Ray Liu / Mbed OS NuMaker-mbed-ADC0_MQ3

Modify the file main.cpp for M487

main.cpp@1:43b27635ae9e, 2017-10-02 (annotated)

Committer:
shliu1
Date:
Mon Oct 02 00:25:27 2017 +0000
Revision:
1:43b27635ae9e
Parent:
0:9a9104a3d71f 
Modify the file main.cpp for M487

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shliu1 0:9a9104a3d71f 1 // NuMaker-PFM-NUC472 use ADC0 (A0/PE_1) to read gas sensor (MQ-3)
shliu1 0:9a9104a3d71f 2 #include "mbed.h"
shliu1 0:9a9104a3d71f 3 #if defined(TARGET_NUMAKER_PFM_NUC472)
shliu1 0:9a9104a3d71f 4 AnalogIn adc0(PE_1); // A0 connected to MQ-3 gas sensor
shliu1 0:9a9104a3d71f 5 #elif defined(TARGET_NUMAKER_PFM_M453)
shliu1 0:9a9104a3d71f 6 AnalogIn adc0(PB_0);
shliu1 0:9a9104a3d71f 7 #elif defined(TARGET_NUMAKER_PFM_M487)
shliu1 0:9a9104a3d71f 8 AnalogIn adc0(PB_6);
shliu1 0:9a9104a3d71f 9 #endif
shliu1 0:9a9104a3d71f 10
shliu1 0:9a9104a3d71f 11 DigitalOut led(LED1);
shliu1 0:9a9104a3d71f 12
shliu1 0:9a9104a3d71f 13 int main(void)
shliu1 0:9a9104a3d71f 14 {
shliu1 0:9a9104a3d71f 15 printf("ADC0 start reading...\n\r");
shliu1 0:9a9104a3d71f 16 while (1) {
shliu1 0:9a9104a3d71f 17 printf("ADC0 value= 0x%4x, percentage= %3.3f%%\n\r",adc0.read_u16(), adc0.read()*100.0f);
shliu1 0:9a9104a3d71f 18 if(adc0 > 0.7f) led = 0; // > 0.7 * Vcc wil turn on led
shliu1 0:9a9104a3d71f 19 else led = 1;
shliu1 0:9a9104a3d71f 20 wait(0.2f);
shliu1 0:9a9104a3d71f 21 }
shliu1 0:9a9104a3d71f 22 }