Unable to Write to Digital Pins

Projects Programming
1

I'm sure it must be me doing something wrong. But for the life of me I can't write to a digital pin (except the Built in LED.

I'm using a Nano and I'm new to the Ardunio IDE. I've built upon the basic Blink application. The code below, runs and flashes the LED. I know the code is running as I can change the delay length in the code and it changes on the board. I know the pins aren’t’ changing their level as I’m looking at it on a scope/logic analyser.

void setup()
{
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(32, OUTPUT);
  pinMode(1, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(15, OUTPUT);
}

// the loop function runs over and over again forever
void loop()
{
  digitalWrite(LED_BUILTIN, HIGH);
  digitalWrite(32, HIGH);
  digitalWrite(1, HIGH);
  digitalWrite(15, HIGH);
  digitalWrite(16, HIGH);
  delay(200);
  digitalWrite(LED_BUILTIN, LOW);
  digitalWrite(32, LOW);
  digitalWrite(1, LOW);
  digitalWrite(15, LOW);
  digitalWrite(16, LOW);
  delay(200);
}

I've tried subsitutue the pin numbers for the pin names (PB4, PB3 etc..) but that doesn't work.

Is there something obvious that I'm missing?

2

I'm using a Nano

  pinMode(32, OUTPUT);

How many pins does a Nano have?

void loop()
{
  while (1)
  {

loop() loops. Ditch the stupid while statement.

I know the pins aren't' changing their level as I'm looking at it on a scope/logic analyser.

I would suspect that you don't have the scope/logic analyzer connected correctly, then.

Connect an LED, with currently limiting resistor, between the output pin and ground. Does the LED flash?

3 
  pinMode(32, OUTPUT);

Which pin should that be on a Nano?

  pinMode(1, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(15, OUTPUT);

You checked TX(1), A1(15) and A2(16) ?

4

But for the life of me I can't write to a digital pin (except the Built in LED.

Are you by any chance trying to use the chip pin numbers rather than the pin numbers printed on the Nano ?

5

PaulS:

  pinMode(32, OUTPUT);

How many pins does a Nano have?

32 - Pin 32 is (or should be) D2 or PD3

PaulS:

void loop()

{
  while (1)
  {



loop() loops. Ditch the stupid while statement.

PaulS:
Yep - i left the while (1) loop in unintentionally as I was experimenting with soem other stuff. In the above example - I agree it's pointless.

I would suspect that you don't have the scope/logic analyzer connected correctly, then.

Connect an LED, with currently limiting resistor, between the output pin and ground. Does the LED flash?

I'll try

6

pinMode, digitalWrite and co., take as parameter the pin labels written on the board. there is no pin 1 or 30

7

Juraj:
pinMode, digitalWrite and co., take as parameter the pin labels written on the board. there is no pin 1 or 30

On a Nano there is a pin 1, pin numbers go from 0 to 20, 19 and 20 are analog input only.

8

Juraj:
pinMode, digitalWrite and co., take as parameter the pin labels written on the board. there is no pin 1 or 30

Ah ha - that's what I'm doing wrong then

9

Whandall:
On a Nano there is a pin 1, pin numbers go from 0 to 20, 19 and 20 are analog input only.

as label on the board?

10

As parameters of pinMode etc. as you know.