird...

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everything seem normal except theres no photos emitting

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Hmm, wait

flint smelt May 17, 2020, 2:09 AM

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The precision change is what I was looking for

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That's not good

sage mural May 17, 2020, 2:10 AM

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sorry

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ive been using the breadboard the wrong way last 5 min

flint smelt May 17, 2020, 2:10 AM

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Is that true with other LEDs as well?

sage mural May 17, 2020, 2:10 AM

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one sec

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oh

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lol

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i used it wrong earlier too, in the picture

flint smelt May 17, 2020, 2:10 AM

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Oh, did you have both legs in the same row?

reef ravine May 17, 2020, 2:11 AM

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let there be light?

sage mural May 17, 2020, 2:11 AM

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not sure whats wrong with me

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:/

flint smelt May 17, 2020, 2:11 AM

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It happens... good news is, you probably won't make that mistake again! 😛

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You'll find new and more frustrating ones to make 😉

sage mural May 17, 2020, 2:12 AM

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ok works

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LOL

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that was the dumbest one hour of my life

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not sure how i didnt catch that, got a bit tricked by placing the first R over the gap and then continuing on that row maybe

reef ravine May 17, 2020, 2:13 AM

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so the UNO works again?

sage mural May 17, 2020, 2:14 AM

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This is not UNO i broke the other day

reef ravine May 17, 2020, 2:14 AM

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ahhh

sage mural May 17, 2020, 2:14 AM

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That one is definitely broken, probably a fuse like you said

reef ravine May 17, 2020, 2:14 AM

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can you measure resistance?

sage mural May 17, 2020, 2:14 AM

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yes

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i need to try to see if my potentiometers are any good now again

reef ravine May 17, 2020, 2:15 AM

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with power removed what do you read across the fuse on the bad one?

sage mural May 17, 2020, 2:16 AM

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in the pic you sent, you meant the USB fuse right?

reef ravine May 17, 2020, 2:16 AM

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you should use 5K to 10K pots BTW

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yes

sage mural May 17, 2020, 2:17 AM

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thanks for explaining by the way, i didnt notice first because of discord mention tab not showing it

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5K to 10K means min is 5L and max is 10K?

reef ravine May 17, 2020, 2:17 AM

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from the power jack the regulator protects you, from USB the fuse protects your PC

sage mural May 17, 2020, 2:18 AM

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📎 IMG_20200517_111559.jpg

reef ravine May 17, 2020, 2:18 AM

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rule of thumb, 5 to 10 K is a good value to breadboard with

sage mural May 17, 2020, 2:18 AM

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i designed and printed these flight controls

reef ravine May 17, 2020, 2:18 AM

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nice

sage mural May 17, 2020, 2:18 AM

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each of them has a potentiometer as that was all i could get from amazon in japan

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📎 received_1380817435442833.jpeg

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upside down

flint smelt May 17, 2020, 2:19 AM

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@sage mural 5k to 10k max resistance, I believe

sage mural May 17, 2020, 2:19 AM

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but this one is 10k i believe

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i had problems reading the data sheet for it

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but what is the min R for it?

reef ravine May 17, 2020, 2:21 AM

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@flint smelt I think the input impedance on 328P is rather high, most any old pot will do

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@sage mural across the pot it should read 10K

sage mural May 17, 2020, 2:22 AM

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the blue thing in the pic i just shared

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it does say 10K

reef ravine May 17, 2020, 2:22 AM

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from one end or the other to the wiper it should vary from 0 to 10K

sage mural May 17, 2020, 2:22 AM

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is that the max resistance value?

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📎 unknown.png

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here, flipped and cropped it

reef ravine May 17, 2020, 2:23 AM

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yup, 10K

sage mural May 17, 2020, 2:23 AM

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but what would be the lowest?

flint smelt May 17, 2020, 2:23 AM

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0

sage mural May 17, 2020, 2:23 AM

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oh

reef ravine May 17, 2020, 2:23 AM

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across it is 10K

sage mural May 17, 2020, 2:24 AM

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so i better put a 1K resistor in series just to be sure not to fry my arduino again?

reef ravine May 17, 2020, 2:24 AM

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from one end or the other it varies from 0 to 10K

sage mural May 17, 2020, 2:24 AM

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i realized that everytime i would hit one end on the pot the arduino would restart

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i think that was because i shorted it

reef ravine May 17, 2020, 2:24 AM

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no need for another resistor if wired correctly

sage mural May 17, 2020, 2:24 AM

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but 0 ohm would short circuit the board?

reef ravine May 17, 2020, 2:24 AM

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if it restarted it likely wasn't wired correctly

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you should have a constant 10K across ground and +5, no problem there

sage mural May 17, 2020, 2:25 AM

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ah

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i see

reef ravine May 17, 2020, 2:25 AM

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the A0 input will see 0 volt to 5 volts

sage mural May 17, 2020, 2:25 AM

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i cant be sure i wired it correctly

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basically all anodes and cathodes of the pot share a solder point before going in to 5v / gnd

reef ravine May 17, 2020, 2:26 AM

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no anodes / cathodes on a pot

sage mural May 17, 2020, 2:26 AM

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ok

#

but the far end pins

#

i didnt care which side was which

#

knowing that i could flip the 5v and gnd later

#

something happen with the l-led blinking btw while was doing this

#

earlier it was blinking equal time on/off

#

now its off, on and then some flashing , repeat

reef ravine May 17, 2020, 2:29 AM

#

it may be running the default blink sketch

sage mural May 17, 2020, 2:29 AM

#

i think thats what it was doing earlier

#

i havnt uploaded anything yet

#

but now the blinking pattern changed

reef ravine May 17, 2020, 2:30 AM

#

many new units come loaded so the built in LED blinks on power up

sage mural May 17, 2020, 2:30 AM

#

yeah i read that

flint smelt May 17, 2020, 2:30 AM

#

@reef ravine he's saying it's not blinking normally

sage mural May 17, 2020, 2:31 AM

#

but the blinking changed after first connecting it earlier today

reef ravine May 17, 2020, 2:31 AM

#

ok

sage mural May 17, 2020, 2:31 AM

#

only thing i did was install drivers

reef ravine May 17, 2020, 2:31 AM

#

which IDE are you using, the Arduino IDE?

sage mural May 17, 2020, 2:32 AM

#

vscode

reef ravine May 17, 2020, 2:32 AM

#

ok

sage mural May 17, 2020, 2:32 AM

#

anyway, i'll try to connect the pots and use serial monitor now to read the analog a0 pin

reef ravine May 17, 2020, 2:33 AM

#

can you load up the standard blink sketch just to be sure the UNO is behaving?

sage mural May 17, 2020, 2:33 AM

#

yeah

#

good idea

#

this https://www.arduino.cc/en/Tutorial/Blink

Arduino - Blink

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

reef ravine May 17, 2020, 2:34 AM

#

if it's working ok, then a few lines of code, three wires and bob's your uncle

sage mural May 17, 2020, 2:34 AM

#

yeah 🙂 thats what i was hoping for the other day

#

i will be using UnoJoy for this btw

reef ravine May 17, 2020, 2:35 AM

#

that code is fine to test with

sage mural May 17, 2020, 2:36 AM

#

ok uploaded and works

#

blinking nice and slow

#

will change the time just to be 100%

reef ravine May 17, 2020, 2:36 AM

#

cool, it's good to go

sage mural May 17, 2020, 2:37 AM

#

yep works

#

ok

#

will test pots now, whats a good way, dim 3 leds?

#

or just use serial monitor?

reef ravine May 17, 2020, 2:38 AM

#

https://www.arduino.cc/en/tutorial/AnalogInput

Arduino - AnalogInput

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

sage mural May 17, 2020, 2:38 AM

#

int potValue = analogRead(A0);
Serial.println(potValue);

reef ravine May 17, 2020, 2:38 AM

#

let's make sure you get what you expect on the monitor first

#

might want some delay(250); in the loop

#

(just so the serial doesn;t scroll so quickly)

#

bots are sensitive in here, i went to put delay( < 3 X's>) and it yelled at me 🙂

#

@sage mural before you power up make sure you read ~10K from ground to +5

#

with the knob in the middle

sage mural May 17, 2020, 2:56 AM

#

@reef ravine yeah i have a 10ms delay

#

not getting anything from serial port

#

[Starting] Opening the serial port - COM8
[Info] Opened the serial port - COM8

reef ravine May 17, 2020, 2:58 AM

#

did you setup Serial(xyz)?

#

in the sketch

#

sorry, Serial.begin(9600); // open the serial port at 9600 bps: in setup() first

#

then print in the loop Serial.print(my_value); // prints my_value

sage mural May 17, 2020, 3:02 AM

#

Ah right, i removed that , thought it was optional

#

ok works now

#

Not sure i understand how to use the resistance measuring on the multimeter

#

switch it to the 200 setting for Ohm section

#

measuring without power connected over a 1k resistor gives me nothing

flint smelt May 17, 2020, 3:04 AM

#

200 isn't enough digits for 1k

reef ravine May 17, 2020, 3:04 AM

#

for a 10 K pot switch to 20K (one range higher than what you expect to measure)

#

and never measure resistance while powered

sage mural May 17, 2020, 3:04 AM

#

oh

reef ravine May 17, 2020, 3:04 AM

#

what do the printed values do?

#

in Serial?

sage mural May 17, 2020, 3:05 AM

#

0.2 @ 20k for a 1kohm R is that right?

