hello, so i have a device which measure air quality , i have mq131 mq135 dht11 dsm501 with arduino mega , i used a lcd with a i2c connector to it but , i cant get the code to update the dsm501 data in lcd , can someone help??
/*
MQUnifiedsensor Library - reading an MQ135
Demonstrates the use a MQ135 sensor.
Library originally added 01 may 2019
by Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez
Added example
modified 23 May 2019
by Miguel Califa
Updated library usage
modified 26 March 2020
by Miguel Califa
Wiring:
https://github.com/miguel5612/MQSensorsLib_Docs/blob/master/static/img/MQ_Arduino.PNG
Please make sure arduino A0 pin represents the analog input configured on #define pin
This example code is in the public domain.
*/
//Include the library
#include <MQUnifiedsensor.h>
#include <MQUnifiedsensor.h>
#include "DHT.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,28,4);
//Definitions
#define DHTPIN 52 // paye data sensor be 4 arduino vasl shode
#define DHTTYPE DHT11 // DHT 11
#define placa "Arduino MEGA"
#define Voltage_Resolution 5
#define pin A0 //Analog input 0 of your arduino
#define type "MQ-135" //MQ135
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
#define RatioMQ135CleanAir 3.6//RS / R0 = 3.6 ppm
#define pindng A1
#define typesty "MQ-131"
#define RatioMQ131CleanAir 15
int pin2 = 3;
int pin1 = 2;
unsigned long duration1;
unsigned long duration2;
unsigned long starttime;
unsigned long sampletime_ms = 3000;//sampe 1s ;
unsigned long lowpulseoccupancy1 = 0;
unsigned long lowpulseoccupancy2 = 0;
float ratio1 = 0;
float ratio2 = 0;
float concentration1 = 0;
float concentration2 = 0;
//#define calibration_button 13 //Pin to calibrate your sensor
//Declare Sensor
MQUnifiedsensor MQ131(placa, Voltage_Resolution, ADC_Bit_Resolution, pindng, typesty);
DHT dht(DHTPIN, DHTTYPE);//sakht class
MQUnifiedsensor MQ135(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
void setup() {
//Init the serial port communication - to debug the library
Serial.begin(9600); //Init serial port
pinMode(2,INPUT);
pinMode(3,INPUT);
starttime = millis();//get the current time;
MQ131.setRegressionMethod(1); //_PPM = a*ratio^b
dht.begin();
//Set math model to calculate the PPM concentration and the value of constants
MQ135.setRegressionMethod(1); //_PPM = a*ratio^b
/***************************** MQ Init ********************************************/
//Remarks: Configure the pin of arduino as input.
/************************************************************************************/
MQ131.init();
MQ135.init();
lcd.init(); // initialize the lcd
lcd.init();
lcd.backlight();
lcd.setCursor(0,0);
/*
//If the RL value is different from 10K please assign your RL value with the following method:
MQ135.setRL(10);
*/
/***************************** MQ CAlibration ********************************************/
// Explanation:
// In this routine the sensor will measure the resistance of the sensor supposedly before being pre-heated
// and on clean air (Calibration conditions), setting up R0 value.
// We recomend executing this routine only on setup in laboratory conditions.
// This routine does not need to be executed on each restart, you can load your R0 value from eeprom.
// Acknowledgements: https://jayconsystems.com/blog/understanding-a-gas-sensor
Serial.print("Calibrating please wait.");
float calcR0 = 0;
float calcR01 = 0;
for(int i = 1; i<=10; i ++)
{
MQ135.update(); // Update data, the arduino will read the voltage from the analog pin
calcR0 += MQ135.calibrate(RatioMQ135CleanAir);
MQ131.update(); // Update data, the arduino will read the voltage from the analog pin
calcR01 += MQ131.calibrate(RatioMQ131CleanAir);
Serial.print(".");
}
Serial.print("\n");
MQ135.setR0(calcR0/10);
MQ131.setR0(calcR01/10);
if(isinf(calcR0)) {Serial.println("Warning: Conection issue, R0 is infinite (Open circuit detected) please check your wiring and supply"); while(1);}
if(calcR0 == 0){Serial.println("Warning: Conection issue found, R0 is zero (Analog pin shorts to ground) please check your wiring and supply"); while(1);}
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
/***************************** MQ CAlibration ********************************************/
}
void loop() {
duration1 = pulseIn(pin1, LOW);
duration2 = pulseIn(pin2, LOW);
lowpulseoccupancy1 = lowpulseoccupancy1+duration1;
lowpulseoccupancy2 = lowpulseoccupancy2+duration2;
if ((millis()-starttime) > sampletime_ms)//if the sampel time == 30s
{
