File content as of revision 0:f3b9844205f2:

#include "mbed.h"
 
AnalogIn analog_value(PA_0);
 
DigitalOut led(LED1);
Serial pc(USBTX,USBRX,115200);
Timer t;

int main() {
    pc.format(8,SerialBase::None,1);
    float meas;
    led = 1;
    pc.printf("\nAnalogIn example\n");
    float max, min, mean;
    max = analog_value.read()*3300;
    min = max;
    
    
    while(1) {
        meas = analog_value.read(); // Converts and read the analog input value (value from 0.0 to 1.0)
        meas = meas * 3300; // Change the value to be in the 0 to 3300 range
        if (meas>max)
            max = meas;
        if (meas<min)
            min = meas;
        mean = (max + min)/2;
        pc.printf("measure = %.0f mV, mean = %.0f mV\n", meas, mean);
        if (meas < mean) { // If the value is greater than 2V then switch the LED on
          t.start();
          while(analog_value.read()*3300 < mean);
          t.stop();
          //if(t.read() > 0.00001)
          pc.printf("The time taken was %f seconds\n", t.read());
          wait(1);
        }
        t.reset();
    }
}