Question: combining code for PMS7003 into Aircasting code

vinushi1995 is asking a question about air-quality: Subscribe to answer questions on this topic

vinushi1995 asked on August 11, 2019 07:50
115 views | 0 answers | #20501


hello,

I am making an air quality sensor using the aircasting app. according to the instructions given at http://habitatmap.org/habitatmap_docs/HowToBuildAnAirCastingAirMonitor.pdf . howver i'm adding the pms7003 sensor as an extra.

this is the pms7003 sesnor code which works well separately

include

SoftwareSerial pmsSerial(8, 9);

void setup() { // our debugging output Serial.begin(115200);

// sensor baud rate is 9600 pmsSerial.begin(9600); }

struct pms5003data { uint16_t framelen; uint16_t pm10_standard, pm25_standard, pm100_standard; uint16_t pm10_env, pm25_env, pm100_env; uint16_t particles_03um, particles_05um, particles_10um, particles_25um, particles_50um, particles_100um; uint16_t unused; uint16_t checksum; };

struct pms5003data data;

void loop() { if (readPMSdata(&pmsSerial)) { // reading data was successful! Serial.println(); Serial.println("---------------------------------------"); Serial.println("Concentration Units (standard)"); Serial.print("PM 1.0: "); Serial.print(data.pm10_standard); Serial.print("\t\tPM 2.5: "); Serial.print(data.pm25_standard); Serial.print("\t\tPM 10: "); Serial.println(data.pm100_standard); Serial.println("---------------------------------------"); Serial.println("Concentration Units (environmental)"); Serial.print("PM 1.0: "); Serial.print(data.pm10_env); Serial.print("\t\tPM 2.5: "); Serial.print(data.pm25_env); Serial.print("\t\tPM 10: "); Serial.println(data.pm100_env); Serial.println("---------------------------------------"); Serial.print("Particles > 0.3um / 0.1L air:"); Serial.println(data.particles_03um); Serial.print("Particles > 0.5um / 0.1L air:"); Serial.println(data.particles_05um); Serial.print("Particles > 1.0um / 0.1L air:"); Serial.println(data.particles_10um); Serial.print("Particles > 2.5um / 0.1L air:"); Serial.println(data.particles_25um); Serial.print("Particles > 5.0um / 0.1L air:"); Serial.println(data.particles_50um); Serial.print("Particles > 10.0 um / 0.1L air:"); Serial.println(data.particles_100um); Serial.println("---------------------------------------"); delay(2000); } }

boolean readPMSdata(Stream *s) { if (! s->available()) { return false; }

// Read a byte at a time until we get to the special '0x42' start-byte if (s->peek() != 0x42) { s->read(); return false; }

// Now read all 32 bytes if (s->available() < 32) { return false; }

uint8_t buffer[32];
uint16_t sum = 0; s->readBytes(buffer, 32);

// get checksum ready for (uint8_t i=0; i<30; i++) { sum += buffer[i]; }

/ debugging for (uint8_t i=2; i<32; i++) { Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", "); } Serial.println(); /

// The data comes in endian'd, this solves it so it works on all platforms uint16_t buffer_u16[15]; for (uint8_t i=0; i<15; i++) { buffer_u16[i] = buffer[2 + i2 + 1]; buffer_u16[i] += (buffer[2 + i2] << 8); } ``` // put it into a nice struct :) memcpy((void )&data, (void )buffer_u16, 30);

if (sum != data.checksum) { Serial.println("Checksum failure"); return false; } // success! return true; }<30; i++) { sum += buffer[i]; }

/ debugging for (uint8_t i=2; i<32; i++) { Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", "); } Serial.println(); /

// The data comes in endian'd, this solves it so it works on all platforms uint16_t buffer_u16[15]; for (uint8_t i=0; i<15; i++) { buffer_u16[i] = buffer[2 + i2 + 1]; buffer_u16[i] += (buffer[2 + i2] << 8); } ```

however i tried to integrate this into the aircasting code and the values arent displayed. it always shows pm1.0 pm2.5 and pm10 all 3 as 0 or a very high equal value like 12600

here is the combined code i used.


#include 
#include  //Header for software serial communication
SoftwareSerial mySerial(2, 3); //Assign 2 as Rx and 3 as Tx
dht DHT;
#define DHT22_PIN 7

#include 
SoftwareSerial pmsSerial(8, 9);

float temp, humi, maxv, CO;
int   circ = 5, heat = 6;

void setup()
{
  Serial.begin(115200); //Serial communication for Arduino Serial Monitor
  mySerial.begin(115200); //Serial communcation for Aircasting Application
  pmsSerial.begin(9600);
  pinMode(circ, OUTPUT);
  pinMode(heat, OUTPUT);

}

//pms7003
struct pms5003data {
  uint16_t framelen;
  uint16_t pm10_standard, pm25_standard, pm100_standard;
  uint16_t pm10_env, pm25_env, pm100_env;
  uint16_t particles_03um, particles_05um, particles_10um, particles_25um, particles_50um, particles_100um;
  uint16_t unused;
  uint16_t checksum;
};

struct pms5003data data;

void loop()
{
 if (readPMSdata(&pmsSerial)) {
   Serial.print("PM 1.0: "); Serial.print(data.pm10_env);
    Serial.print("\t\tPM 2.5: "); Serial.print(data.pm25_env);
    Serial.print("\t\tPM 10: "); Serial.println(data.pm100_env);

    mySerial.print(data.pm10_env);
  mySerial.print(";InsertSensorPackageName;PMS7003-PM1.0;PM-1.0;data.pm10_env;response indicator;RI;0;25;50;75;100");
  mySerial.print("\n");

  mySerial.print(data.pm25_env);
  mySerial.print(";InsertSensorPackageName;PMS7003-PM2.5;PM-2.5;data.pm25_env;response indicator;RI;0;25;50;75;100");
  mySerial.print("\n");

    mySerial.print(data.pm25_env);
  mySerial.print(";InsertSensorPackageName;PMS7003-PM10;PM-10;data.pm100_env;response indicator;RI;0;25;50;75;100");
  mySerial.print("\n");
 }


