The code is designed to "stop" as the the digitalWrite output will driver external equipment to override a situation and the for( ) There will be hardware alerting me of the situation at this point. The code for the ISR calls are exactly the same (cut/past) except updating the pins as required in the attachinterrupt command and the pinMode in the setup void. I simulate the CHANGE condition by removing the jumper thats a logic 1 from each interrupt pin that is noted as an external input pin for the 2560 and light up a led to show the code drops thru right. Yes, any digital input pin can be used to generate an interrupt via the pinchange interrupt mode. I understand the Elegoo is a compatible and assume (maybe in error) there is a pin for pin functionality. The interrupts are being called independently so no sequence issues, etcĪll the the referenced external interrupts from the Arduino site do not work in the CHANGE mode. I am using attachinterrupts on the 2560 in the CHANGE mode but only pin 2 and 3 work as described. Six pins are used for creating external interrupts i.e interrupt 0(0), interrupt 1(3), interrupt 2(21), interrupt 3(20), interrupt 4(19), interrupt 5(18). Im trying to use the external interrupts on pins 20 and 21 (SDA and SCL), and Im noticing that theres some unpredictable behavior that doesnt seem to be officially documented anywhere. Normally you should use digitalPinToInterrupt (pin) to translate the actual digital pin to the specific interrupt number. Arduino Mega, SDA/SCL pins, and interrupts. My used hardwarea is an Arduino Mega with a RAMPS 1.4 shield and a RepRap Discount SmartController LCD including an encoder and button. Then at T=0+ after that trigger, I need to see the state of an external device and then watch for a CHANGE in its status. attachInterrupt () External Interrupts Description Digital Pins With Interrupts The first parameter to attachInterrupt () is an interrupt number. I did try to run a simple sample code from the Pin Change Interrupt Library (PCINT) library, but for some reason it did not trigger the interrupt. This sketch simply monitors digital pins 2 (corresponding to interrupt 0. If you have one of these, you can keep the SW pin connection and modify the sketch below to include the push button code. Some boards (such as the Arduino Mega 2560) have more external interrupts than others. I need to see conditions after an external trigger causes specific code for that external source. The pinout of the rotary encoder module is as follows. Digital I/O Pins 54 (of which 15 provide PWM output) Analog Input Pins 16. I am new to this so forgive me as I am in a learning curve. The Mega2560 Pro Mini board has all the IOs of Arduino Mega2560 R3, following are the parameters. I am having issues with an Elegoo MEGA2560 and its external interrupt handling.
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