Richard Kuo / Mbed OS NTOUEE-mbed-ADC_Sensor

mbed ADC read gas sensor

main.cpp@0:2e74e9d97542, 2016-10-20 (annotated)

Committer:
rkuo2000
Date:
Thu Oct 20 12:31:28 2016 +0000
Revision:
0:2e74e9d97542
mbed ADC read sensor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rkuo2000 0:2e74e9d97542 1 // using NuMaker-PFM-NUC472 ADC0 (A0/PE_1) to read gas sensor (MQ-3)
rkuo2000 0:2e74e9d97542 2 #include "mbed.h"
rkuo2000 0:2e74e9d97542 3
rkuo2000 0:2e74e9d97542 4 AnalogIn adc0(PE_1); // A0 connected to MQ-3 gas sensor
rkuo2000 0:2e74e9d97542 5 DigitalOut led(LED1);
rkuo2000 0:2e74e9d97542 6
rkuo2000 0:2e74e9d97542 7 int main(void)
rkuo2000 0:2e74e9d97542 8 {
rkuo2000 0:2e74e9d97542 9 printf("ADC0 start reading...\n\r");
rkuo2000 0:2e74e9d97542 10 while (1) {
rkuo2000 0:2e74e9d97542 11 printf("ADC0 value= 0x%4x, percentage= %3.3f%%\n\r",adc0.read_u16(), adc0.read()*100.0f);
rkuo2000 0:2e74e9d97542 12 if(adc0 > 0.7f) led = 0; // > 0.7 * Vcc wil turn on led
rkuo2000 0:2e74e9d97542 13 else led = 1;
rkuo2000 0:2e74e9d97542 14 wait(0.2f);
rkuo2000 0:2e74e9d97542 15 }
rkuo2000 0:2e74e9d97542 16 }