Unknow problem with an Arduino Micro program

Projects Programming
1

My code:

#include "Keyboard.h"

// Options
#define LED_PIN 4
#define BUTTON_PIN 2 
#define BUTTON_PIN_SUPORTE 3 


void setup() {
  // Apagar LEDS RX e TX
  pinMode(LED_BUILTIN_TX,INPUT);
  pinMode(LED_BUILTIN_RX,INPUT);

  // Configura PIN para LED
  pinMode(LED_PIN, OUTPUT);

  // make pin 2 an input and turn on the pull-up resistor
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(BUTTON_PIN_SUPORTE, INPUT_PULLUP);


  // setup HID
  Keyboard.begin();
  Serial.begin(9600);
}



void loop() {
  Serial.println (digitalRead(BUTTON_PIN_SUPORTE));
  delay(100);
}

The problem:
If I coment the line pinMode(LED_PIN, OUTPUT); serial return 1

If I include that line serial return 0.

I dont know about that. Someone can explain this.

2

Please put your code in code tags per the sticky at the top of the forum. The forum software screws up your formatting without the tags.

1 Like
3

Try forming your question a bit better. Tell us what you expect and what your getting. Then tell us what you tried and the results. Remember we may be in the other room or 1/2 way around the globe from you but regardless we cannot see what you can.

4

Check your wiring.
It seems that pin 3 is shortcut to pin 4 or the button is missing a GND wire.

5

That simple program just get signal from BUTTON_PIN_SUPORTE (input button) and return your value in serial.

BUTTON_PIN_SUPORTE linked in Pin 3 port as a input signal.

Pin 3 has a button.

Button ON -> Pin 3 = GND
Button OFF -> Pin 3 = OPEN

6

Your board is faulty or you connected something wrong

7

The most likely explanation is that Pin 3 and Pin 4 are shorted together. Try adding 'digitalWrite(LED_PIN, HIGH);' to see if it makes the input from Pin 3 change to HIGH. That would tend to prove the short circuit.

8 
void loop() {
  digitalWrite(LED_PIN, HIGH);
  Serial.println (digitalRead(BUTTON_PIN_SUPORTE));
  delay(100);
}

or

void loop() {
  digitalWrite(LED_PIN, LOW);
  Serial.println (digitalRead(BUTTON_PIN_SUPORTE));
  delay(100);
}

Serial Return 1

If I try to change Botton in Pin 3 return this:

Button ON -> Pin 3 = GND Return 0
Button OFF -> Pin 3 = OPEN Return 1

9

Looks like all working as it should, what is your expectation?

10

I did some tests with another board and it is working.

This board has a problem.

There doesn't seem to be a direct short circuit between the pins. Maybe some problems with the electrical tracks.

I couldn't find the problem. The board is out of use.

Thanks for help.

11

Hi,

What board????

Thanks.... Tom.. :smiley: :+1: :coffee: :australia:

12

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