Use more than 1 interrupts in arduino mega2560.

Using Arduino Programming Questions
#1

Hallo,
I am currently working on a robot car, In the below code I have taken the ppm signals from the RC controller and converted it to values which driver can run the motors on.

I connected thr RC 4 channels to arduino mega 2,3,20,21. to get the values as interrupts but I am able to read the signals from pins 2 and 3 but I am unable to process the interrupts from 20 and 21. I checked all four channels in oscilloscope the ppm signals are working properly but I am not able to read it in the processor.

The main problem here is I can take values from interruptRoutine1 but I am not able to get the values from
interruptRoutine2 and so on, can anybody please let me know is it the problem in the interruptRoutine or should I have to change any timer bits in ISR.

Any help is appreciated

interonly1.ino (4.13 KB)

#2

Never Ever put Serial.print() statements in an ISR. They are slow and they need interrupts to be enabled and interrupts are disabled inside an ISR.

…R

#3

You only attach interrupt handlers to interrupts 0 and 1 (from pins 2 and 3). You can't expect unattached interrupt handlers to be fired.

#4