HC05 motor

[cunning ridge]

@tacit mesa

Are these connections soldered or are the jumpers just poked into the hole?

[tacit mesa]

just poked right now

[cunning ridge]

that won't work well

or at all

[tacit mesa]

ok...ill solder them right now and test

[cunning ridge]

solder a pin there and use a female jumper, or solder the end of the jumper

is there are connector block on the other side?

[tacit mesa]

yeah ill solder the head of the jumper to the holes

[cunning ridge]

or is it just a bare pad hole?

[tacit mesa]

This is the other side

[cunning ridge]

yeah, that won't be satisfactory

[tacit mesa]

ok..ill solder

i can solder the VCC to 5v
GND to GND
RXD of Hc 05 to pin 13
and TXD of Hc 05 to pin 2?...according to the code?

[cunning ridge]

that looks right: SoftwareSerial mySerial (rxPin, txPin); according to the doc

rx and tx are on the arduino side, so they are reversed on the HC05. And you said it was receiving commands, so that looks OK.

the pins may not be THE problem, but they are A problem

but your program is pretty simple, i don't see anything wrong with it. If it's printing out the received single character commands then I suspect some issue with the motor dirver or something. How are you powering the motors?

[tacit mesa]

3 3.7 li ion batteris

[cunning ridge]

in series? what voltage are the motors? could you point to a product link for the motor control board?

if you disconnect some of the motors, does it work better (for the motors that are still connected)?

[tacit mesa]

in series

3.7 vols each

[cunning ridge]

i'm confused: are they 12v motors or 5v motors or something else?

what is their "working voltage"

[tacit mesa]

https://iotwebplanet.com/product/l293d-motor-driver-servo-shield-for-arduino/
https://iotwebplanet.com/?s=Bo+motor&post_type=product

these are the prodect link

[tacit mesa]

3-6v DC

[cunning ridge]

so the batteries should NOT be in series. And it's dangerous to put lipo batteries in parallel unless they are carefully matched

[tacit mesa]

ok. i should connect them in parallel?

[cunning ridge]

NO, don't do that, just try one at time. 7.4V is too high for the motors

[tacit mesa]

okk

[cunning ridge]

we have a guide for a similar shield

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

similar motor: https://www.adafruit.com/product/3777

did you really have 3.7V+3.7V+3.7V in series?

so it measured like 11.1V?

I will be off in a couple of minutes, sorry

[tacit mesa]

yeahh

[tacit mesa]

ok thank you for your help

[cunning ridge]

that voltage is too high for those motors, sorry

3-6V only

maybe it stopped working because something heated up in the motor or on the motor board, so just try one battery

[tacit mesa]

i thought the motor driver gives out like 5V

[tacit mesa]

okk

[cunning ridge]

the board doesn't convert the power. Were you supplying 11.1V to the barrel jack on the Arduino? The motor board takes an external supply. See https://learn.adafruit.com/adafruit-motor-shield-v2-for-arduino/powering-motors#setting-up-your-shield-for-powering-dc-and-stepper-motors-2045947
quote:

Don't connect the motor power supply to the Arduino's 5V power pin.

that page will give you some help about powering the motor board

[tacit mesa]

ok

[cunning ridge]

I'm not sure how well it will work at 3.7V, but you can try. It normally expects >=5V

[tacit mesa]

i connected the batteries to the motor driver..not the srduino

[cunning ridge]

I have built a robot with similar motors. I powered it with 3 or 4 AA batteries. I didn't try a LiPo for the motor battery. But that was years ago

99% of 'weird motor problems' are due to noise on the power line from sharing power supplies and/or not having a powerful enough supply! Even small DC motors can draw up to 3 Amps when they stall.
another quote from that page

[tacit mesa]

ill read that..yeah

[tacit mesa]

ill try it on one liPo

[tacit mesa]

Okk...everythings working

i just need to connect the servo and the ultrasonic sensor

for auto braking

[cunning ridge]

yay!