#include <TimerThree.h>

TimerThree t1;

void setup(){

    Serial.println("Timer test @ 1 second");
    Serial.begin(9600);
    t1.initialize(2000000);
    t1.attachInterrupt(callback);

}

void callback(){
  printstuff();
}

void loop(){
  Serial.print("one second delay loop");
  delay(1000);
}

void printstuff(){
  Serial.print("timer interrupt triggered ");
}