Question

In C, if you are using interrupts for when a button is pressed, how would you use the value you stored in interrupt 1 when (button 1 was pressed) to interrupt 2 when (button 2 was pressed)?

example,

If I press button 1, and the value I have is 5. How would I transfer the value (v = 5) in interrupt 1 to interrupt 2 when I press the button 2 to place in an equation T = 26 + v and then take the value of T and transfer it to interrupt 1 when I press button 1.

Answer 1

Lets see the answer :-

Lets see program :-

const byte ledPin = 1;
const byte interruptPin = 2;
volatile byte state = LOW;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), blink1, CHANGE);
}

void loop() {
  digitalWrite(ledPin, state);
}

void blink1() {
state = !state;
}

From the first line, we can see that by setting the appropriate value of button numbers, and associtating related interrupting fuctions we can achieve the said functionality.