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PinChangeInt Example

This code counts the number of times pin 15 (aka Analog 1) changes state and prints the count when it recives a p on the serial port.

  1. /*
  2. Copyright 2011 Lex.V.Talionis at gmail
  3. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  4. */
  5. #include <PinChangeInt.h>
  6. #include <PinChangeIntConfig.h>
  7.  
  8. #define PIN 15  // the pin we are interested in
  9. volatile byte burp=0;    // a counter to see how many times the pin has changed
  10. byte cmd=0;     // a place to put our serial data
  11.  
  12. void setup() {
  13.   Serial.begin(9600);
  14.   Serial.print("PinChangeInt test on pin ");
  15.   Serial.print(PIN);
  16.   Serial.println();
  17.   pinMode(PIN, INPUT);     //set the pin to input
  18.   digitalWrite(PIN, HIGH); //use the internal pullup resistor
  19.   PCintPort::attachInterrupt(PIN, burpcount,RISING); // attach a PinChange Interrupt to our pin on the rising edge
  20. // (RISING, FALLING and CHANGE all work with this library)
  21. // and execute the function burpcount when that pin changes
  22.   }
  23.  
  24. void loop() {
  25.   cmd=Serial.read();  
  26.   if (cmd=='p')
  27.   {
  28.     Serial.print("burpcount:\t");
  29.     Serial.println(burp, DEC);
  30.   }
  31.   cmd=0;
  32. }
  33.  
  34. void burpcount()
  35. {
  36.   burp++;
  37. }