![]() These map approximately to pins 10 through 15, 50 through 53, and A6 through A15 (although part of port J is unmapped to Arduino pins, therefore PCINT11 through PCINT15 are unavailable on the Arduino Mega/Mega 2560). You can define a routine using a special function. On the ATmega1280/2560, only ports B, J, F, and K have pin change interrupt capability. The Arduino Mega has six hardware interrupts including the additional interrupts ('interrupt2' through 'interrupt5') on pins 21, 20, 19, and 18. I really don't get how they implemented this. Most Arduino designs have two hardware interrupts (referred to as 'interrupt0' and 'interrupt1') hard-wired to digital I/O pins 2 and 3, respectively. There’s no denying that this board brings performance with the running of an ATmega2560, but it provides a substantial number of I/O pins and program space as well. ![]() Pins on the chip and pins on the board are not the same thing. However in the schemati I2C bus seems to be on pins 43 and 44. This pin can be controlled by any sensor output, or manually via a button. Arduino Mega 2560 is an all-around good option. Documentation seems to say that I2C bus uses pins 20 and 21. ISR (PCINT2_vect) pin change interrupt for D0 to D7 Flash Memory: 256 KB, 8KB used by bootloader. These URL's say interrupts 0 and 1 are on digital pins 43 and 44:. ISR (PCINT1_vect) pin change interrupt for A0 to A5 The 8-bit board with 54 digital pins, 16 analog inputs, and 4 serial ports. ISR (PCINT0_vect) pin change interrupt for D8 to D13 SPI port, and interrupt system to continue functioning. I'm not sure which service to use? Apparently my options are: CBGA-pinout ATmega640/1280/2560 12345678 9 10 A GND AREF PF0 PF2 PF5 PK0 PK3 PK6 GND VCC B AVCC PG5 PF1 PF3 PF6 PK1 PK4 PK7 PA0 PA2. I'm trying to understand the "Simple Pin Change Interrupt on all pins" I'm trying to set it up so that when a limit switch is pressed, I use an interruption (the code will be the same for each interruption for these switches, which I think is good b/c the method I'm trying to use allows for two or more pins to share the same routine. I can't change these pins given the project rn, but I need to enable interruptions on each of these pins. ![]() I have pins corresponding to each of my (8) limit switches: pins 40 - 47. I am using an arduino mega and limit switches.
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