#

sorry, still measuring if i get 10k ohm on the pot without power

reef ravine May 17, 2020, 3:06 AM

#

if you leave the leads where they are and twist the knob what happens?

sage mural May 17, 2020, 3:07 AM

#

the R value changes

#

which it shouldnt

#

i soldered the 3 pots 5v pins together , same with the gnd pins

flint smelt May 17, 2020, 3:09 AM

#

That sounds right to me

reef ravine May 17, 2020, 3:09 AM

#

ok, what you think is one end is actually the middle

flint smelt May 17, 2020, 3:09 AM

#

the pins soldered together part

reef ravine May 17, 2020, 3:09 AM

#

R should not change between one end and the other

sage mural May 17, 2020, 3:09 AM

#

hmm but middles are not connected

#

they are 3 separate cables

#

would go into a0, a1, a2 respectively

reef ravine May 17, 2020, 3:10 AM

#

take a step back

flint smelt May 17, 2020, 3:10 AM

#

@sage mural he's saying he thinks you might not have accurately identified the wiper... maybe it's not the "middle" pin after all

reef ravine May 17, 2020, 3:11 AM

#

those look like good pots, the pinout may not be obvious

#

(cheap ones are)

sage mural May 17, 2020, 3:11 AM

#

right,

#

if the middle pin isnt the wiper then i screwed up

reef ravine May 17, 2020, 3:12 AM

#

not yet 🙂

sage mural May 17, 2020, 3:12 AM

#

ok anyway, you must be right, the wiper cant be the middle one

reef ravine May 17, 2020, 3:12 AM

#

it usually is, but maybe not on this one

sage mural May 17, 2020, 3:13 AM

#

📎 IMG_20200517_121310.jpg

flint smelt May 17, 2020, 3:13 AM

#

So all you have to do is check the resistance across different pairs until you find the pair that reads 10k no mater the wiper position

reef ravine May 17, 2020, 3:13 AM

#

exactly

sage mural May 17, 2020, 3:13 AM

#

true

#

seemed like all arduino documents involving pots assume middle pin is wiper

flint smelt May 17, 2020, 3:14 AM

#

I would assume that myself

reef ravine May 17, 2020, 3:14 AM

#

yes, and for the pots most commonly used it is

flint smelt May 17, 2020, 3:14 AM

#

Until evidence proved otherwise lol

reef ravine May 17, 2020, 3:15 AM

#

good pots (like the one you are using) can be pinned any old way, we'll need to measure it

#

does your meter have leads that let you hook them up and leave a hand free to twist the knob?

sage mural May 17, 2020, 3:17 AM

#

no, but i secured the leads in another way 😉

reef ravine May 17, 2020, 3:17 AM

#

ok, what does that pair read?

sage mural May 17, 2020, 3:18 AM

#

📎 IMG_20200517_121729.jpg

reef ravine May 17, 2020, 3:18 AM

#

good enough

sage mural May 17, 2020, 3:18 AM

#

need to cut or desolder the 5v and GND cable intersections

#

just thinking which will leave me less work after finding the wiper

flint smelt May 17, 2020, 3:18 AM

#

@sage mural I like your ingenuity lol

sage mural May 17, 2020, 3:19 AM

#

hehe

#

Well thanks, i'll take it 🙂

#

hmm

#

either way, isnt it possible to wire up pots with only 5v and wiper?

#

ok

reef ravine May 17, 2020, 3:22 AM

#

here it is: https://www.bourns.com/docs/Product-Datasheets/3590.pdf

#

look at the 2nd page

sage mural May 17, 2020, 3:22 AM

#

measuring one of the outer pins to signal i get R from 0 to 10k now finally

reef ravine May 17, 2020, 3:24 AM

#

yes, the very top pic on the page shows which pin is which

flint smelt May 17, 2020, 3:24 AM

#

So the wiper is the pin closest to the back?

reef ravine May 17, 2020, 3:24 AM

#

looks like, yes

sage mural May 17, 2020, 3:24 AM

#

i dont understand the pic :/

#

schematic only says CCW / CW

reef ravine May 17, 2020, 3:25 AM

#

@sage mural not really your fault to be confused by this !

flint smelt May 17, 2020, 3:25 AM

#

@sage mural they are numbered... you can see in the schematic pic that pin 2 is the wiper and pin 2 is in the back

reef ravine May 17, 2020, 3:25 AM

#

look at the top of the page for the numbers in circles

#

most pots are NOT wired this way

sage mural May 17, 2020, 3:26 AM

#

btw this says 200 to 10k

#

but i can measure all the way down to 0

reef ravine May 17, 2020, 3:27 AM

#

the data sheet covers many values, yours is 10K

flint smelt May 17, 2020, 3:27 AM

#

Those numbers represent the max resistance of different variations of that pot... I think

sage mural May 17, 2020, 3:27 AM

#

yeah, even have accuracy close to 0

reef ravine May 17, 2020, 3:27 AM

#

yes, that SERIES goes from 200 to 10K

sage mural May 17, 2020, 3:27 AM

#

gotcha

flint smelt May 17, 2020, 3:27 AM

#

Every pot I've ever used was 0-X ohms

sage mural May 17, 2020, 3:28 AM

#

i see, interesting

#

i guess you can just add the res you want in series for the low value

#

so would make no sense to have a min,max range rather than 0,max

flint smelt May 17, 2020, 3:28 AM

#

Yes

reef ravine May 17, 2020, 3:29 AM

#

sorry, the manufacturer has a series of products, all almost the same, nothing to do with series circuits

sage mural May 17, 2020, 3:29 AM

#

anyway, so ...

#

right, i got that dw 🙂

#

but

#

do i really need gnd here?

flint smelt May 17, 2020, 3:29 AM

#

And then you can map the values (0-max) to what ever range you want to in code

sage mural May 17, 2020, 3:29 AM

#

cant i just use signal and 5v ?

reef ravine May 17, 2020, 3:29 AM

#

let's get the pot wired up

#

@sage mural in this application, no, in some, yes

flint smelt May 17, 2020, 3:30 AM

#

The pot needs to be grounded... you only need to switch the middle and back pins

sage mural May 17, 2020, 3:30 AM

#

at least what you guys are saying is consistent 😉

reef ravine May 17, 2020, 3:30 AM

#

do you see the circled numbers in top left corner?

sage mural May 17, 2020, 3:30 AM

#

yesd

#

they are in 2,1,3 order

flint smelt May 17, 2020, 3:31 AM

#

Just to be clear... @reef ravine is way better than me at this stuff... he's been doing it a LOT longer 😄

sage mural May 17, 2020, 3:31 AM

#

assuming wiper is first pin

reef ravine May 17, 2020, 3:31 AM

#

too long 😩

sage mural May 17, 2020, 3:31 AM

#

lol

reef ravine May 17, 2020, 3:31 AM

#

wiper = 2 = pin in back

sage mural May 17, 2020, 3:31 AM

#

yes, so first one

#

as in furthest away one if you are using the pot

reef ravine May 17, 2020, 3:32 AM

#

yes

sage mural May 17, 2020, 3:32 AM

#

not sure how to explain that well...

#

but yes

#

ok

#

so should be fairly quick to fix

reef ravine May 17, 2020, 3:33 AM

#

and then, from ground to pin A0 should go from near 0 to near 10K

#

(and we don't care which way the knob turns, can fix it in code if needed)

sage mural May 17, 2020, 3:36 AM

#

so middle one is 5v right?

#

right

reef ravine May 17, 2020, 3:36 AM

#

or ground but yes pick +5

sage mural May 17, 2020, 3:36 AM

#

or just switch the 5v and gnd inputs to board

#

or just 1-a0 later..?

#

ok

reef ravine May 17, 2020, 3:37 AM

#

either way - big problem was which pin was the wiper

sage mural May 17, 2020, 3:37 AM

#

just want to get the color coding of my cables right

#

yes

#

agree

flint smelt May 17, 2020, 3:37 AM

#

The polarity of the other two doesn't matter that much

#

Like I said, I'd just swap the back and middle pins to do the least soldering

reef ravine May 17, 2020, 3:38 AM

#

a picture is worth a thousand words

#

not many parts are marked so clearly

flint smelt May 17, 2020, 3:38 AM

#

So true

#

@sage mural in that last picture of the pot you sent, I'm referring to the red and purple (magenta?) wires

reef ravine May 17, 2020, 3:40 AM

#

or to put another way, not the white wire

sage mural May 17, 2020, 3:55 AM

#

@flint smelt yeah, those are the only colors i had!

#

almost done soldering

reef ravine May 17, 2020, 3:56 AM

#

ok

sage mural May 17, 2020, 3:56 AM

#

have the worst desk for this

sage mural May 17, 2020, 4:25 AM

#

Works now, yey!

reef ravine May 17, 2020, 4:27 AM

#

what do the values go from / to?

sage mural May 17, 2020, 4:39 AM

#

0/1024 so 10 bit

reef ravine May 17, 2020, 4:39 AM

#

i meant on the serial

sage mural May 17, 2020, 4:40 AM

#

oh , yeah actually 0 and 961

reef ravine May 17, 2020, 4:41 AM

#

thats pretty close, real world is a little off from theory

#

congrats on getting it working

sage mural May 17, 2020, 4:53 AM

#

actually this is with a 1k res in series before the pot

#

i was still worried about shorting it

#

but now the lowest R will be 3.33k ohm

#

(from the 3 pots in parallell)

#

so i can dare to remove it maybe 🙂

#

Huge thanks for all help,. will try it out with unojoy in the msfs2020 later on 🙂

#

@reef ravine @flint smelt

reef ravine May 17, 2020, 4:54 AM

#

you have three pots, going to 3 analog inputs?

flint smelt May 17, 2020, 4:55 AM

#

@sage mural anytime

sage mural May 17, 2020, 5:23 AM

#

@reef ravine correct!

calm crown May 17, 2020, 9:40 AM

#

someone has any idea why it gives an error?

📎 unknown.png

cursive abyss May 17, 2020, 9:50 AM

#

Hi, can some one please help me with my project. I want to make a heart beat sensor that detects my BPM and IBI and draws a graph showing the value of the sensor. The sensor is the famous Pulse Sensor (3 leads with the purple lead). My current issue is that the sensor is very unreliable with the results. however, when using someone else's code it functions just fine.

#

msg me if you could help and i will send you my code. Thank you guys in advance.

wind drift May 17, 2020, 11:06 AM

#

Is it possible to only set the pin for SoftwareSerial RX?

wind drift May 17, 2020, 11:29 AM

#

Right now I just set RX to 10 and TX to 99. Is that okay to do?

reef canopy May 17, 2020, 11:51 AM

#

@@calm crown
\n ist a problem. Serial.println already creates a new line.
I would Split this line in 3 lines:
Serial.println("Distance = ");
Serial.print(distance);
Serial.print(".");
But there might be a better solution.

dawn yoke May 17, 2020, 11:54 AM

#

Hello, can someone help me to know if my project is possible? I can connect to voice chat and speak Spanish or English

north stream May 17, 2020, 12:31 PM

#

I have hearing issues, so voice chat is not really an option for me. Can you describe what you want to do in text?

sage mural May 17, 2020, 1:53 PM

#

Hmm im missing these two pins, to go into DFU mode

#

https://www.reddit.com/r/arduino/comments/2hymf4/dfu_mode_for_arduino_clone/

r/arduino - DFU mode for Arduino clone?

