frosty kernel
Having issues with the RMP I am producing. I have made the board but it just simply doesnt work. I'm getting nothing out of the Input Multiplexer (CD74HC4067M96) and the LED Drivers are not putting out any voltage on the output pins. I have pictures of the schematic
void surge
Pins A6 and A7 on a Nano are only for analog input. Nothing else.
Does Mobiflight allow you to specify those two pins? It should not.
After further investigation, Mobiflight will erroneously allow those two pins to be specified for digital input and output.
Please use them only for analog input. This is a hardware limitation.
frosty kernel
Ah bugger. So pretty much those 2 pins cant be used for digital input
Mobiflight allow me to pick those pins
void surge
Mobiflight allow me to pick those pins
Correct
frosty kernel
No worries. With the Multiplexer, do i need to feed the buttons with +#V for the multiplexer to work. I can't really find any definitive circuit diagrams. As in
+5v----Button----multiplexer
Or do i need to
+5v----resistor----button----multiplexer
void surge
No
Mux --- button --- GND
You may or may not need a pull up resistor across the signal pin and the Vcc pin.
It can't hurt to include it.
How many leds do you have? Why two led drivers?
frosty kernel
How many leds do you have? Why two led drivers?
Ones for the backlights of the buttons and the other is for the annunicator leds.
void surge
If short on Arduino pins, didn't you consider daisy chaining the led drivers?
You can chain up to 32 bits.
frosty kernel
I've done that with the new schematic once someone pointed out that the led's should be driven with +V and not go to gnd
void surge
Using a led driver for backlight leds seems like overkill too.
frosty kernel
so its free'd up 2 or 3 pins
frosty kernel
Using a led driver for backlight leds seems like overkill too.
I went that way because I could drive the led's individually without the need for an external power supply
And from the designs that are on the mobiflight/panels page they do that but have a +12v ext power input as well
void surge
The 12v supply is to be able to drive 3 leds in series. You can use 5v to drive one led.
Wire them all in parallel instead, all controlled by one arduino pin driving one transistor.
frosty kernel
ah ok. i sort of get what you mean.