mbed school / Mbed 2 deprecated ch5_mbed_dust_sensor

ch5_mbed_dust_sensor

Dependencies:   mbed

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Show/hide line numbers main.cpp Source File

main.cpp

00001 #include "mbed.h"
00002  
00003 Serial pc(USBTX, USBRX);
00004 InterruptIn probe(p19);
00005 DigitalOut led(LED1);
00006 
00007 Timer timer;
00008 Ticker ticker;
00009 
00010 uint32_t low_time = 0;
00011 
00012 void down();
00013 void up();
00014 
00015 void tick()
00016 {
00017     pc.printf("%d us, %f %%\r\n", low_time, low_time / (30.0 * 1000000));
00018     low_time = 0;
00019 }
00020  
00021 void down()
00022 {
00023     probe.rise(&up);
00024     led = 0;
00025     timer.start();
00026 }
00027 
00028 void up()
00029 {
00030     led = 1;
00031     timer.stop();
00032     probe.fall(&down);
00033     
00034     low_time += timer.read_us();
00035     timer.reset();
00036 }
00037  
00038 int main()
00039 {
00040     pc.baud(115200);
00041     pc.printf("Dust Sensor test\r\n");
00042     probe.fall(&down);
00043     ticker.attach(tick, 30);    
00044 }
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