2 votes and 6 comments so far on Reddit

#

@reef ravine i checked that fuse btw, it was close to 0. so im guessing it didnt protect the mega

north stream May 17, 2020, 4:14 PM

#

Might be a polyfuse, which is self-resetting

sand spruce May 17, 2020, 4:18 PM

#

anyone know what to do here?

📎 unknown.png

north stream May 17, 2020, 4:21 PM

#

Looks like a code block all by itself. Normally there ought to be a function definition there.

ornate kindle May 17, 2020, 6:04 PM

#

so... idk if i can ask help but ok, i get a code for a arduino robot it uses the motor shield l293d and it works well and also uses a servo motor and a hc-sr04 but before i dindt have the servo motor but now i add the server motor. on the code when it detects a wall it will move a little bit back then look to the sides and chooses the side with more space to move but the servo never wanted to work it was bugged moving like if it was glitched and i would like to helped to fix this . Thanks

north stream May 17, 2020, 6:46 PM

#

Could be a timing problem or a power supply problem

#

And it is okay to ask for help, that's what these channels are for

ornate kindle May 17, 2020, 6:53 PM

#

thanks i dont see any voltage problem at least a obvius one but im using 2 4 battery holder for batterys type AA in series

reef ravine May 17, 2020, 7:07 PM

#

@ornate kindle what voltage are your servos rated for? most will work at 5 or 6 volts, 2x4AA in series is +12 volts

ornate kindle May 17, 2020, 7:09 PM

#

@reef ravine they are connected via the l293d motor shield and on videos they use voltages between 9-12V

reef ravine May 17, 2020, 7:16 PM

#

https://learn.adafruit.com/adafruit-motor-shield-v2-for-arduino/using-rc-servos

Adafruit Learning System

Adafruit Motor Shield V2

Stackable, high current DC and Stepper motor shield

#

for one or two small servos you may not need external power, the shield will drive DC motors at higher voltages which is why it mentions up to 16 volts

#

a nice shield but how you drive DC motors, servo motors and stepper motors is different

ornate kindle May 17, 2020, 7:50 PM

#

that shield its to far away from mine

#

this is the shield

📎 unknown.png

#

also ignore some wires i solder to the jumpers on the sensor

reef ravine May 17, 2020, 8:36 PM

#

@ornate kindle Sorry, I'm in and out this afternoon, is the servo attached in the upper left corner?

ornate kindle May 17, 2020, 8:40 PM

#

@reef ravine the wire comes from the right

reef ravine May 17, 2020, 8:41 PM

#

I have to walk the dogs, please copy a link to your board here and I'll take a look in a little bit

ornate kindle May 17, 2020, 8:46 PM

#

i dindt understand maybe its because im portuguese or im just losing brain cells

wind drift May 17, 2020, 8:47 PM

#

bluetooth question:

I have a variable called "mode".

But when I want to send it via BLE I get the following error:

#

no matching function for call to 'BLEUart::write(String&)'

#

bleuart.write(mode);

#

Okay seems this one is working

   bleuart.write(mode.c_str());

ornate kindle May 17, 2020, 9:02 PM

#

@reef ravine i dindt understand maybe its because im portuguese or im just losing brain cells

reef ravine May 17, 2020, 11:05 PM

#

@ornate kindle no worries I don't speak Portuguese but I understand you, I am back at home now. Can you put the link to the website of the L239D module you have and paste it here in Discord?

#

@ornate kindle Por favor, coloque um link para o site da sua placa aqui (Google translate, love it)

atomic wadi May 18, 2020, 12:25 AM

#

I have a stepper motor (S L Motor SL39STH25 1334A NO.20180420) and an Arduino nano, and I'm hoping to get them to communicate in some fashion.

From my understanding, that motor is a bipolar motor, so the 4 leads coming off it are A+/-, and B +/-

Is there a way to connect directly to the Arduino nano, or do I have to use a motor control / driver board? If I do need a board, which is the smallest / best bang for the buck?

reef ravine May 18, 2020, 12:29 AM

#

@atomic wadi you'll need a driver, it's not good practice to connect a motor of any sort directly to a logic pin

atomic wadi May 18, 2020, 12:31 AM

#

Gotcha, is there a recommended driver for the nano? I see a few that are pretty large — but I only need the single motor connection.

reef ravine May 18, 2020, 12:31 AM

#

something like this https://www.aliexpress.com/item/32892331606.html?

aliexpress.com

US $0.5 |5V Stepper Motor 28BYJ 48 + ULN2003 Driver Test Module for...

Smarter Shopping, Better Living! Aliexpress.com

#

the driver module handles the large currents needed

#

https://www.arduino.cc/en/reference/stepper

Arduino - Stepper

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

atomic wadi May 18, 2020, 12:39 AM

#

Awesome, thank you!

reef ravine May 18, 2020, 12:39 AM

#

very welcome

#

@atomic wadi I'm waiting for parts for this http://www.brokking.net/yabr_main.html

atomic wadi May 18, 2020, 12:42 AM

#

Oh nice! Placing that battery on the top makes it even more impressive... that thing is about as unstable as you can make it LOL

reef ravine May 18, 2020, 12:45 AM

#

apparently putting the weight up high helps, his tutorials are very good I find

#

it's amazing the things you can do with a nano...

#

but take it from me - no matter how amazing your projects - friends and neighbors will yawn unless it BLINKS 🙂

atomic wadi May 18, 2020, 12:49 AM

#

Bahahaha, you're absolutely right >__<

reef ravine May 18, 2020, 12:59 AM

#

@atomic wadi that link above is for a 5 wire stepper, this is better suited https://usa.banggood.com/Geekcreit-3D-Printer-Stepstick-DRV8825-Stepper-Motor-Driver-Reprap-4-Layer-PCB-p-920162.html

www.banggood.com

Geekcreit® 3D Printer Stepstick DRV8825 Stepper Motor Driver Reprap...

Online Shopping at Banggood.com！

proven mauve May 18, 2020, 6:13 AM

#

So, I need to use some pulldown resistors for unused inputs on a chip and also for icsp headers. For the unused inputs I'm planning on a 1/10th watt bussed resistor and I want to do the same for the icsp but am I going to burn out the resistor bus if I send 5v data over the header? ~~One of the headers is for an ATmega32U4 (like a pro micro or leonardo)~~ I had forgotten the 32U4 doesn't need the pulldowns, but the other chip on the board does, VS1053B.

#

I assume to solve this I need to look at the maximum rating for the pins of the VS1053B and see how much current they can potentially draw, and then do the math from there to see if 1/10th watt will work?

atomic wadi May 18, 2020, 6:29 AM

#

I concur.

proven mauve May 18, 2020, 6:29 AM

#

So, if I'm using 100k resistors... and the pulldowns are on the 5v side of a 74HC4050 level shifter (5v <-> 3v) then only 53µA should be crossing the resistors at any given time, right? And it doesn't really matter that the pins are rated to 50mA because.... the maximum current over the resistors will always be below this regardless of what the pins are doing....

#

I think that works out to 280.9µW on the 5v side, or 0.28mW.... so I should be nowhere near blowing out 1/10W pulldowns if I'm thinking correctly...

#

I hope =X

cedar mountain May 18, 2020, 6:39 AM

#

Your thinking is correct. Pullups and pulldowns should not be dissipating any substantial amount of power.

proven mauve May 18, 2020, 6:40 AM

#

Thank you very much. I guess that's why they can fit so many into these tiny chips lol

sage mural May 18, 2020, 7:54 AM

#

Hmm think i can squeeze in a 20w solenoid valve and a 60w diaphragm pump on a 6A @ 12V dc adapter?😆

visual quarry May 18, 2020, 8:07 AM

#

Can someone please help me with something?

#

at the bottom i labelled the button Turbo and when i press it i want it to click ludicrously fast

📎 fight_stick_alpha_2.ino

#

it would be great if u guys could help

#

.

wind drift May 18, 2020, 8:33 AM

#

I have another small issue. I have a barcode scanner attached to my circuit. Most of the time it works fine, but sometimes I get random characters as part of the barcode.

#

like this:
⸮V⸮⸮⸮+A40151595*+

#

normal: +A40151595*+

#

Any ideas what the problem could be?

#

Maybe it's because my voltage drops from 3.3 to 2.9V?

#

And I assume in that case I need to use a capacitor, right?

#

Here are the infos from the barcode scanner:

VCC - 3.3V
Current: max. 100 mA. (I usually see less - it's kinda random?)
On-time: 3-4 sec.

visual quarry May 18, 2020, 9:25 AM

#

at the bottom i labelled the button Turbo and when i press it i want it to click ludicrously fast

#

It would be great if u guys could help

proven mauve May 18, 2020, 11:09 AM

#

@visual quarry a simple way would be to go right into that turbo == low area and make it press, then delay(10); then release;

#

I'm on my phone so it's not very easy to actually write the code

#

but that way each time it loops through the button check it will press it and release it instead of only pressing it. And a delay that short will mash the button really fast and not hold up the rest of the program too bad

#

something like this:

if (buttonState11 == LOW) {
Keyboard.press( 0xE9);
delay(10);
Keyboard.release(  0xE9);
}
else{
Keyboard.release(  0xE9);
}```

visual quarry May 18, 2020, 11:27 AM

#

Thanks

#

🙏🏻

#

So just replace what I have there?

proven mauve May 18, 2020, 1:31 PM

#

Yes, I would try it and see how it works

wind drift May 18, 2020, 2:43 PM

#

How do I fix this

📎 unknown.png

#

it keeps saying com port busy

#

nevermind restart helped

#

Okay weird. I connected a boost-buck converter (1.8-5V -> 3.3V) to the VCC pin of the barcode scanner

#

when I scan it's even worse

#

before 1 scan out of 10 has issues

#

now it's 7 out of ten

cedar mountain May 18, 2020, 3:04 PM

#

Can you describe how it's otherwise connected? Any chance the serial connection is not grounded, for instance?

wind drift May 18, 2020, 3:17 PM

#

VCC to 3.3V
GND to GND
TX to D10
Trigger to D13 & button (other side or button to GND)

#

BarcodeID:
+A40151595*+
adding
BarcodeID:
+A40151595*+
adding
BarcodeID:
+A401515⸮⸮*+
adding
BarcodeID:
+A4015⸮⸮⸮⸮e⸮+A40151595*+
adding
BarcodeID:
+A40151595*⸮+A40151595*+

#

    code += (char)barCodeSerial.read();
  }

  if (code.startsWith("+BNR*+") == false && code.endsWith("*+") == true) {

    if (scanmode == "adding"){
      Serial.println(scanmode);
      bleuart.write(scanmode.c_str());
      Serial.println("BarcodeID:");
      bleuart.write("BarcodeID:");
      Serial.println(code);
      bleuart.write(code.c_str());
      
      code = "";
      
      singleBeep();
    }```

#

This is the code I use

cedar mountain May 18, 2020, 3:33 PM

#

Is your Arduino running on 3.3V as well?

wind drift May 18, 2020, 3:34 PM

#

Yep

#

nRF52840 feather express

cedar mountain May 18, 2020, 3:35 PM

#

Is there any chance that the scanner is expecting you to have a pull-up on TX rather than directly driving the pin high itself?

wind drift May 18, 2020, 3:36 PM

#

Odd thing is.

