#define TIMER_US 100000 // 100mS set timer duration in microseconds #include // Header file for TimerOne library Note: Download and rename to remove the hyphen before installing. Requires the TimerOne library downloadable from LED D1 will flash every 4 seconds and LED D2 will flash 5 times a second Load the sketch onto your Arduino Uno and let it run. This demonstration is based on The ATmega328's Timer 1 so you should download and install the TimerOne library as below.Ĭopy and paste the Arduino interrupt demo sketch below This would have been an interesting exercise but it isn't really what this guide is all about and there is a convenient code library available that does just what we need. It is perfectly possible to write code that directly interfaces with the hardware including the internal ATmega328 timers on the Arduino. Things you need to play with timer interruptsīuy an Arduino Uno now and start building smart electronics projectsĭownload and install the Arduino Timer One library Provide accurate timing in conjunction with hardware timers.Free up your main loop for other things instead of sitting in delay functions.Provide a fast response to external inputs and user interface.In general most tasks can be accomplished without resorting to interrupts but if you do then the use of interrupt service routines can clean up your code and add another dimension to your programmes. Why use interrupts in your Arduino projects It is true that interrupt use can lead to unpredictable code behaviour that is difficult to debug but they can also greatly enhance your projects if you follow a few simple rules. That is interrupts that are allowed to interrupt themselves. Not only will I show you how to get a regular timed interrupt to work but I will also demonstrate the advantages of reentrant routines. I'm going to show you how you can take advantage of internal timer interrupts on the Arduino using a couple of LED's and a simple code sketch. Most of these sketches or programmes concentrate on getting the job done in the main loop() function and rarely venture into the world of interrupts. There are countless examples of Arduino sketches on the Internet covering all but the most obscure and complicated projects.
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