Polling for Push Button

Using Arduino Programming Questions
1

Hello Friends,

I have performed an experiment on Simple waveform Generator.
Please refer follwing link:

I have come across a problem of Button Debouncing and I modified the waveform code. I successfully implemented it using interrupt function. Now I have to used Polling mechanism without attachInterrupt Function. Is there any sample code for beginner to understand Polling. I know the concept of Polling but I need some example to understand it more properly.

Thanks In advance

2

The loop() function gives you the repetetive execution and a simple if can perform your test.

const byte pinToPoll = LED_BUILTIN;

void setup() {}

void loop()
{
  if (digitalRead(pinToPoll)) {
    // react
  }
}
3

Sample code to poll multiple inputs

const byte buttonPins[] = {A1, A2, A3};  //buttons attached to these pins

void setup()
{
  Serial.begin(115200);

  for (int x = 0; x < 3; x++)
  {
    pinMode(buttonPins[x], INPUT_PULLUP);  //set button pins as inputs
  }
}

void loop()
{
  for (int x = 0; x < 3; x++)
  {
    if (digitalRead(buttonPins[x]) == LOW)
    {
      Serial.print("The button on pin ");
      Serial.print(buttonPins[x]);
      Serial.println(" is pressed");
    }
  }
}

Note that I used analogue inputs in the code because that is what my test system is set up to do but the principle will work with any pins.

4

Thanks a lot Whandall and UKHeliBob for your help.