If I attach other modules to the buck converter too it gets even worse.

If I only attach the barcode scanner to the buck converter and other modules to arduino 3.3V it is okay-ish (still errors sometimes)

I checked the voltage on the buck converter and there is no voltage drop

#

I don't think so.

Trigger has to be pulled down to start the scan (that's where the button is connected to GND)

Once it successfully reads the code it automatically sends it via TX to the arduino.

Indicates start of the code
*+ Indicates end of the code

cedar mountain May 18, 2020, 3:42 PM

#

Can you link to the scanner datasheet?

wind drift May 18, 2020, 3:49 PM

#

📎 PINS_1_ENGLISH-1.jpg 📎 PINS_2_ENGLISH.jpg

#

https://drive.google.com/file/d/0B6cpgi4FbU5kQ21Iam1PQkFPVjg/view?usp=drivesdk

Google Docs

Software+development+manualV1.03_20170421_ENGLISH.doc

#

That's all I have to it

#

But it's weird.

If I only connect the barcode scanner to the boost converter (and other modules to 3.3V arduino) it works 90% fine.

If I connect all modules to the boost converter then it only works 10% of the time.

#

The arduino has a voltage drop from 3.3 to 2.9V.

#

The boost converter stays at 3.3V always

cedar mountain May 18, 2020, 4:11 PM

#

I'm not quite understanding the scenario. What is the Arduino being powered from?

wind drift May 18, 2020, 4:11 PM

#

Arduino power from micro USB

#

So I connect the boost converter to 3.3V on the arduino

#

And from there to the barcode scanner

cedar mountain May 18, 2020, 4:13 PM

#

So what is dropping to 2.9V?

wind drift May 18, 2020, 4:16 PM

#

The arduino 3.3V pin is dropping to 2.9V when I press the scan button

cedar mountain May 18, 2020, 4:18 PM

#

How is the button hooked up? It sounds like you might be directly shorting a GPIO output to ground or something.

wind drift May 18, 2020, 4:30 PM

#

Arduino D13 (input) to barcode trigger
Both to button pin 1
GND to button pin 2

#

Orange = barcode trigger
White = D13 input
Blue = A3 input (I use this one to wake up the arduino when it's sleeping)

📎 JPEG_20200518_183354.jpg

#

The button at the bottom

cedar mountain May 18, 2020, 4:37 PM

#

Just out of curiosity, if you remove the orange trigger, do you still see the 2.9V drop?

wind drift May 18, 2020, 4:38 PM

#

nope then it does not turn on

#

so no voltage drop

cedar mountain May 18, 2020, 4:39 PM

#

I must say it doesn't make a lot of sense, when the scanner is on a separate power supply from the Arduino.

wind drift May 18, 2020, 4:39 PM

#

now 3,3V to 2.7V when connected

cedar mountain May 18, 2020, 4:40 PM

#

What is the buck-boost being powered from?

wind drift May 18, 2020, 4:40 PM

#

1 sec I will draw it up

#

📎 barcode_scanner_arduino_problem1-01.png

dapper jungle May 18, 2020, 4:51 PM

#

hi im new to arduino and would really help it if someone could help me start programming

#

im trying to make an automatic trashcan lid with sensors but idk what to do with the code

cyan quail May 18, 2020, 4:55 PM

#

What are you using to lift the lid?

wind drift May 18, 2020, 5:00 PM

#

@cedar mountain hope the drawing above is understandable

#

(1 wire missing from barcode scanner to arduino - TX)

cedar mountain May 18, 2020, 5:11 PM

#

So, the Arduino 3.3V is coming from a 600mA LDO, so it really shouldn't droop under load. That's clearly a bad sign.

wind drift May 18, 2020, 5:13 PM

#

Yeah

cedar mountain May 18, 2020, 5:14 PM

#

Your diagram looks reasonable, so my best hypothesis is just that you've got something mis-wired somehow, like what you think is the 3.3V pin is really something else, etc.

wind drift May 18, 2020, 5:14 PM

#

the barcode scanner takes around 100 mA

shut stone May 18, 2020, 5:25 PM

#

hi is there GOOD arduino tutorials out there?

wind drift May 18, 2020, 5:41 PM

#

@cedar mountain Do you think maybe a capacitor could help?

#

📎 unknown.png

raw lynx May 18, 2020, 5:52 PM

#

Hello, is it possible to run a loop of one function (e.g scrolling text on a LED matrix for pin 4) while also running another function (e.g. colored LEDs on pin 6)? AFAIK the only way to loop a function over and over again is the loop but I don't think you can do 2 concurrent loops. I am running off of an arduino uno

cedar mountain May 18, 2020, 5:57 PM

#

@wind drift I mean, it can't hurt, but it doesn't seem like it would fix the problem, if the voltage is drooping long enough for it to show up on your multimeter. Capacitors are mainly good for mitigating microsecond-by-microsecond spikes.

dapper jungle May 18, 2020, 6:17 PM

#

@wind drift just curious, what are you making

elder hare May 18, 2020, 6:25 PM

#

why does this not work (this code is copied from this assisant tool -> https://arduinojson.org/v6/assistant/)

const size_t capacity = JSON_OBJECT_SIZE(1) + 10;
DynamicJsonDocument doc(capacity);

const char* json = "{\"LPS\":\"24\"}";

deserializeJson(doc, json);

const char* LPS = doc["LPS"]; // "24"

error: 'capacity' is not a type
DynamicJsonDocument doc(capacity);

error: 'doc' is not a type
deserializeJson(doc, json);

error: 'json' is not a type
deserializeJson(doc, json);

error: ISO C++ forbids declaration of 'deserializeJson' with no type [-fpermissive]
deserializeJson(doc, json);

error: invalid types '<unresolved overloaded function type>[const char [4]]' for array subscript
const char* LPS = doc["LPS"]; // "24"

#

i have the lastest version "ArduinoJson 6.15.2"

wind drift May 18, 2020, 6:44 PM

#

@cedar mountain I think the issue is a mix of things.

I tried to remove everything else from my code except the barcode scanning part. It seems to always get the right numbers. However at some point it stops responding & I have to restart the arduino.

With my original setup I could scan 100 times without it becoming stuck.

I also just now tried to scan again with my original setup. If I am ~5 cm away from the scanner I often get the weird characters.

If I have it 10 cm away or so it't 99% fine

#

so weird

north stream May 18, 2020, 6:45 PM

#

@wind drift Are you powering the Arduino from your 3.3V source?

#

@elder hare I'm guessing compiler thinks those are function declarations instead of function calls.

elder hare May 18, 2020, 7:16 PM

#

that is weird

cedar mountain May 18, 2020, 7:19 PM

#

Missing an include?

elder hare May 18, 2020, 7:22 PM

#

nah :S i have it included

wind drift May 18, 2020, 7:47 PM

#

@north stream power from microusb

wind drift May 18, 2020, 10:01 PM

#

📎 IMG_20200519_000041.jpg

#

Would it make sense for me to disable the 3.3V output from the voltage regulator

#

And instead connect my buck-boost converter to it

reef ravine May 18, 2020, 11:36 PM

#

@wind drift from the diagram above at 1PM, it looks like the module is only powered when you push the switch?

molten maple May 18, 2020, 11:48 PM

#

i'm a bit worried about your button wiring MuckYu - you have connected the arduino pin and the pin from the scanner to the same node

reef ravine May 18, 2020, 11:50 PM

#

looks like a few things will happen when the button is pushed, not sure they are all by design

livid holly May 19, 2020, 12:34 AM

#

@raw lynx there are a few ways to make it seem like the Arduino is doing more than one thing at a time. The issue is handling timings. If your code doesn't use the delay() function you can control lots of different things in your loop. I like to put each 'thing' into separate functions and then call the functions in the loop. Here is an adafruit article about handling buttons and neopixels at the same time https://learn.adafruit.com/multi-tasking-the-arduino-part-3

Adafruit Learning System

Multi-tasking the Arduino - Part 3

Unleashing the power of the NeoPixel!

raw lynx May 19, 2020, 12:35 AM

#

thank you I was looking for that article!!

livid holly May 19, 2020, 12:43 AM

#

@wind drift are you using D13 on the Arduino as in input? Because that pin is connected to the LED I have never tried to use that as an input. Could that be an issue?