  //call up the calculation functions
  GetCO();

  Serial.println();


//pms7003

   Serial.print("PM 1.0: "); Serial.print(data.pm10_env);
    Serial.print("\t\tPM 2.5: "); Serial.print(data.pm25_env);
    Serial.print("\t\tPM 10: "); Serial.println(data.pm100_env);

    mySerial.print(data.pm10_env);
  mySerial.print(";InsertSensorPackageName;PMS7003-PM1.0;PM-1.0;data.pm10_env;response indicator;RI;0;25;50;75;100");
  mySerial.print("\n");

  mySerial.print(data.pm25_env);
  mySerial.print(";InsertSensorPackageName;PMS7003-PM2.5;PM-2.5;data.pm25_env;response indicator;RI;0;25;50;75;100");
  mySerial.print("\n");

    mySerial.print(data.pm25_env);
  mySerial.print(";InsertSensorPackageName;PMS7003-PM10;PM-10;data.pm100_env;response indicator;RI;0;25;50;75;100");
  mySerial.print("\n");

  //Display of CO gas sensor
  mySerial.print(CO);
  mySerial.print(";InsertSensorPackageName;TGS2442;CO Gas;CO;response indicator;RI;0;25;50;75;100");
  mySerial.print("\n");
  Serial.print("CO Gas: ");
  Serial.print(CO);
  Serial.print("% ");
  Serial.println();



  //temp sensor
   int chk = DHT.read22(DHT22_PIN);
  temp = DHT.temperature;
  mySerial.print(temp);
  mySerial.print(";InsertSensorPackageName;DHT22-Temp;Temperature;temp;response indicator;RI;0;10;20;30;40");
  mySerial.print("\n");
  Serial.print("Temperature=");
  Serial.print(temp);
  Serial.println();

  //Display of Humidity Sensor
   humi = DHT.humidity;
  mySerial.print(humi);
  mySerial.print(";InsertSensorPackageName;DHT22-Humi;Humidity;humi;response indicator;RI;0;25;50;75;100");
  mySerial.print("\n");
  Serial.print("Humidity=");
  Serial.print(humi);
  Serial.println();


//MQ9 sensor
float sensor_volt, RS_gas, ratio;
float R0 = 0.40; 
  float sensorValue = analogRead(A0); 
  sensor_volt = ((float)sensorValue / 1024) * 5.0; 
  RS_gas = (5.0 - sensor_volt) / sensor_volt; // Depend on RL on yor module 
  ratio = RS_gas / R0; // ratio = RS/R0 

 //Display of MQ-9 Gas Sensor
  mySerial.print(ratio);
  mySerial.print(";InsertSensorPackageName;MQ9;Gas;gas;response indicator;RI;0;2;5;7;10");
  mySerial.print("\n");
  Serial.print("Gas Ratio=");
  Serial.print(ratio);
  Serial.println();


delay(2000); //Delay of 1 second for ease of viewing 
}

boolean readPMSdata(Stream *s) {
  if (! s->available()) {
    return false;
  }

  // Read a byte at a time until we get to the special '0x42' start-byte
  if (s->peek() != 0x42) {
    s->read();
    return false;
  }

  // Now read all 32 bytes
  if (s->available() < 32) {
    return false;
  }

  uint8_t buffer[32];    
  uint16_t sum = 0;
  s->readBytes(buffer, 32);

  // get checksum ready
  for (uint8_t i=0; i<30; i++) {
    sum += buffer[i];
  }

  /* debugging
  for (uint8_t i=2; i<32; i++) {
    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
  }
  Serial.println();
  */

  // The data comes in endian'd, this solves it so it works on all platforms
  uint16_t buffer_u16[15];
  for (uint8_t i=0; i<15; i++) {
    buffer_u16[i] = buffer[2 + i*2 + 1];
    buffer_u16[i] += (buffer[2 + i*2] << 8);
  }

  // put it into a nice struct :)
  memcpy((void *)&data, (void *)buffer_u16, 30);

  if (sum != data.checksum) {
    Serial.println("Checksum failure");
    return false;
  }
  // success!
  return true;
}
void GetCO()
{
  digitalWrite(circ, LOW);
  analogWrite(heat, 245);
  delay(14);
  analogWrite(heat, 0);
  delay(981);
  digitalWrite(circ, HIGH);
  delay(3);
  float val1 = analogRead(A1);
  CO = map(val1, 0 , 1023, 0, 100);
}

float map(float x, float in_min, float in_max, float out_min, float out_max)
{
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
<br>


2 Comments

@liz awards a barnstar to vinushi1995 for their awesome contribution!

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Wow @vinushi1995 - great documentation! This will really help people! In case the URL ever changes, i'm uploading a local copy of the PDF instructions from AirCasting here: HowToBuildAnAirCastingAirMonitor.pdf

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