#ARDUINO MEGA 2560 PIN INTERRUPT PINS FULL#

The same logic has not been carried across to the ATMega32u4 Based leonardo. The Arduino team have hidden some of the differences between the ATMega328 and ATM2560 so that attaching INT0 using the attachInterrupt function will attach an interrupt to digital pin 2 on both chips even though on the Mega digital pin2 is actually INT4. The external interrupts are associated with specific digital pins on each chip type, the following table taken from the attachInterrupt reference page lists the available external interrupts and the associated Arduino pin on each chip. The underlying chip in your Arduino supports a second type of interrupt however these interrupts are not directly supported by Arduino and need to be accessed through an additional library. If we want to access more interrupts we need to look at the next type. The disadvantage is that there are a limited number available on each chip type. These are flexible easy to use interrupts which can be triggered by rising, falling or changing signals. The 8-bitArduino boards are based on one of three related chips -Įach of these chips supports two types of interrupts.

#ARDUINO MEGA 2560 PIN INTERRUPT PINS FULL#

Based on this information we can modify sketches to run on the full range of 8-bit Arduinos.

The following post examines the differences in interrupts between the popular boards, the Arduino UNO, Micro, Mega, Mini and Leonardo. If you have ever tried to port an Arduino project that uses interrupts from one board type to another, you have probably experienced frustration, this includes the sample code throughout RCArduino.

Arduino mega 2560 pin interrupt pins