I have two Arduino Uno boards. Arduino Uno A has grbl 1.1 installed and is running my CNC plotter. I want to setup Arduino Uno B so that it can read the PWM signal from pin 11 of Arduino A and use it to change pens on an automatic tool changer I plan to build for the CNC plotter.

The code below is the beginnings of the software I want to write for the Automatic Tool Changer. I uploaded it to Arduino Uno B, and it is supposed to read the PWM from pin 11 on Arduino A and print a result on the serial monitor, but it is not doing that. It is not showing anything on the serial monitor when I run it, and it does not show any errors when I compile it.

What am I doing wrong? Thanks in advance for your help.

ARDUINO UNO CODE:

unsigned long timer[4];
byte last_channel[4];
int input[4];

void setup (){
Serial.begin(9600);

PCICR |= (1 << PCIE0);
PCMSK0 |= (1<< PCINT0);

}

void loop (){

 
}
ISR(PCINT0_vect){
 timer[0]= micros();
if(last_channel[0] == 0 && PINB & B00000001){
 last_channel[0] = 1;
 timer[1] = timer

• ;

   }
 
else if (last_channel[0] == 1 && !(PINB & B00000001)){
  last_channel[0] = 0;
  input[0] = timer[0] - timer [1];
}
}
void print(){
Serial.print(input[0]);
Serial.print(" _");
}

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