#Pin change interrupt arduino mega 2560 how to
#Pin change interrupt arduino mega 2560 code

#Pin change interrupt arduino mega 2560 code

It's up to your code to then read the whole port and determine which bit(s) have changed from the last time you read the port. The arduino IDE doesn't support it directly but there is a library available to help use them easier.īasically every digital pin 'belongs' to one of the 8 bit PORTS and a pinchange interrupts tells the system that at least one of the pins of a port has changed. So Im trying to make what I thought would be a simple project.

#Pin change interrupt arduino mega 2560 how to

PinChangeInterrupts are different than normal Interrupts. Solved Pin Change Interrupts on the Arduino Mega 2560 grantastley November 3, 2015, 10:47am 1 Hi I am trying to learn how to use the Pin Change Interrupts. PinChangeInterrupt library with a resource friendly implementation (API and LowLevel). Note that you still have to be careful which pins you choose. These are harder to work with since they are grouped into sets of pins that share the same interrupt, but there are far more pins with this kind of interrupt available. Yes, any digital input pin can be used to generate an interrupt via the pinchange interrupt mode. A simple & compact PinChangeInterrupt library for Arduino. However there is a different interrupt system that may help you out - the pin change interrupts. Is there any way I can assign 2 more pins (aside from the predetermined 6 on the Mega)? This requires an external library which has its own way of interfacing with them (see the examples). Many pins (including the analog pins) can use the pin change interrupt. In that digitalPinToInterrupt () macro, replace the NOTANINTERRUPT with something like: Replace the 6 and 7 with whatever interrupt numbers you need. I'm in need of 8 interrupt pins to read channels A & B of four motors and do not want to invest in the DUE (since any of it's pins can allegedly be used for interrupts), as there seems to still be a lot of confusion in using it since it's relatively new. These pins can be configured to trigger an interrupt on a low level, a rising or falling edge, or a change in level. From your pins file, it looks like PE6 and PE7 are pin numbers 83 and 84.