#

Anyone here know how to spec a crystal. The Adafruit Feather M0 proto uses a SAMD21G that needs a crystal. See https://learn.adafruit.com/adafruit-feather-m0-basic-proto/downloads. It has 2 22pf capacitors in parallel. When I look to source crystals on digikey, they want to know the capacitance load. Is it 22pf, or is it 22*22/22+22=11pf.

reef ravine May 19, 2020, 12:51 AM

#

@livid holly you can use D13 as an input, the LED will draw a little more current from whatever is driving it compared to other digital pins

livid holly May 19, 2020, 12:51 AM

#

Ah, cool.

reef ravine May 19, 2020, 12:54 AM

#

the caps are one on each side of the XTAL, not parallel exactly. you'll need two 22pF caps

#

checking spec sheet for crystal specs...

livid holly May 19, 2020, 1:01 AM

#

I was having a hard time reading the spec sheet. I was in the right place, but still wasn't sure. The look parallel to me 🙂

reef ravine May 19, 2020, 1:02 AM

#

there is one on either side of the crystal

#

see page 893, each C load cap is about 20pF (not 40pF as they would be if in parallel)

#

you could precisely calculate the value - but the caps have a pF or three of tolerance

cedar mountain May 19, 2020, 1:15 AM

#

ST has a pretty good application note about picking crystals for STM32 chips which explains a lot of the issues and formulas.

livid holly May 19, 2020, 1:17 AM

#

Ok. So, if I am looking at a schematic that shows a crystal in Mhz, and the 2 capacitors in pf. Is it as simple as picking a capacitance load for the crystal the same as the given caps?

cedar mountain May 19, 2020, 1:18 AM

#

Not that simple, no.

reef ravine May 19, 2020, 1:19 AM

#

https://www.st.com/resource/en/application_note/cd00221665-oscillator-design-guide-for-stm8afals-stm32-mcus-and-mpus-stmicroelectronics.pdf

cedar mountain May 19, 2020, 1:21 AM

#

The external capacitors form a parallel circuit with the crystal which needs to match what capacitance the chip wants.

livid holly May 19, 2020, 1:22 AM

#

Yea, I just found that PDF too, and it looks like the formula I gave before is right. If both are 22, then 22x22/22+22=11. Right?

#

page 12 3.3 Has the formula I think.

#

Er, what do you mean "what the chip wants" Ed?

reef ravine May 19, 2020, 1:25 AM

#

I think you are right, just never gave it much though, most chips want ~20pF

#

the spec sheet for the mcu lists CLoad of 20pF

livid holly May 19, 2020, 1:26 AM

#

Oh, I see. The chip itself is expecting a particular CLoad.

reef ravine May 19, 2020, 1:27 AM

#

and the crystal is tuned to a particular value, CL, which is the parameter that DigiKey wants

livid holly May 19, 2020, 1:27 AM

#

Great. Ok, I think I understand a lot more now. Thanks.

reef ravine May 19, 2020, 1:29 AM

#

I need to go back to the books!, thanks @livid holly @cedar mountain

#

(I always just chuck two 22pFs and a 16MHz at my arduino and call it a day 😕 )

reef ravine May 19, 2020, 1:57 AM

#

@wet crystal this probably belongs in this forum as you'll be using the Arduino IDE. take a look at https://averagemaker.com/2018/04/how-to-set-up-wifi-on-a-wemos.html

Average Maker

How To Set up WiFi on a Wemos | Average Maker

Get your Wemos talking to the world with this short and simple guide on setting up a Wemos WiFi connection via the Arduino IDE.

reef ravine May 19, 2020, 2:42 AM

#

@livid holly this shows the oscillator formula a little differently, jfyr https://en.wikipedia.org/wiki/Pierce_oscillator

flint smelt May 19, 2020, 6:53 AM

#

I'm confused by what's going on with the GFXcanvas8 class in Adafruit_GFX. The drawPixel function takes a uint16_t color, not a uint8_t. That's gotta be a copy/paste error, right? lol

wind drift May 19, 2020, 7:05 AM

#

@reef ravine @molten maple
The white wire goes to D13 (RX arduino)
The orange wire goes to barcode scanner (TX)
The blue wire goes to A3 (input) - I use this as an interrupt to wake up my arduino after it is set to sleepmode.

They are connected to the switch (GND).

#

Even when I remove the blue wire from the button I still get the issue with random characters

wet crystal May 19, 2020, 9:31 AM

#

@reef ravine kk thx

wet crystal May 19, 2020, 11:29 AM

#

@reef ravine Okay, so I now "know" how to setup wifi, I hope I can figure out the rest

#

I guess to accomplish to be secure it does connect I make some "while wifi connect" into setup?

molten maple May 19, 2020, 12:20 PM

#

@wind drift , I think it is not a good idea to mix the White, Orange and Blue wires all on the same node - this could cause some sort of mixed voltages. I would recommend using a different pushbutton which has at least two poles. Keep the Arduino inputs separate from the barcode input (but they can all short to the same ground). Also you should make sure the common ground is connected everywhere, as in the ground of the arduino is connected to the ground output of the boost converter

wind drift May 19, 2020, 1:23 PM

#

Hm I tried that but same problem

#

I kind of have a suspicion what is the issue

#

Once I activated the BLE function it kind of brings the issue?

#


  Serial.println("Please use Adafruit's Bluefruit LE app to connect in UART mode");
  Serial.println("Once connected, enter character(s) that you wish to send");

}


void startAdv(void)
{
  // Advertising packet
  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
  Bluefruit.Advertising.addTxPower();

  // Include bleuart 128-bit uuid
  Bluefruit.Advertising.addService(bleuart);

  // Secondary Scan Response packet (optional)
  // Since there is no room for 'Name' in Advertising packet
  Bluefruit.ScanResponse.addName();
  
  /* Start Advertising
   * - Enable auto advertising if disconnected
   * - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
   * - Timeout for fast mode is 30 seconds
   * - Start(timeout) with timeout = 0 will advertise forever (until connected)
   * 
   * For recommended advertising interval
   * https://developer.apple.com/library/content/qa/qa1931/_index.html   
   */
   
   Bluefruit.Advertising.restartOnDisconnect(true);
  Bluefruit.Advertising.setInterval(32, 244);    // in unit of 0.625 ms
  Bluefruit.Advertising.setFastTimeout(30);      // number of seconds in fast mode
  Bluefruit.Advertising.start(0);                // 0 = Don't stop advertising after n seconds  
}```

#

When I disable all of this I don't get the issue

#

I scan 5 codes- I get 3 with random characters

#

 // startAdv();

  Serial.println("Please use Adafruit's Bluefruit LE app to connect in UART mode");
  Serial.println("Once connected, enter character(s) that you wish to send");

}

/*
void startAdv(void)
{
  // Advertising packet
  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
  Bluefruit.Advertising.addTxPower();

  // Include bleuart 128-bit uuid
  Bluefruit.Advertising.addService(bleuart);

  // Secondary Scan Response packet (optional)
  // Since there is no room for 'Name' in Advertising packet
  Bluefruit.ScanResponse.addName();
  
  /* Start Advertising
   * - Enable auto advertising if disconnected
   * - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
   * - Timeout for fast mode is 30 seconds
   * - Start(timeout) with timeout = 0 will advertise forever (until connected)
   * 
   * For recommended advertising interval
   * https://developer.apple.com/library/content/qa/qa1931/_index.html   
   */
   /*
   Bluefruit.Advertising.restartOnDisconnect(true);
  Bluefruit.Advertising.setInterval(32, 244);    // in unit of 0.625 ms
  Bluefruit.Advertising.setFastTimeout(30);      // number of seconds in fast mode
  Bluefruit.Advertising.start(0);                // 0 = Don't stop advertising after n seconds  

}
  */

#

If I disable all of this I scan 50 codes without any errors

#

Do I maybe have to change the some timing here?

#

It happens when I am connected to bluetooth and when I am not connected to bluetooth

reef ravine May 19, 2020, 2:27 PM

#

@wet crystal I'd get that example working to make sure you are wired right and can connect to your router. Then add the http request to the code, make sure that works, then add the switch or whatever you want to trigger the request.

#

@wind drift it looks like pressing the switch powers up your scanner, shouldn't it be on all the time? Perhaps connect the switch to the trigger input instead? Same advice as to neojunky, break the project down into smaller chunks, get each chunk to work reliably, then add pieces as you go. I'm not sure if the issue is voltage, scanner errors, BLE errors... (If everything is 3.3V, why is the boost converter there at all?)

wet crystal May 19, 2020, 2:40 PM

#

@reef ravine Oh the switch actually physically disconnects the esp from the coin cell

#

I think that will save more power than deepsleep

#

It just goes to deepsleep after activation because its possible that I wont reset it on time

reef ravine May 19, 2020, 2:41 PM

#

yes turning it off is "max deep sleep"...

wet crystal May 19, 2020, 2:42 PM

#

Good

reef ravine May 19, 2020, 2:42 PM

#

using a CR2032 or similar?

wet crystal May 19, 2020, 2:42 PM

#

Yes

#

I can DM you if you want to know what im about to make

#

Its not PG16

reef ravine May 19, 2020, 2:44 PM

#

As I recall the ESP8266 draws a bit of current, the coin cell may not be the best bet

wet crystal May 19, 2020, 2:44 PM

#

I just saw others than run the ESP on coin cell

reef ravine May 19, 2020, 2:45 PM

#

it may be possible, while experimenting I'd recommend a steady power source so power problems don't get mixed up with coding issues

wet crystal May 19, 2020, 2:45 PM

#

Oh yeah thats sure

#

You wanna know what im about to make? You might have a big laugh 😄

reef ravine May 19, 2020, 2:46 PM

#

at a minimum you'll like need to add a fairly good sized cap to smooth "spikes" as the ESP transmits

wet crystal May 19, 2020, 2:46 PM

#

Cap good idea

#

thx

reef ravine May 19, 2020, 2:46 PM

#

sure hit me up, I do need to get to work though

wind drift May 19, 2020, 3:13 PM

#

@reef ravine I only want to use the scanner when I press the button. (to save battery)
I added the boost converter to see if it helps with the barcode scanner dropping the voltage. But no difference.

I disabled/enabled parts of my code 1by1 to test and the issue only happens when I have 'startAdv' active.

#

I assume the bluetooth advertising somehow blocks the communication somehow

wind drift May 19, 2020, 6:22 PM

#

Okay another discovery

#

when I connect

📎 unknown.png

#

RTS to GND

#

it seems to work fine

#

ah no nevermind

#

still some error

wind drift May 19, 2020, 6:46 PM

#

Is there a way to temporarily turn off the advertising?

wet crystal May 19, 2020, 7:10 PM

#

@reef ravine Okay, so far so good, connecting to wifi ✅ Now I gotta insert the http get request. I know the link, how do I write it to the sketch?

wet crystal May 19, 2020, 7:28 PM

#

Link does look like this http://192.168.188.26/win&A=150&T=1&R=255&G=0&B=255&NL=30&NT=20&FX=0

stuck coral May 19, 2020, 7:43 PM

#

In my experience it's time to learn how to write a URI parser @wet crystal . But there might be a library for it floating around somewhere

wet crystal May 19, 2020, 7:44 PM

#

Well its just a "lightswitch"

#

It does matter what comes back

#

As you might see the ip is internal

stuck coral May 19, 2020, 7:53 PM

#

Yes, a parser would in the end return you a array of keys and values so you can do whatever you need to do. To do that you would make sure the HTTP request returns a 200 service code, then find the first instance of a ? or & char and use that as a pointer refrence into a parsing function.

