File content as of revision 1:dc5a274adc7d:

#include "mbed.h"

#define voltage 3300
#define mv(x)       ((x*voltage)/0xFFFF)

AnalogIn analog_value(A0);

Serial pc(SERIAL_TX, SERIAL_RX);

DigitalOut led(LED1);

Ticker toggle_ticker;
int voltages =0;

bool start = true;

void toggle()
{
    int meas;

    meas = analog_value.read_u16(); // Converts and read the analog input value (value from 0.0 to 0xFFFF)
    meas = mv(meas); // Change the value to be in the 0 to 3300 range
    while(!pc.writeable());


    led= !led;
    if (meas > voltages ) { // If the value is greater than 2V then switch the LED on
        start = true;
    }
    if(start) {
        printf("%d\n", meas);
    }
}

void flushSerialPort()
{
    while(pc.readable())
        pc.getc();
    return;
}

int main()
{
    int prijData=0;
    int Data1=0;
    float Data2=0;
    pc.baud(115200);
    toggle_ticker.detach();
    toggle_ticker.attach(&toggle, 0.01);
    printf("\nAnalogIn example, data (numbers) are in mV.\n");

    while(1) {
        prijData=pc.scanf("%d %f",&Data1,&Data2);
        if(prijData==2) {
            //pc.printf()
            if(Data1==1) {
                toggle_ticker.detach();
                toggle_ticker.attach(&toggle, Data2);
            } else if(Data1==2) {
                toggle_ticker.detach();
            } else if(Data1==3) {
                voltages=(int)Data2;
                start = false;
            }
        } else {
            while(!pc.writeable());
            printf("HELP - MENU\n");
            while(!pc.writeable());
            printf("Data send to PC (numbers) are in mV.\n");
            while(!pc.writeable());
            printf("Set data exactly.\n");
            while(!pc.writeable());
            printf("Write to console: \"xx yy\", where xx is a code of seting and yy his value.\n");
            while(!pc.writeable());
            printf("01 y.yyy - set period[s] to send data to PC and start reading value, example:01 0.01\n");
            while(!pc.writeable());
            printf("02 0 - stop reading value example:02 0\n");
            while(!pc.writeable());
            printf("03 yyyy - Wait for minimum voltage[mV] (to 3299) and send data example:03 2000\n");
        while(!pc.writeable());
            printf("end HELP\n");
        flushSerialPort();
        }
        // wait(0.2); // 200 ms
    }
}