Arduino Nano : IDE cannot set pins D20 (A6) and D21 (A7) with pinMode

[rajivtctech]

I had an application which used all the pins of a Nano. I could not get a digital output on A6 and A7 which I had set with

#define onePin 20
#define anotherPin 21

void setup(){
pinMode(onePin, OUTPUT);
pinMode(anotherPin, OUTPUT);
}
etc...
The IDE reports no error but
digitalWrite(onePin, HIGH);
or
digitalWrite(anotherPin, HIGH);
does absolutely nothing.

It all works up to D19 (A5). Not with A6 or A7.

Rajiv

[matthijskooijman]

These pins are a bit weird - they are analog only. There is no digital circuitry present in the 328p chip for them. If you check out the datasheet, you'll see these pins are listed as "ADC6" and "ADC7" only, as opposed to other pins like "PC0 (ADC0/PCINT8)".

[rajivtctech]

Thank you for the prompt response! I thought this was a bug in the hardware configuration files... Thank you. Rajiv

…

On May 17, 2017 17:28, "Matthijs Kooijman" ***@***.***> wrote: These pins are a bit weird - they are analog only. There is no digital circuitry present in the 328p chip for them. If you check out the datasheet, you'll see these pins are listed as "ADC6" and "ADC7" only, as opposed to other pins like "PC0 (ADC0/PCINT8)". — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#6297 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AbbF7sJuO4cjFgJBokbePYk2eWkGE5_Fks5r6uDZgaJpZM4NdwDh> .