#

However, I found this little reddit post https://www.reddit.com/r/esp8266/comments/43ygld/parsing_data_in_the_url_arduino_ide_for_esp8266/ that has a much better idea for you

r/esp8266 - Parsing Data in the URL (Arduino IDE for ESP8266, using...

3 votes and 6 comments so far on Reddit

wet crystal May 19, 2020, 7:54 PM

#

Okay does it not work to simply use curl

#

Idk about that want to keep it simple

#

As I said, the output of the http get request doesnt matter

stuck coral May 19, 2020, 7:55 PM

#

Oh I see, you want to store this URI in a sketch, sorry, totally misunderstood

wet crystal May 19, 2020, 7:55 PM

#

Yeah more or less

#

📎 ESP8266_Main_Loop.png

#

I got to connect to wifi and it working

stuck coral May 19, 2020, 7:56 PM

#

const char link[] = "URI HERE";

wet crystal May 19, 2020, 7:57 PM

#

Do I put that into global variable?

stuck coral May 19, 2020, 7:57 PM

#

Sure why not, it's good practice not to but it's nice and easy.

wet crystal May 19, 2020, 8:00 PM

#

// Network SSID
const char* ssid = "Nottoday";
const char* password = "Son";
const char* link[] = " http://192.168.188.26/win&A=150&T=1&R=255&G=0&B=255&NL=30&NT=20&FX=0 ";
 
void setup() {
  
  Serial.begin(115200);
  delay(10);
 
  // Connect WiFi
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.hostname("Name");
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
 
  // Print the IP address
  Serial.print("IP address: ");
  Serial.print(WiFi.localIP());
}
 
void loop() {
  
  
  } ```

#

Does this looks right?

#

Besides the serial output, im gonna remove that later

#

Does it really need the []?

wind drift May 19, 2020, 8:08 PM

#

hm okay I just put the baud rate from my barcode scanner from 9600 to 115200. But now it gives me long numbers instead of the barcode

#

102104147147183254102208722214228722214163182254102

#

I tried to use (char) instead but it gives me random ??? symbols

stuck coral May 19, 2020, 8:13 PM

#

Nah, just remove that @wet crystal , there you go, that should work

wet crystal May 19, 2020, 8:14 PM

#

@stuck coral Okay, how do I proceed?

stuck coral May 19, 2020, 8:15 PM

#

https://circuits4you.com/2018/03/10/esp8266-http-get-request-example/

Circuits4you.com

Manoj R. Thakur

ESP8266 HTTP GET Request Example | Circuits4you.com

In this example we learn how to send get request to a web page using NodeMCU or ESP8266? As we know all webpages are HTTP protocols, GET and POST are methods of communicating between web browser and the server. Also we look towards server side php coding.

wet crystal May 19, 2020, 9:23 PM

#

@stuck coral Okay when I understood right I need to copy following lines

#

#include <ESP8266HTTPClient.h>

#

http.begin(Link); //Specify request destination

int httpCode = http.GET(); //Send the request

#

http.end(); //Close connection

stuck coral May 19, 2020, 9:24 PM

#

You got it, ESPs make it pretty easy.

wet crystal May 19, 2020, 9:28 PM

#

It works

#

Nice

#

Just forgott HTTPClient http; in the loop part

#

Now I gotta tell it to go to deepsleep

shrewd cove May 19, 2020, 9:41 PM

#

Are there any integrated circuits i can add to my project so that my LiIon batteries can be charged via a USB C port while the Arduino is still running?

#

I have an ESP8266 with a bunch of buttons as a mini wireless keyboard, but i haven't figured out the charging part yet

wet crystal May 19, 2020, 9:43 PM

#

Yes there is

#

Buy a batterie charge module

#

And solder an USB C plug to it

wind drift May 19, 2020, 9:44 PM

#

Well that's a bummer. Just read that the BLE on the nRF52840 has priority over SoftwareSerial. That's why my barcode is always getting chopped up

shrewd cove May 19, 2020, 9:45 PM

#

@wet crystal like this one?

📎 Screenshot_20200520-004512_Chrome.jpg

wet crystal May 19, 2020, 9:45 PM

#

@stuck coral I dont need to wire GPIO 16 to reset since its not meant to go out of sleep by itself right?

#

@shrewd cove Yeah seems actually pretty neat

shrewd cove May 19, 2020, 9:46 PM

#

Thanks

stuck coral May 19, 2020, 9:46 PM

#

@wind drift The charger should be any charger, which can use any USB interface. For USB-C functions you need a USB-C sink. And @wet crystal you can deepsleep from a timer instead of a GPIO

wet crystal May 19, 2020, 9:47 PM

#

Yeah it isnt supposed to wake up again after it gone sleep

#

Thats the question

stuck coral May 19, 2020, 9:47 PM

#

Oh, if its not supposed to wake up then I quess GPIO IRQ unconnected will work just fine

wet crystal May 19, 2020, 9:47 PM

#

Its just to save power, since I wont reset it that fast after triggering it

stuck coral May 19, 2020, 9:48 PM

#

Well how do you trigger it initially?

wet crystal May 19, 2020, 9:48 PM

#

By releasing something that opens a switch

#

It will be powered by a coin cell

stuck coral May 19, 2020, 9:51 PM

#

OK, I'm stuggling to understand exactly what you're doing but sounds good. Have you measured power consumption of your perticiular ESP8266 board while in deep sleep?

wet crystal May 19, 2020, 9:51 PM

#

No not yet

stuck coral May 19, 2020, 9:52 PM

#

Note if using a coin cell, you need to make sure yor dev board has no parts on it consuming lots of power compared to the deep sleep ESP.

wet crystal May 19, 2020, 9:52 PM

#

Yeah I will remove all unnessecary parts later

#

Or unsolder the chip from the board

shrewd cove May 19, 2020, 9:55 PM

#

How can i charge this kind of batteries with that charger?

📎 Screenshot_20200520-005423_Chrome.jpg

wet crystal May 19, 2020, 9:55 PM

#

Lipo charge module

#

Oh

#

Uhm you need an 18650 socket

#

There is also an ESP module which has 18650 socket + charge module on the board

#

https://pg-cdn-a2.datacaciques.com/wm/NDAy/3849027817/1170369177.jpg

shrewd cove May 19, 2020, 10:02 PM

#

I'll look for a local retailer

#

Thank you

stuck coral May 19, 2020, 10:14 PM

#

Very cool, looks like the PCBs I just got in the mail!

#

📎 05182014512.jpg

#

📎 0518201451a2.jpg

wet crystal May 19, 2020, 11:01 PM

#

Yeah lol

#

😂

#

How easy is it to unsolder the esp8266 chip from the dev board?

#

I'm pretty talented in solderig

#

Also have hot air

stuck coral May 19, 2020, 11:17 PM

#

With hot air you might be able to but the ground pad on the bottom is what may stop you

reef ravine May 20, 2020, 12:57 AM

#

@wet crystal Glad to see you are making much progress!

safe halo May 20, 2020, 8:34 AM

#

Why is my ESP32 serial port outputting data on its own when I have nothing connected to it but when I connect something to it it stops?

#

Nothing is connected to it but it is still outputting

📎 unknown.png

#

I am also having zero luck with being able to request data from an outside server.
On my page I make a request to my server for a JSON file

    fetch(url, {
            credentials: 'omit',
            mode: 'no-cors',
            headers: {
                'Content-Type': 'application/json'
            }
        })
        .then(response => response.json())
        .then(data => console.log(data))
        .catch(err => console.log(err));

#

My AsyncServer is set to and it loads the page but I can still not get the JSON file from the server.

  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
    AsyncWebServerResponse *response = request->beginResponse(SPIFFS, "/index.html", String(), false); 
    response->addHeader("Access-Control-Allow-Origin", "*"); 
    request->send(response); });

knotty bobcat May 20, 2020, 9:08 AM

#

If I have a chararray, each containing another array, how would I go about copying the old array into the new one. I want to be able to edit entries in the new array without affecting the old one, as I will be copying from it multiple times. I've tried iterating through melodyData in a for loop, but that produces an error, so does strcpy.

char notesToPlay[][2] = {};
char melodyData[][2] = {
    {NOTE_C4, 4},
    {NOTE_G3, 8},
    {NOTE_G3, 8},
    {NOTE_A3, 4},
    {NOTE_G3, 4},
    {0, 4},
    {NOTE_B3, 4},
    {NOTE_C4, 4},
    {0, 0}
};

// How to copy `melodyData` into `notesToPlay`?

Context: I'm trying to create a non-blocking piezo snippet, and when event x is fired, I want to copy the array. In my loop function, I'm checking notesToPlay to see if there's anything that I need to handle. Also, please let me know if this is an xy problem 😅

safe halo May 20, 2020, 9:11 AM

#

char melodyData2 = melodyData;

Might work??

knotty bobcat May 20, 2020, 9:20 AM

#

that gives error: invalid conversion from 'char (*)[2]' to 'char' [-fpermissive]

fallen rock May 20, 2020, 9:21 AM

#

Hello, I use arduino on windows and my programs can't televersate. It's the same for Numworks. The error message is "status 1", can u help me plse

safe halo May 20, 2020, 9:56 AM

#

that gives error: invalid conversion from 'char (*)[2]' to 'char' [-fpermissive]
@knotty bobcat
try char

melodyData2(*)[2] = melodyData;

basically make them the exact same when you declare them

wet crystal May 20, 2020, 10:52 AM

#

@stuck coral @reef ravine Okay. Everything works like in the flow chart. I just been curios if I can Improve the bootuptime a bit?

