Nuvoton
NuMaker ADC read gas sensor (MQ3)
Diff: main.cpp
- Revision:
- 0:1f30d2df739e
- Child:
- 1:605a7fdd4e93
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Oct 14 08:19:45 2016 +0000
@@ -0,0 +1,16 @@
+// NuMaker-PFM-NUC472 use ADC0 (A0) to read gas sensor (MQ-3)
+#include "mbed.h"
+
+AnalogIn adc0(A0); // connected to MQ-3 gas sensor
+DigitalOut led(LED1);
+
+int main(void)
+{
+ 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;
+ wait(0.2f);
+ }
+}