good sensibility sensor

Author: empierre

libraries/MySensors/examples/DustSensor/DustSensor_SamYoung_DSM501.ino

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+/**
+ * The MySensors Arduino library handles the wireless radio link and protocol
+ * between your home built sensors/actuators and HA controller of choice.
+ * The sensors forms a self healing radio network with optional repeaters. Each
+ * repeater and gateway builds a routing tables in EEPROM which keeps track of the
+ * network topology allowing messages to be routed to nodes.
+ *
+ * Created by Henrik Ekblad <[email protected]>
+ * Copyright (C) 2013-2015 Sensnology AB
+ * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
+ *
+ * Documentation: http://www.mysensors.org
+ * Support Forum: http://forum.mysensors.org
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ *******************************
+ *
+ * DESCRIPTION
+ * 
+ * Dust Sensor for SamYoung DSM501
+ *   connect the sensor as follows :
+ *    Pin 2 of dust sensor PM1      -> Digital 3 (PMW)
+ *	  Pin 3 of dust sensor          -> +5V 
+ * 	  Pin 4 of dust sensor PM2.5    -> Digital 6 (PWM) 
+ * 	  Pin 5 of dust sensor          -> Ground
+ * Datasheet: http://www.samyoungsnc.com/products/3-1%20Specification%20DSM501.pdf
+* Contributor: epierre
+**/
+  
+
+#include <MySensor.h>  
+#include <SPI.h>
+
+#define CHILD_ID_DUST_PM10            0
+#define CHILD_ID_DUST_PM25            1
+#define DUST_SENSOR_DIGITAL_PIN_PM10  6
+#define DUST_SENSOR_DIGITAL_PIN_PM25  3
+
+unsigned long SLEEP_TIME = 30*1000; // Sleep time between reads (in milliseconds)
+//VARIABLES
+int val = 0;           // variable to store the value coming from the sensor
+float valDUSTPM25 =0.0;
+float lastDUSTPM25 =0.0;
+float valDUSTPM10 =0.0;
+float lastDUSTPM10 =0.0;
+unsigned long duration;
+unsigned long starttime;
+unsigned long endtime;
+unsigned long sampletime_ms = 30000;
+unsigned long lowpulseoccupancy = 0;
+float ratio = 0;
+long concentrationPM25 = 0;
+long concentrationPM10 = 0;
+
+MySensor gw;
+MyMessage dustMsgPM10(CHILD_ID_DUST_PM10, V_LEVEL);
+MyMessage msgPM10(CHILD_ID_DUST_PM10, V_UNIT_PREFIX);
+MyMessage dustMsgPM25(CHILD_ID_DUST_PM25, V_LEVEL);
+MyMessage msgPM25(CHILD_ID_DUST_PM25, V_UNIT_PREFIX);
+
+void setup()  
+{
+  gw.begin();
+
+  // Send the sketch version information to the gateway and Controller
+  gw.sendSketchInfo("Dust Sensor DSM501", "1.4");
+
+  // Register all sensors to gateway (they will be created as child devices)
+  gw.present(CHILD_ID_DUST_PM10, S_DUST);  
+  gw.send(msgPM10.set("ppm"));
+  gw.present(CHILD_ID_DUST_PM25, S_DUST);  
+  gw.send(msgPM25.set("ppm"));
+  
+  pinMode(DUST_SENSOR_DIGITAL_PIN_PM10,INPUT);
+  pinMode(DUST_SENSOR_DIGITAL_PIN_PM25,INPUT);
+  Serial.begin(115200);  
+}
+
+void loop()      
+{    
+
+  //get PM 2.5 density of particles over 2.5 μm.
+  concentrationPM25=(long)getPM(DUST_SENSOR_DIGITAL_PIN_PM25);
+  Serial.print("PM25: ");
+  Serial.println(concentrationPM25);
+  Serial.print("\n");
+
+  if ((concentrationPM25 != lastDUSTPM25)&&(concentrationPM25>0)) {
+      gw.send(dustMsgPM25.set((long)ceil(concentrationPM25)));
+      lastDUSTPM25 = ceil(concentrationPM25);
+  }
+ //get PM 1.0 - density of particles over 1 μm.
+  concentrationPM10=getPM(DUST_SENSOR_DIGITAL_PIN_PM10);
+  Serial.print("PM10: ");
+  Serial.println(concentrationPM10);
+  Serial.print("\n");
+  if ((ceil(concentrationPM10) != lastDUSTPM10)&&((long)concentrationPM10>0)) {
+      gw.send(dustMsgPM10.set((long)ceil(concentrationPM10)));
+      lastDUSTPM10 = ceil(concentrationPM10);
+  }
+ 
+  //sleep to save on radio
+  gw.sleep(SLEEP_TIME);
+  
+}
+
+
+long getPM(int DUST_SENSOR_DIGITAL_PIN) {
+
+  starttime = millis();
+
+  while (1) {
+  
+	  duration = pulseIn(DUST_SENSOR_DIGITAL_PIN, LOW);
+	  lowpulseoccupancy += duration;
+	  endtime = millis();
+	  
+	  if ((endtime-starttime) > sampletime_ms)
+	  {
+		ratio = (lowpulseoccupancy-endtime+starttime)/(sampletime_ms*10.0);  // Integer percentage 0=>100
+		long concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
+		//Serial.print("lowpulseoccupancy:");
+		//Serial.print(lowpulseoccupancy);
+		//Serial.print("\n");
+		//Serial.print("ratio:");
+		//Serial.print(ratio);
+		//Serial.print("\n");
+		//Serial.print("DSM501A:");
+		//Serial.println(concentration);
+		//Serial.print("\n");
+		
+		lowpulseoccupancy = 0;
+		return(concentration);	  
+	  }
+  }  
+}