#

#include <ESP8266HTTPClient.h>
// Network SSID
const char* ssid = "Notreally";
const char* password = "brrrrrrr5r";
const char* link = "http://192.168.188.26/win&A=150&R=255&G=0&B=255&FX=0&NL=30&NT=30&NF=1";
 
void setup() {
  
 
  delay(10);
 
  WiFi.hostname("Name");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(10);
  }
}
 
void loop() {
  HTTPClient http;
  http.begin(link);

  int httpCode = http.GET();
  http.end();

  ESP.deepSleep(0);
  
  }```

wind drift May 20, 2020, 11:07 AM

#

{
  // Get the reference to current connection
  BLEConnection* connection = Bluefruit.Connection(conn_handle);

  char central_name[32] = { 0 };
  connection->getPeerName(central_name, sizeof(central_name));

  Serial.print("Connected to ");
  Serial.println(central_name);


}```

#

For BLE there is this function when it connects to a device

#

How can I trigger this in my loop though?

#

Or is there some way to see if I am connected?

#

I need it for a loop

wind drift May 20, 2020, 11:28 AM

#

And how can I disconnect/drop the connection?

wind drift May 20, 2020, 11:43 AM

#

Bluefruit.disconnect(conn_handle); I guess I have to add this somehow in my loop but not sure how (with the conn_handle tag)

wind drift May 20, 2020, 12:17 PM

#

Ok figured it out

#

Now my barcode scanner is properly working with BLE

#

I turn the BLE off when I press the trigger button. Once it detects the full barcode I turn BLE on again.

It reconnects after a second or so and sends the barcode via BLE

reef ravine May 20, 2020, 1:02 PM

#

@wet crystal you could remove the delay(10); statements in void setup(), but it might take 10 - 20 seconds to connect, congrats on getting it working and happy hunting

#

@wind drift glad you have it figured out!

wind drift May 20, 2020, 1:04 PM

#

just the reconnecting delay is a bit annoying 😄

wet crystal May 20, 2020, 1:10 PM

#

@reef ravine I know it's better to keep the delay because stability

stuck coral May 20, 2020, 1:10 PM

#

@wet crystal I don't know if the ESP8266 is the same, but the ESP32 requires a short delay after you put it in deepsleep, I think so yeild() is called.

wet crystal May 20, 2020, 1:10 PM

#

I thought about uploading without bootloader

reef ravine May 20, 2020, 1:11 PM

#

leave the bootloader, saves many headaches

#

the first delay (though very short) does nothing, the one in while may help, agreed

stuck coral May 20, 2020, 1:13 PM

#

Yeah, sadly Wi-Fi is kinda sucky as far as low power is concerned, connecting to it and staying connected both require a lot of power when you have a tiny battery.

reef ravine May 20, 2020, 1:14 PM

#

and the 8266 is a great way to experiment and learn, coin cells and long life are an advanced topic

wet crystal May 20, 2020, 1:14 PM

#

It takes around 6 seconds until command is executed

reef ravine May 20, 2020, 1:15 PM

#

you are in a hurry 😉

stuck coral May 20, 2020, 1:15 PM

#

Certainly. Not really hating on the choice or the methodology just 6 seconds of radio usage when using a coin cell is quite a power budget.

#

No way to get around it

wet crystal May 20, 2020, 1:16 PM

#

You think it wont make much difference using it without bootloader?

#

I have the ftdi232 here

reef ravine May 20, 2020, 1:17 PM

#

the bootloader is what makes it understand the ftdi connection...

#

otherwise it thinks its a toaster oven on boot

stuck coral May 20, 2020, 1:17 PM

#

Yep, then this will turn into a JTAG learning session if I'm not mistaken

reef ravine May 20, 2020, 1:18 PM

#

it only helps if you are an adavnced coder and if you are running out of memory

wet crystal May 20, 2020, 1:21 PM

#

So the FTDI doesnt upload from ICSP without bootloader?

stuck coral May 20, 2020, 1:22 PM

#

If I remember correctly there is no ICSP interface on the ESP8266, only JTAG but I could be mistaken. The FTDI chip should just be a USB-Serial converter.

wet crystal May 20, 2020, 1:22 PM

#

Okay just heard about JTAG 😄

stuck coral May 20, 2020, 1:23 PM

#

Yeah, this isn't an AVR chip like a ATMEGA8266 or ATTINY where ICSP is very common, with ARM processors it is typically JTAG or SWD for programming and debugging if you don't have a bootloader. Not saying a ARM chip with ICSP is impossible but I don't think I've seen it

wet crystal May 20, 2020, 1:24 PM

#

And much thanks for your help so far, really appreciate it

stuck coral May 20, 2020, 1:24 PM

#

No problem, I'm saftey checking a MAC library line by line and working with a new BLE stack so this is exciting in comparision. Lol

wet crystal May 20, 2020, 1:25 PM

#

So microswitch arrived

#

I hope the thing will be able to put enough tention on it

wet crystal May 20, 2020, 1:50 PM

#

Maybe someone can tell me what happening

#

Actually the esp does turn on again by itself

#

Its still on the USB

#

Could that also be some kind of voltage drop or so usb port shut down, since the load is too small?

stuck coral May 20, 2020, 1:56 PM

#

Hm, the FTDI chip should still be consuming power and enumerating over USB even if the ESP is in deepsleep. The FTDI chip should go to a standby state when USB is unplugged.

wet crystal May 20, 2020, 1:56 PM

#

Oh its still on its dev board

#

I just tried waiting for it to happen again, for like 10 mins now 😄

#

I just put this into the odd casualitys folder

stuck coral May 20, 2020, 1:57 PM

#

Hm, maybe take a wire and solder from the IRQ pin to GND

wet crystal May 20, 2020, 1:58 PM

#

What does affect this?

stuck coral May 20, 2020, 1:58 PM

#

Well if you have a GPIO inturrupt on a floating pin, then the floating pin can trigger the interrupt, it can be very touchy.

wet crystal May 20, 2020, 1:59 PM

#

Ahh okay I understand

stuck coral May 20, 2020, 1:59 PM

#

Pinning it to ground will obviously keep it at 0V

wet crystal May 20, 2020, 2:02 PM

#

https://nettigo.eu/system/images/1956/original.png?1481811503

#

So you mean I should tie RST top left to gnd?

stuck coral May 20, 2020, 2:03 PM

#

No, the inturrupt pin you setup for the deepsleep, the one you left disconnected because you didnt want to wake on a timer.

wet crystal May 20, 2020, 2:03 PM

#

Yeah I guess its the rst

#

According to the tutorial I watched yesterday

stuck coral May 20, 2020, 2:04 PM

#

Holding RST to GND would cause it to never do anything

wet crystal May 20, 2020, 2:05 PM

#

Okay

#

Do I need to tie RST to VCC as well?

stuck coral May 20, 2020, 2:06 PM

#

Hm, I see that with the ESP.deepsleep(0); you are supposed to use RST to wake it back up.... And it should be pulled up in the module but I'm familiar with ESP32 not 8266.

wet crystal May 20, 2020, 2:07 PM

#

Yeah I cannot see an interrupt pin on the image

stuck coral May 20, 2020, 2:08 PM

#

Well you can set other pins to wake from deepsleep in a IRQ, thats why you pass a varilable into .deepSleep();.

wet crystal May 20, 2020, 2:09 PM

#

Oh okay the 0 is supposed to stand for the time how long it should sleep

elder hare May 20, 2020, 2:10 PM

#

what's the name of the "plugin" i can install on Arduino IDE that allows me to see what the crash error was?

stuck coral May 20, 2020, 2:10 PM

#

Ah, I see the ESP8266 is just a totally different beast, you are correct... but the variable is attaching a timer to a pin.... hm. Interesting but ig that works

wet crystal May 20, 2020, 2:11 PM

#

Okay so the chip executed the command again. I started the stopwatch an lets see how long it will take for the next time to happen

#

But I cannot imagine its something else than voltage drop

#

Since im also using a like 3 Meter USB cable

stuck coral May 20, 2020, 2:12 PM

#

Do you have a multi-meter? You are either having a floating RST or a brownout condition. Is your boin cell rechargable?

#

@elder hare for like the ESP32 or in general?

wet crystal May 20, 2020, 2:12 PM

#

No 😄

#

I have multimeter

#

Not sure if the 8266 also has the brownout

stuck coral May 20, 2020, 2:13 PM

#

Hm, but you're using a devboard right? That should be pulling it high.

wet crystal May 20, 2020, 2:13 PM

#

Yeah

stuck coral May 20, 2020, 2:13 PM

#

And I know long USB cables can cause issues, mind trying a short known good cable?

wet crystal May 20, 2020, 2:13 PM

#

Well its a good cable, its just the extension cord

stuck coral May 20, 2020, 2:15 PM

#

Okay, but you said it's 3 meters, long USB cables can cause issues if the USB power implementation device side isn't great, I would just try a short cable to remove that as a possibility

wet crystal May 20, 2020, 2:16 PM

#

Well I do meassure the time now, maybe there is some pattern

marsh charm May 20, 2020, 2:17 PM

#

Heyo, I'm looking to get into Arduino and have pretty solid experience with normal electronics. But I haven't dug into many micro controllers. I want to do things mainly with IOT and the like. Would a regular Arduino be better or an ESP32?

stuck coral May 20, 2020, 2:17 PM

#

Depends on what you're trying to do @marsh charm . And idk @wet crystal, maybe someone with more ESP8266 experience here could chime in

wet crystal May 20, 2020, 2:17 PM

#

Clearly the ESP

#

It has normal arduino functions plus tons of extras

#

And the price ❤️

marsh charm May 20, 2020, 2:18 PM

#

Would it support the majority of libraries?

stuck coral May 20, 2020, 2:18 PM

#

ESP32 if you want something really easy, beginner friendly, and you want Wi-Fi

marsh charm May 20, 2020, 2:19 PM

#

Understood! I'll go get my hands on a handful then, I'd like to create a few sensors that relay data to a MySQL database.

stuck coral May 20, 2020, 2:20 PM

#

Common use case. You might want to check out a InfluxDB + Grafana setup but MySQL is obviously a great tool too and it's better if you want to store more then time series data in one place

marsh charm May 20, 2020, 2:22 PM

#

I already use Grafana, but am way more familiar with MySQL.

#

Right now Grafana is only setup with Prometheus monitoring hardware.

stuck coral May 20, 2020, 2:24 PM

#

Ah, alright. ESP32 has good libraries for doing whatever you need to do Wi-Fi wise and submitting the data to your backend. Whatcha monitoring?

