An example using one of the Arduino Hardware timers

Circuit Layout for Timer1 Examples

Timer1 Example 1

Timer1 Example 1 (Video)

Timer1 Example 1 (code)

	/* This example employs Timer1 to blink one of three LEDs. The timer is initialized and called
	during the setup() function which repeatedly calls a function that alternately flashes the
	other two LEDs. The timer function continues without interruption when the loop operates.
	*/
	#include <TimerOne.h>
	// This example uses the timer interrupt to blink an LED
	// This allows the main program to do "other stuff"
	const int blinkLed = 7; // the pin with a LED that should blink
	const int buttonLed1 = 5; // led controlled by button
	int blinkState = LOW;
	int buttonPin = 2;
	boolean buttonVal = 1;
	void setup(void)
	{
	pinMode(blinkLed, OUTPUT);
	pinMode(buttonLed1, OUTPUT);
	pinMode(buttonPin, INPUT_PULLUP);
	Timer1.initialize(150000);
	Timer1.attachInterrupt(blinkLED); // blinkLED to run every 0.15 seconds
	}
	// The main program controls an LED attached to a button
	void loop(void){
	buttonVal = digitalRead(buttonPin);
	if(buttonVal == 0){
	digitalWrite(buttonLed1, HIGH);
	delay(2000);
	}
	else{digitalWrite(buttonLed1, LOW);}
	}
	void blinkLED(void)
	{
	if (blinkState == LOW) {
	blinkState = HIGH;
	} else {
	blinkState = LOW;
	}
	digitalWrite(blinkLed, blinkState);
	}

view raw Timer1 Example A hosted with ❤ by GitHub

Timer1 Example 2 

Timer1 Example 2 (Video)



Timer1 Example 2 (code)

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Timer1 Example 3

Timer1 Example 3 (video)



Timer1 Example 3 (code)

	/* This example employs Timer1 to blink one of three LEDs. The timer is called
	within a For Loop which repeatedly calls a function that alternately flashes the
	other two LEDs. The timer is "turned on" runs for a specified portion of the For Loop
	and is then "turned off".
	*/
	#include <TimerOne.h>
	const int blinkLed = 3; // the pin with a LED that should blink
	const int buttonLed1 = 4; // led controlled by button
	const int buttonLed2 = 5; // led controlled by button
	const int buttonPin = 2; // button
	int blinkState = LOW;
	boolean buttonVal = 1;
	void setup()
	{
	pinMode(blinkLed, OUTPUT);
	pinMode(buttonLed1, OUTPUT);
	pinMode(buttonLed2, OUTPUT);
	pinMode(buttonPin, INPUT_PULLUP);
	Timer1.initialize(100000); // timer period set to 10,000 us = 100 ms = 0.1 s
	}
	// The main program controls an LED attached to a button
	// The two Timer1 calls show how the interrupt can be paused from a call within the loop
	void loop()
	{
	buttonVal = digitalRead(buttonPin);
	if(buttonVal == 0){ // begin if button push has been detected
	for(int i=1; i<20; i++){
	// set beginning and ending conditions for timer function
	if(i == 5){Timer1.attachInterrupt(blinkLED);}
	if(i == 15){
	Timer1.stop();
	digitalWrite(blinkLed,LOW);
	}
	// flash the other two LED's
	flashLEDs();
	}
	}
	digitalWrite(buttonLed2,LOW); // Turn off the LED that is still on at end of For Loop
	}
	void blinkLED()
	{
	if (blinkState == LOW) {
	blinkState = HIGH;
	} else {
	blinkState = LOW;
	}
	digitalWrite(blinkLed, blinkState);
	}
	void flashLEDs(){
	digitalWrite(buttonLed1, HIGH);
	digitalWrite(buttonLed2, LOW);
	delay(100);
	digitalWrite(buttonLed1, LOW);
	digitalWrite(buttonLed2, HIGH);
	delay(100);
	}

view raw Timer1 Example B hosted with ❤ by GitHub

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