Nuvoton / Mbed OS NuMaker-mbed-ADC0_MQ3

NuMaker ADC read gas sensor (MQ3)

main.cpp@1:605a7fdd4e93, 2016-10-14 (annotated)

Committer:
rkuo2000
Date:
Fri Oct 14 08:24:58 2016 +0000
Revision:
1:605a7fdd4e93
Parent:
0:1f30d2df739e
Child:
5:fc7ae837af13
ADC0 (A0/PE1) to read gas sensor (MQ3) tested with a whiteboard marker

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rkuo2000 1:605a7fdd4e93 1 // NuMaker-PFM-NUC472 use ADC0 (A0/PE_1) to read gas sensor (MQ-3)
rkuo2000 0:1f30d2df739e 2 #include "mbed.h"
rkuo2000 0:1f30d2df739e 3
rkuo2000 1:605a7fdd4e93 4 AnalogIn adc0(PE_1); // A0 connected to MQ-3 gas sensor
rkuo2000 0:1f30d2df739e 5 DigitalOut led(LED1);
rkuo2000 0:1f30d2df739e 6
rkuo2000 0:1f30d2df739e 7 int main(void)
rkuo2000 0:1f30d2df739e 8 {
rkuo2000 0:1f30d2df739e 9 printf("ADC0 start reading...\n\r");
rkuo2000 0:1f30d2df739e 10 while (1) {
rkuo2000 0:1f30d2df739e 11 printf("ADC0 value= 0x%4x, percentage= %3.3f%%\n\r",adc0.read_u16(), adc0.read()*100.0f);
rkuo2000 0:1f30d2df739e 12 if(adc0 > 0.7f) led = 0; // > 0.7 * Vcc wil turn on led
rkuo2000 0:1f30d2df739e 13 else led = 1;
rkuo2000 0:1f30d2df739e 14 wait(0.2f);
rkuo2000 0:1f30d2df739e 15 }
rkuo2000 0:1f30d2df739e 16 }