#

It also has two different frameworks to use, either Arduino or IDF, but arduino has IDF functions ported to it

marsh charm May 20, 2020, 2:38 PM

#

I'm monitoring temp/humidity in various parts of a datacenter

#

Plus I'll probably mess around and make a mini greenhouse.

wet crystal May 20, 2020, 2:59 PM

#

FML all out of the sudden the esp doesnt work anymore

stuck coral May 20, 2020, 3:02 PM

#

Very cool @marsh charm. I've been working on a sensor project that will delivery gradiant maps of a greenhouse, fun stuff to play with.

#

Do you happen to have a diagram of your entire setup @wet crystal including the name of the dev board you're using

wet crystal May 20, 2020, 3:03 PM

#

Well I didn´t changed anything

#

Wemos D1 Mini dev board

#

It does get recognized on the USB port, but it wont connect while uploading

stuck coral May 20, 2020, 3:05 PM

#

Do you have a wiring diagram of your setup?

wet crystal May 20, 2020, 3:05 PM

#

There are no wires

#

And nothing connected to the chip

stuck coral May 20, 2020, 3:06 PM

#

Did you have any serial statments in your code or is there a way to verify that GET request is still going out on reset?

wet crystal May 20, 2020, 3:07 PM

#

Nope

#

It does seems to do nothing, no status led flash, even after hitting rst

#

It does show up on the computer, but uploading the code again doesnt work

#

Timed out waiting for packet handler

stuck coral May 20, 2020, 3:09 PM

#

Is there normally a LED flash when you reset the device?

wet crystal May 20, 2020, 3:09 PM

#

No

stuck coral May 20, 2020, 3:09 PM

#

And do you have your multi-meter handy?

wet crystal May 20, 2020, 3:09 PM

#

Yes

stuck coral May 20, 2020, 3:10 PM

#

It does seems to do nothing, no status led flash, even after hitting rst
@wet crystal

#

So what did you mean by the LED here?

wet crystal May 20, 2020, 3:10 PM

#

The blue one on the chip itself

stuck coral May 20, 2020, 3:11 PM

#

Does it normally flash the LED when you hit RST?

wet crystal May 20, 2020, 3:11 PM

#

It does seems to do nothing, no status led flash, even after hitting rst
@wet crystal

stuck coral May 20, 2020, 3:12 PM

#

Just need to make sure because I think you have a reset circuit issue. But you saying that would mean you expect a flash, and then you said no it does not flash a LED when you reset the device normally so Im quite confused

wet crystal May 20, 2020, 3:12 PM

#

It does absolutly nothing

#

No matter what I try

stuck coral May 20, 2020, 3:12 PM

#

Did it before it stopped working?

wet crystal May 20, 2020, 3:13 PM

#

Yes

#

Before it did something

stuck coral May 20, 2020, 3:13 PM

#

OK. Lol. So if you grab your multimeter what voltage is the RST pin at?

wet crystal May 20, 2020, 3:16 PM

#

Guess what

#

It just decided to work again

stuck coral May 20, 2020, 3:16 PM

#

I think you have a physical reset circuit problem

wet crystal May 20, 2020, 3:16 PM

#

2.9v on RST

stuck coral May 20, 2020, 3:17 PM

#

Should be 3.3V, what is the output from the 3.3V pin?

wet crystal May 20, 2020, 3:17 PM

#

3.2

#

But yeah seems reasonable

#

Lets try what happens when the esp is from the board

stuck coral May 20, 2020, 3:19 PM

#

Hm. That could all be fine but there are two transistors in the reset circuit used for programming that Im concerned about

wet crystal May 20, 2020, 3:21 PM

#

Drivers here are so crazy

#

Firefighters does honk while sirene is running

#

Since they would have issues otherwise

#

Super annoying 😄

stuck coral May 20, 2020, 3:22 PM

#

Intersections kill firemen sadly.

#

And people not paying attention

wet crystal May 20, 2020, 3:23 PM

#

Yeah sry for going offtopic, they just passed my window

stuck coral May 20, 2020, 3:24 PM

#

idc. I like firetrucks, I grew up around the firestation. Lol

wet crystal May 20, 2020, 3:25 PM

#

So esp is mixed with low melt solder

#

Should I go around it with the iron or use the heat gun?

stuck coral May 20, 2020, 3:26 PM

#

Hm.... I think you have a solder joint out but it would be a transistor, one of the resistors connected to the transistor, or the FTDI IC

wet crystal May 20, 2020, 3:26 PM

#

Ahh no I want to unsolder the whole chip from the dev bnoard

stuck coral May 20, 2020, 3:27 PM

#

Ah okay, then ig, heat gun can damage it but it's probably your only option

wet crystal May 20, 2020, 3:30 PM

#

Okay its off

stuck coral May 20, 2020, 3:30 PM

#

👏🏻

#

Hm, is that a clap or praying? whoops

wet crystal May 20, 2020, 3:30 PM

#

Looks like clap

#

🙏

#

Thats pray

stuck coral May 20, 2020, 3:30 PM

#

Alright, fantastic

wet crystal May 20, 2020, 3:32 PM

#

Okay, now I clean up the solder pads and than looking further 😄

#

Are there any other pins besides EN and RST that needs to be tied to vcc/gnd?

stuck coral May 20, 2020, 3:39 PM

#

With the ESP pins like GPIO0 are OK floating but I dont know enough about the 8266 to give a good answer

wet crystal May 20, 2020, 3:39 PM

#

Okay

#

What resistor should I pick to tie those both pins?

#

Or none?

stuck coral May 20, 2020, 3:41 PM

#

10K

#

None would probably work, but pull ups tend to be 10K

wet crystal May 20, 2020, 3:41 PM

#

One for both is okay I think?

stuck coral May 20, 2020, 3:42 PM

#

Yes

wet crystal May 20, 2020, 3:42 PM

#

kk thx

cedar mountain May 20, 2020, 3:43 PM

#

Hang on. Pins need to have separate pull-up resistors. Otherwise you're connecting the pins together too.

stuck coral May 20, 2020, 3:43 PM

#

They're pulling two pins up, one for both is right.

cedar mountain May 20, 2020, 3:45 PM

#

Perhaps I'm misunderstanding. One end of the resistor is on +V. The other end of the resistor is... connected to both pins together?

stuck coral May 20, 2020, 3:45 PM

#

No, one resistor goes to each pin, commonly connecting to VCC

#

I think of us misread

cedar mountain May 20, 2020, 3:45 PM

#

Gotcha. I agree... just confusion about what "one for both" meant.

stuck coral May 20, 2020, 3:46 PM

#

Understood 👌🏻 Good catch if it was happening

flint smelt May 20, 2020, 3:48 PM

#

I picked up a PyGamer on digikey and it arrived today! I'm about to have some fun!

stuck coral May 20, 2020, 3:49 PM

#

Sweet, enjoy the SAMD51 if you havnt used one before

flint smelt May 20, 2020, 3:59 PM

#

I'm swimming in them, I love them

wet crystal May 20, 2020, 4:10 PM

#

😂

📎 IMG_20200520_180957.jpg

stuck coral May 20, 2020, 4:10 PM

#

Oh, @cedar mountain I guess it was me who misread

#

@wet crystal Two pins cannot share a resistor

wet crystal May 20, 2020, 4:10 PM

#

...

#

Even if they both needs to get pulled high?

stuck coral May 20, 2020, 4:11 PM

#

Yep

wet crystal May 20, 2020, 4:13 PM

#

Well guess its time for the 2mm tht solder breadboard than

elder hare May 20, 2020, 5:02 PM

#

when i call "MYINFO->SetDeviceNumLEDS(24);" from here -> https://hastebin.com/ulokeyapot.cpp

i get this

Exception 29: StoreProhibited: A store referenced a page mapped with an attribute that does not permit stores
PC: 0x40201612: setup() at C:\Users\Krist\AppData\Local\Temp\arduino_build_261466\sketch/MYINFO.h line 23
EXCVADDR: 0x00000000

why?

wet crystal May 20, 2020, 5:07 PM

#

https://tenor.com/view/movie-one-eternity-later-gif-7900643

Tenor

#

📎 IMG_20200520_190805.jpg

stuck coral May 20, 2020, 5:12 PM

#

Very neat @wet crystal

#

Are you initalizing your class @elder hare?

elder hare May 20, 2020, 5:15 PM

#

from what i can read on google im out of heap memory 😐 w00t

stuck coral May 20, 2020, 5:15 PM

#

I think you have a pointer to nowhere, but that could be

elder hare May 20, 2020, 5:17 PM

#

the pointer is correct :/

#

looks like out of heap memory

flint smelt May 20, 2020, 5:17 PM

#

@elder hare did you try downloading more?

elder hare May 20, 2020, 5:18 PM

#

@flint smelt what? 😆

wet crystal May 20, 2020, 5:18 PM

#

https://downloadram.net/

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Both work. I got now 128gb of RAM on my phone 😄

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When your pcb gets hold together by pure willpower

📎 IMG_20200520_192715.jpg

stuck coral May 20, 2020, 5:28 PM

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Spit, gafa tape and medical tubing

wet crystal May 20, 2020, 5:28 PM

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Pfff

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Hotglue

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Not lets find out it its still work

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Well I think I should try out with a constant voltage source first

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😄

austere bloom May 20, 2020, 7:50 PM

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How do I run multiple sections of code simultaneously?

stuck coral May 20, 2020, 7:53 PM

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Well it depends on what you mean, multitasking or parallelism @austere bloom?

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If you mean actually at the same time in parallel, then you need a multi-core CPU

austere bloom May 20, 2020, 8:07 PM

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Well. My specific scenario is to have a function which changes a variable's value every 1000ms and a different function which reads the output of a motion sensor

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Can I do that with just 'multitasking'?

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nvm I just googled a bit more and the answer is no 😦

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I guess I will have to try something software side

stuck coral May 20, 2020, 8:14 PM

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Oh, you need a timer interrupt

cedar mountain May 20, 2020, 8:14 PM

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Yeah, you don't really have to do that simultaneously, per se, just do a little processing of each at a time. Read the sensor, check the time and maybe change the variable, read the sensor again, etc.

stuck coral May 20, 2020, 8:15 PM

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Setup a timer to count until 1000ms, and call a funtion to change the variable on that timer, then when you're done reset the timer and then start reading and printing the motion sensor code

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Actually I agree more with @cedar mountain just millis() and a IF statment

runic lava May 20, 2020, 10:04 PM

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can i also get help with code here