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DustSensor-BJHIKE-HK-A5.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) 2013-2017 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
* Arduino Dust Sensor for DfRobot HK-A5 laser sensor
* connect the sensor as follows :
* RX -> TX
* TX -> RX
* VCC -> VCC
* GND -> GND
*
* Based on: https://www.dfrobot.com/wiki/index.php/PM2.5_laser_dust_sensor_SKU:SEN0177
* Author：Zuyang @ HUST
* Modified by Cain for Arduino Hardware Serial port compatibility
* Datasheet: https://github.com/Arduinolibrary/DFRobot_PM2.5_Sensor_module/raw/master/HK-A5%20Laser%20PM2.5%20Sensor%20V1.0.pdf
* Contribution: epierre
*
* The dust sensor used (see purchase guide for latest link):
*/
#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;
float PM01Value;
float PM10_0Value;
float PM2_5Value;
float ppmv2_5;
float ppmv10_0;
float ppmv1_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
long ppmv;
#define LENG 31 //0x42 + 31 bytes equal to 32 bytes
unsigned char buf[LENG];
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 DFROBOT HK-A5", "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(9600); //use serial0
Serial.setTimeout(1500); //set the Timeout to 1500ms, longer than the data transmission periodic time of the sensor
}
void loop()
{
if(Serial.find(0x42)){ //start to read when detect 0x42
Serial.readBytes(buf,LENG);
if(buf[0] == 0x4d){
if(checkValue(buf,LENG)){
PM01Value=transmitPM01(buf); //count PM1.0 value of the air detector module
PM2_5Value=transmitPM2_5(buf);//count PM2.5 value of the air detector module
PM10_0Value=transmitPM10(buf); //count PM10 value of the air detector module
//ppmv=mg/m3 * (0.08205*Tmp)/Molecular_mass
//0.08205 = Universal gas constant in atm·m3/(kmol·K)
ppmv2_5=(PM2_5Value*0.0283168/100/1000) * (0.08205*temp)/0.01;
//ppmv=mg/m3 * (0.08205*Tmp)/Molecular_mass
//0.08205 = Universal gas constant in atm·m3/(kmol·K)
ppmv10_0=(PM10_0Value*0.0283168/100/1000) * (0.08205*temp)/0.01;
}
}
}
if ((ceil(ppmv2_5) != lastDUSTPM25)&&((long)ppmv2_5>0)) {
gw.send(dustMsgPM25.set((long)ppmv2_5));
lastDUSTPM25 = ceil(ppmv2_5);
}
if ((ceil(ppmv10_0) != lastDUSTPM10)&&((long)ppmv10_0>0)) {
gw.send(dustMsgPM10.set((long)ppmv10_0));
lastDUSTPM10 = ceil(ppmv10_0);
}
//sleep to save on radio
gw.sleep(SLEEP_TIME);
static unsigned long OledTimer=millis();
if (millis() - OledTimer >=1000)
{
OledTimer=millis();
Serial.print("PM1.0: ");
Serial.print(PM01Value);
Serial.println(" ug/m3");
Serial.print("PM2.5: ");
Serial.print(PM2_5Value);
Serial.println(" ug/m3");
Serial.print("PM1 0: ");
Serial.print(PM10_0Value);
Serial.println(" ug/m3");
Serial.println();
}
}
float conversion25(long concentrationPM25) {
double pi = 3.14159;
double density = 1.65 * pow (10, 12);
double r25 = 0.44 * pow (10, -6);
double vol25 = (4/3) * pi * pow (r25, 3);
double mass25 = density * vol25;
double K = 3531.5;
return (concentrationPM25) * K * mass25;
}
float conversion10(long concentrationPM10) {
double pi = 3.14159;
double density = 1.65 * pow (10, 12);
double r10 = 0.44 * pow (10, -6);
double vol10 = (4/3) * pi * pow (r10, 3);
double mass10 = density * vol10;
double K = 3531.5;
return (concentrationPM10) * K * mass10;
}
char checkValue(unsigned char *thebuf, char leng)
{
char receiveflag=0;
int receiveSum=0;
for(int i=0; i<(leng-2); i++){
receiveSum=receiveSum+thebuf[i];
}
receiveSum=receiveSum + 0x42;
if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the serial data
{
receiveSum = 0;
receiveflag = 1;
}
return receiveflag;
}
int transmitPM01(unsigned char *thebuf)
{
int PM01Val;
PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
return PM01Val;
}
//transmit PM Value to PC
int transmitPM2_5(unsigned char *thebuf)
{
int PM2_5Val;
PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
return PM2_5Val;
}
//transmit PM Value to PC
int transmitPM10(unsigned char *thebuf)
{
int PM10Val;
PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
return PM10Val;
}