ATTiny85 and 3 pin change interrupts

Projects Programming
4

Ok!

#include <avr/interrupt.h>
//Choose where your buttons are:
#define regist PCINT0_vect//All pins on Attiny85 :)

#define bttnA 0
#define bttnB 1
#define bttnC 2
 
ISR (regist){
  if(digitalRead(bttnA)){
    //A pressed!
  }else if(digitalRead(bttnB)){
    //B pressed!
  }else if(digitalRead(bttnC)){
    //C pressed!
  }
}
void setup() {  
  pinMode(bttnA,INPUT);
  pinMode(bttnB,INPUT);
  pinMode(bttnC,INPUT);
  //Are you using internal pullups? Uncomment these!
//  digitalWrite(bttnA,HIGH);
//  digitalWrite(bttnB,HIGH);
//  digitalWrite(bttnC,HIGH);
 
// enable interrupt for pins...
  GIMSK = 0b00100000;    // turns on pin change interrupts
  PCMSK = 0b00000111; //On pins 0,1,& 2
}
 
 
void loop() {
  // Nothing needed
}

This will use buttons on pins 0,1,& 2, listen for a change, and then run code accordingly!