AnalogRead and the interrupt pins

analogRead_and_the_interrupt_pins.ino

/*
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read more about this gist here: https://medium.com/@saphidev/analogread-and-the-interrupt-pins-f9c986d3fc0e
-------------------
*/


#define LED 13 //optionel
#define BTN A5 //ADC5
#define INTRPT 2 //PD2 refer to the INT0 vector


void setup(){
  Serial.begin(9600);
  
  pinMode(LED,OUTPUT);
  pinMode(INTRPT,INPUT_PULLUP);
  pinMode(BTN,INPUT_PULLUP);
  //digitalPinToInterrupt(INTRPT) or INT0
  //toggle is our ISR function
  //FALLING: when the pin goes from HIGH to LOW
  attachInterrupt(digitalPinToInterrupt(INTRPT),toggle,FALLING);
  
  
}

void toggle(){
  
  //delay to give the ADC a time to correct its value
  delay(10);
  
  
  Serial.print("value: ");
  short v = analogRead(BTN);
  Serial.println(v);
  if(v > V1-10 && v < V1 + 10){
  //... button 1 pushed
  }else if(v > V2-10 && v < V2 + 10){
  //... button 2 pushed
  }else if(v > V3-10 && v < V3 + 10){
  //... button 3 pushed
  }

}