File content as of revision 0:db459a4b2e6b:

/*
AnalogInterrupt

 
 The circuit:
 * Three analog comparators
 * photoresistor from comparator + inputs to +3.3V
 * 10K resistor from comparator + inputs to ground
 * Four resistors (1K or more) in series from ground to +3.3V
 * Junction of each resistor to a single comparator - input
 * Outputs of comparators to digital pins D2, D3, D4
 
 created 1 Jul 2009
 modified 9 Apr 2012
 by Tom Igoe 
 
 modified for Nucleo / mbed 12 Aug 2017
 by Sheila Ross
 
 This example code is in the public domain.
 
 */


#include "mbed.h"


// Define the interrupt pins
InterruptIn dark_dim(D2);
InterruptIn dim_medium(D3);
InterruptIn medium_bright(D4);

// Create a serial connection over our USB
Serial pc(USBTX, USBRX);

void dark();
void dim();
void medium();
void bright();

int main() {
  
    pc.baud(9600);  // Set serial communication speed
    dark_dim.fall(&dark);
    dark_dim.rise(&dim);
    dim_medium.fall(&dim);
    dim_medium.rise(&medium);
    medium_bright.fall(&medium);
    medium_bright.rise(&bright);

    while(1) {
        wait(1); 

    }
}

void dark() {
    pc.printf("dark\n");
}

void dim() {
    pc.printf("dim\n");
}

void medium() {
    pc.printf("medium\n");
}

void bright() {
    pc.printf("bright\n");
}