mirror of
https://github.com/mysensors/MySensors.git
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152 lines
4.5 KiB
C++
152 lines
4.5 KiB
C++
/*
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* The MySensors Arduino library handles the wireless radio link and protocol
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* between your home built sensors/actuators and HA controller of choice.
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* The sensors forms a self healing radio network with optional repeaters. Each
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* repeater and gateway builds a routing tables in EEPROM which keeps track of the
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* network topology allowing messages to be routed to nodes.
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*
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* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
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* Copyright (C) 2013-2026 Sensnology AB
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* Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
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*
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* Documentation: http://www.mysensors.org
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* Support Forum: http://forum.mysensors.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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*******************************
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*
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* DESCRIPTION
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*
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* Dust Sensor for SamYoung DSM501
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* connect the sensor as follows :
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* Pin 2 of dust sensor PM1 -> Digital 3 (PMW)
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* Pin 3 of dust sensor -> +5V
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* Pin 4 of dust sensor PM2.5 -> Digital 6 (PWM)
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* Pin 5 of dust sensor -> Ground
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* Datasheet: http://www.samyoungsnc.com/products/3-1%20Specification%20DSM501.pdf
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* Contributor: epierre
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**/
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// Enable debug prints
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#define MY_DEBUG
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// Enable and select radio type attached
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#define MY_RADIO_RF24
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//#define MY_RADIO_NRF5_ESB
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//#define MY_RADIO_RFM69
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//#define MY_RADIO_RFM95
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#include <MySensors.h>
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#define CHILD_ID_DUST_PM10 0
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#define CHILD_ID_DUST_PM25 1
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#define DUST_SENSOR_DIGITAL_PIN_PM10 6
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#define DUST_SENSOR_DIGITAL_PIN_PM25 3
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uint32_t SLEEP_TIME = 30*1000; // Sleep time between reads (in milliseconds)
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//VARIABLES
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int val = 0; // variable to store the value coming from the sensor
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float valDUSTPM25 =0.0;
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float lastDUSTPM25 =0.0;
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float valDUSTPM10 =0.0;
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float lastDUSTPM10 =0.0;
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uint32_t duration;
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uint32_t starttime;
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uint32_t endtime;
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uint32_t sampletime_ms = 30000;
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uint32_t lowpulseoccupancy = 0;
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float ratio = 0;
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long concentrationPM25 = 0;
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long concentrationPM10 = 0;
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MyMessage dustMsgPM10(CHILD_ID_DUST_PM10, V_LEVEL);
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MyMessage msgPM10(CHILD_ID_DUST_PM10, V_UNIT_PREFIX);
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MyMessage dustMsgPM25(CHILD_ID_DUST_PM25, V_LEVEL);
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MyMessage msgPM25(CHILD_ID_DUST_PM25, V_UNIT_PREFIX);
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void setup()
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{
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pinMode(DUST_SENSOR_DIGITAL_PIN_PM10,INPUT);
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pinMode(DUST_SENSOR_DIGITAL_PIN_PM25,INPUT);
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}
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void presentation()
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{
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// Send the sketch version information to the gateway and Controller
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sendSketchInfo("Dust Sensor DSM501", "1.4");
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// Register all sensors to gateway (they will be created as child devices)
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present(CHILD_ID_DUST_PM10, S_DUST);
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send(msgPM10.set("ppm"));
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present(CHILD_ID_DUST_PM25, S_DUST);
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send(msgPM25.set("ppm"));
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}
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void loop()
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{
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//get PM 2.5 density of particles over 2.5 µm.
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concentrationPM25=(long)getPM(DUST_SENSOR_DIGITAL_PIN_PM25);
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Serial.print("PM25: ");
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Serial.println(concentrationPM25);
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Serial.print("\n");
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if ((concentrationPM25 != lastDUSTPM25)&&(concentrationPM25>0)) {
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send(dustMsgPM25.set((int32_t)ceil(concentrationPM25)));
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lastDUSTPM25 = ceil(concentrationPM25);
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}
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//get PM 1.0 - density of particles over 1 µm.
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concentrationPM10=getPM(DUST_SENSOR_DIGITAL_PIN_PM10);
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Serial.print("PM10: ");
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Serial.println(concentrationPM10);
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Serial.print("\n");
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//ppmv=mg/m3 * (0.08205*Tmp)/Molecular_mass
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//0.08205 = Universal gas constant in atm·m3/(kmol·K)
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int temp=20; //external temperature, if you can replace this with a DHT11 or better
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long ppmv=(concentrationPM10*0.0283168/100/1000) * (0.08205*temp)/0.01;
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if ((ceil(concentrationPM10) != lastDUSTPM10)&&((long)concentrationPM10>0)) {
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send(dustMsgPM10.set((int32_t)ppmv));
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lastDUSTPM10 = ceil(concentrationPM10);
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}
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//sleep to save on radio
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sleep(SLEEP_TIME);
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}
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long getPM(int DUST_SENSOR_DIGITAL_PIN)
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{
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starttime = millis();
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while (1) {
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duration = pulseIn(DUST_SENSOR_DIGITAL_PIN, LOW);
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lowpulseoccupancy += duration;
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endtime = millis();
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if ((endtime-starttime) > sampletime_ms) {
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ratio = (lowpulseoccupancy-endtime+starttime)/(sampletime_ms*10.0); // Integer percentage 0=>100
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long concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
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//Serial.print("lowpulseoccupancy:");
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//Serial.print(lowpulseoccupancy);
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//Serial.print("\n");
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//Serial.print("ratio:");
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//Serial.print(ratio);
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//Serial.print("\n");
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//Serial.print("DSM501A:");
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//Serial.println(concentration);
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//Serial.print("\n");
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lowpulseoccupancy = 0;
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return(concentration);
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}
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}
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}
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