Mateusz Grzywacz
Oh my god this is a crusty piece of air quality sensor. I barely works. It is good only for some major smoke detection, not really pariculte matter. Don't buy it, but if you already did here is a working library for it. Enjoy.
Revision 0:f4e3a6f03b9c, committed 2018-01-31
- Comitter:
- amateusz
- Date:
- Wed Jan 31 11:55:20 2018 +0000
- Commit message:
- inital and final commit
Changed in this revision
| GP2Y1010AU0F.cpp | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r f4e3a6f03b9c GP2Y1010AU0F.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/GP2Y1010AU0F.cpp Wed Jan 31 11:55:20 2018 +0000
@@ -0,0 +1,75 @@
+#include "mbed.h"
+
+class GP2Y1010AU0F
+{
+public:
+ GP2Y1010AU0F(PinName aout, PinName iled): _iled(iled), _aout(aout), _aout_at_no_dust(0.7) {
+ };
+
+ void measure() {
+ _measurement_ready = false;
+ _measure();
+ };
+
+ bool getVoltage(float & value) {
+ if (_measurement_ready == false) return NULL;
+ else {
+ float dust_density = 0;
+ dust_density = ((float)_last_measurement)/(65535.0f/3.3f/9.25f);
+ value = dust_density;
+ return true;
+ }
+ }; // ug / m^3
+
+ float convertVoltageToMg(float voltage) {
+ voltage -= _aout_at_no_dust; // [V] from 0
+ voltage /= _dust_sensitivity; // [0.1mg] == [100ug] / m^3
+ voltage *= 100.0f;
+ return voltage;
+ }
+
+ void tryTosetAoutAtNoDust(float newNoDustVoltage) {
+ if (newNoDustVoltage < _aout_at_no_dust)
+ _aout_at_no_dust = (newNoDustVoltage + 5*_aout_at_no_dust) / 6;
+// printf("Aout at no dust: %.3f\r\n", _aout_at_no_dust);
+ }
+
+ float getAoutAtNoDust() {
+ return _aout_at_no_dust;
+ }
+
+private:
+ AnalogIn _aout;
+ DigitalOut _iled;
+ Timeout _turnILEDOffTimeout;
+ Timeout _sampleAOUTTimeout;
+ Timeout _measurementReadyTimeout;
+ unsigned short _last_measurement;
+ bool _measurement_ready;
+ static const float _dust_sensitivity = 0.5; // [V] / [mg/m^3]
+ float _aout_at_no_dust; // [V] ?
+
+ void _measure() {
+ _sampleAOUTTimeout.attach(callback(this, &GP2Y1010AU0F::_sampleAOUT), .00028);
+ _turnILEDOffTimeout.attach(callback(this, &GP2Y1010AU0F::_turnILEDOff), .00032);
+ _measurementReadyTimeout.attach(callback(this, &GP2Y1010AU0F::_ready), .037);
+
+ _turnILEDOn();
+ };
+ void _turnILEDOn() {
+ _iled.write(1);
+// pc.printf("O");
+ };
+ void _turnILEDOff() {
+ _iled.write(0);
+
+// pc.printf("C\r\n");
+ };
+ void _sampleAOUT() {
+ _last_measurement = _aout.read_u16();
+// pc.printf("S");
+ };
+ void _ready() {
+ _measurement_ready = true;
+ };
+};
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