MsTimer2 is a small and very easy to use library to interface Timer2 with humans. It's called MsTimer2 because it "hardcodes" a resolution of 1 millisecond on timer2.

Updated again:

• a new version is available here

UPDATED:

• works on ATmega1280 (thanks to Manuel Negri).
• works on ATmega328 (thanks Jerome Despatis).
• works on ATmega48/88/168 and ATmega128/8.

Methods

MsTimer2::set(unsigned long ms, void (*f)())

this function sets a time on ms for the overflow. Each overflow, "f" will be called. "f" has to be declared void with no parameters.

MsTimer2::start()

enables the interrupt.

MsTimer2::stop()

disables the interrupt.

Source code

License: LGPL

MsTimer2.zip

Install it on {arduino-path}/libraries/

Example

// Toggle LED on pin 13 each second
#include <MsTimer2.h>

void flash() {
  static boolean output = HIGH;

  digitalWrite(13, output);
  output = !output;
}

void setup() {
  pinMode(13, OUTPUT);

  MsTimer2::set(500, flash); // 500ms period
  MsTimer2::start();
}

void loop() {
}

Further examples on the Web

• Heartbeat effect for Arduino and 20 LEDs
• Knight Rider example
• Persistence of vision sketch
• Power grid monitoring experiment
• Lighthouses

Bugs

send any bug to javiervalencia80 [at] gmail.com