hobbielektronika / Mbed 2 deprecated 05_comparator_demo

/** comparatorin_demo * Simple program to demonstrate the basic functions * of the analog comparator of the FRDM-KL25Z board. * * Used library: * - ComparatorIn //https://developer.mbed.org/users/frankvnk/code/ComparatorIn/ * written by Frank Vannieuwkerke * * Hardware requirements: * - FRDM-KL25 board * - CdS photoresistor pulled up by 10 k * - Connecect the midpoint of the divider to PTE29 * * 10k CdS photoresistor * +3.3V --/\/\/\---+---/\/\/\---- GND * | * PTE29 * */

Dependencies:   ComparatorIn mbed

Fork of 05_comparator_demo by Istvan Cserny

main.cpp

Committer:
frankvnk
Date:
2013-07-20
Revision:
4:07dd82e3f934
Parent:
2:bb19e60cb933
Child:
7:a4f884972a0e

File content as of revision 4:07dd82e3f934:

#include "ComparatorIn.h"
#include "mbed.h"

DigitalOut blinker (LED_BLUE);
DigitalOut cmpled (LED_GREEN);
DigitalOut cmp_en (PTD5);
AnalogIn cmp_lvl (PTB0);
ComparatorIn compi(PTC8, PTE30); // in+ = PTC8, in- = 12-bit DAC 

// Comparator callback functions
void cmp_rise_ISR(void)
{
    cmpled = 0;
}

void cmp_fall_ISR(void)
{
    cmpled = 1;
}



int main()
{
    cmp_en = 1;
    cmpled = 1;

    compi.rising(&cmp_rise_ISR);                // Set pointer to rising interrupt function
    compi.falling(&cmp_fall_ISR);               // Set pointer to falling interrupt function
    compi.treshold(0.3);                        // Set comparator threshold to 1V = 0.3 * 3.3V

    while(1)
    {
        printf("Light sensor : %7.5f Volt\n",cmp_lvl*3.3);
        blinker = 1;
        wait(1);
        blinker = 0;
        wait(0.2);
        if (compi.status() == 0x01)
        {
            printf("*** Treshold reached : %7.5f\n",cmp_lvl*3.3);
        }
    }
}