Nuvoton / Mbed OS NuMaker-mbed-ADC0_MQ3

NuMaker ADC read gas sensor (MQ3)

main.cpp

Committer:
SHLIU1@OANBE02333.nuvoton.com
Date:
2021-02-24
Revision:
12:015640054db1
Parent:
10:84e277e4aae7

File content as of revision 12:015640054db1:

// NuMaker-PFM-NUC472 use ADC0 (A0/PE_1) to read gas sensor (MQ-3)
#include "mbed.h"

/* NOTE: Connect UNO A0 to MQ-3 gas sensor for this test */
AnalogIn   adc0(A0);

DigitalOut led(LED1);

int main(void)
{
#ifdef MBED_MAJOR_VERSION
    printf("Mbed OS version %d.%d.%d\r\n\n", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
#endif
    printf("ADC0 start reading...\n\r");
    while (1) { 
        printf("ADC0 value= 0x%4x, percentage= %3.3f%%\n\r",adc0.read_u16(), adc0.read()*100.0f);
        if(adc0 > 0.7f) led = 0; // > 0.7 * Vcc wil turn on led
        else            led = 1;
#if MBED_MAJOR_VERSION >= 6 
	ThisThread::sleep_for(200);
#else
        wait(0.2f);
#endif

    }
}