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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 <henrik.ekblad@mysensors.org>
* 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 3
#define DUST_SENSOR_DIGITAL_PIN_PM25 6
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;
int temp=20; //external temperature, if you can replace this with a DHT11 or better
float ppmv;
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", "1.5");
// 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);
}
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");
//ppmv=mg/m3 * (0.08205*Tmp)/Molecular_mass
//0.08205 = Universal gas constant in atm·m3/(kmol·K)
ppmv=(float)(((concentrationPM25*0.0283168)/100) * ((0.08205*temp)/0.01))/1000;
if ((concentrationPM25 != lastDUSTPM25)&&(concentrationPM25>0)) {
gw.send(dustMsgPM25.set(ppmv,3));
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");
//ppmv=mg/m3 * (0.08205*Tmp)/Molecular_mass
//0.08205 = Universal gas constant in atm·m3/(kmol·K)
ppmv=(((concentrationPM10*0.0283168/100) * (0.08205*temp)/0.01))/1000;
if ((ceil(concentrationPM10) != lastDUSTPM10)&&((long)concentrationPM10>0)) {
gw.send(dustMsgPM10.set(ppmv,3));
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);
}
}
}
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