Nuvoton / Mbed OS NuMaker-mbed-ADC0_MQ3

NuMaker ADC read gas sensor (MQ3)

main.cpp@10:84e277e4aae7, 2018-04-19 (annotated)

Committer:
ccli8
Date:
Thu Apr 19 09:30:13 2018 +0800
Revision:
10:84e277e4aae7
Parent:
8:29e0733dd8b2
Child:
12:015640054db1
Unify connecting UNO A0 to MQ-3 gas sensor for test

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"
ccli8 10:84e277e4aae7 3
ccli8 10:84e277e4aae7 4 /* NOTE: Connect UNO A0 to MQ-3 gas sensor for this test */
ccli8 10:84e277e4aae7 5 AnalogIn adc0(A0);
rkuo2000 0:1f30d2df739e 6
rkuo2000 0:1f30d2df739e 7 DigitalOut led(LED1);
rkuo2000 0:1f30d2df739e 8
rkuo2000 0:1f30d2df739e 9 int main(void)
rkuo2000 0:1f30d2df739e 10 {
rkuo2000 0:1f30d2df739e 11 printf("ADC0 start reading...\n\r");
rkuo2000 0:1f30d2df739e 12 while (1) {
rkuo2000 0:1f30d2df739e 13 printf("ADC0 value= 0x%4x, percentage= %3.3f%%\n\r",adc0.read_u16(), adc0.read()*100.0f);
rkuo2000 0:1f30d2df739e 14 if(adc0 > 0.7f) led = 0; // > 0.7 * Vcc wil turn on led
rkuo2000 0:1f30d2df739e 15 else led = 1;
rkuo2000 0:1f30d2df739e 16 wait(0.2f);
rkuo2000 0:1f30d2df739e 17 }
rkuo2000 0:1f30d2df739e 18 }