ratio1 = lowpulseoccupancy1/(sampletime_ms*10.0); // Integer percentage 0=>100
concentration1 = 1.1*pow(ratio1,3)-3.8*pow(ratio1,2)+520*ratio1+0.62; // using spec sheet curve
ratio2 = lowpulseoccupancy2/(sampletime_ms*10.0); // Integer percentage 0=>100
concentration2 = 1.1*pow(ratio2,3)-3.8*pow(ratio2,2)+520*ratio2+0.62; //
lowpulseoccupancy1 = 0;
lowpulseoccupancy2 = 0;
starttime = millis();
}
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
Serial.println("Sampling...");
MQ135.update(); // Update data, the arduino will read the voltage from the analog pin
MQ135.setA(605.18); MQ135.setB(-3.937); // Configure the equation to calculate CO concentration value
float CO = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
MQ135.setA(77.255); MQ135.setB(-3.18); //Configure the equation to calculate Alcohol concentration value
float Alcohol = MQ135.readSensor(); // SSensor will read PPM concentration using the model, a and b values set previously or from the setup
MQ135.setA(110.47); MQ135.setB(-2.862); // Configure the equation to calculate CO2 concentration value
float CO2 = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
MQ135.setA(44.947); MQ135.setB(-3.445); // Configure the equation to calculate Toluen concentration value
float Toluen = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
MQ135.setA(102.2 ); MQ135.setB(-2.473); // Configure the equation to calculate NH4 concentration value
float NH4 = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
MQ135.setA(34.668); MQ135.setB(-3.369); // Configure the equation to calculate Aceton concentration value
float Aceton = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
MQ131.setA(23.943); MQ131.setB(-1.11); // Configure the equation to to calculate O3 concentration
MQ131.update(); // Update data, the arduino will read the voltage from the analog pin
MQ131.readSensorR0Rs(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
// Will print the table on the serial port
float O3 = MQ131.readSensorR0Rs();
MQ131.setA(-462.43); MQ131.setB(-2.204);
MQ131.update();
MQ131.readSensorR0Rs();
float NOx = MQ131.readSensorR0Rs();
MQ131.setA(47.209); MQ131.setB(-1.186);
MQ131.update();
MQ131.readSensorR0Rs();
float CL2 = MQ131.readSensorR0Rs();
// Note: 400 Offset for CO2 source: https://github.com/miguel5612/MQSensorsLib/issues/29
/*
Motivation:
We have added 400 PPM because when the library is calibrated it assumes the current state of the
air as 0 PPM, and it is considered today that the CO2 present in the atmosphere is around 400 PPM.
https://www.lavanguardia.com/natural/20190514/462242832581/concentracion-dioxido-cabono-co2-atmosfera-bate-record-historia-humanidad.html
*/
/*
Exponential regression:
GAS | a | b
CO | 605.18 | -3.937
Alcohol | 77.255 | -3.18
CO2 | 110.47 | -2.862
Toluen | 44.947 | -3.445
NH4 | 102.2 | -2.473
Aceton | 34.668 | -3.369
*/
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Sampling...");
delay(10000);
Serial.print("Humidity: ");
Serial.print(h);
Serial.print("%");
Serial.print(" | ");
lcd.setCursor(0,0);
lcd.clear();
lcd.print("Humidity: ");
lcd.print(h);
lcd.print("%");
lcd.setCursor(0,1);
lcd.print("Temp: ");
lcd.print(t);
lcd.print(" *C");
delay(5000);
lcd.clear();
lcd.print("CO: ");
lcd.print(CO);
lcd.print(" PPM");
lcd.setCursor(0,1);
lcd.print("CO2: ");
lcd.print(CO2+400);
lcd.print(" PPM");
delay(5000);
lcd.clear();
lcd.print("O3: ");
lcd.print(O3);
lcd.print(" PPM");
lcd.setCursor(0,1);
lcd.print("CL2: ");
lcd.print(CL2);
lcd.print(" PPM");
delay(5000);
lcd.clear();
lcd.print("Aceton: ");
lcd.print(Aceton);
lcd.print(" PPM");
lcd.setCursor(0,1);
lcd.print("Toluen: ");
lcd.print(Toluen);
lcd.print(" PPM");
delay(5000);
lcd.clear();
lcd.print("NH4: ");
lcd.print(NH4);
lcd.print(" PPM");
lcd.setCursor(0,1);
lcd.print("NOx: ");
lcd.print(NOx);
lcd.print(" PPM");
for (int i = 1; i <= 7; ++i) {
lowpulseoccupancy1 = 0;
lowpulseoccupancy2 = 0;
starttime = millis();
delay(5000);
lcd.clear();
lcd.print("PM10: ");
lcd.print(concentration1,3);
lcd.setCursor(0,1);
lcd.print("conc1 = ");
lcd.print(concentration1);
lcd.setCursor(0,2);
lcd.print("conc2 = ");
lcd.print(concentration2);
}
Serial.print("Temperature: ");
Serial.print(t);
Serial.print(" *C ");
Serial.print(" | ");
Serial.print("Heat index: ");
Serial.print(hic);
Serial.print(" *C ");
Serial.print(" | ");
Serial.print("CO2:");
Serial.print(CO2+400);
Serial.print(" PPM");
Serial.print(" | ");
Serial.print("CO:");
Serial.print(CO);
Serial.print(" | ");
Serial.print("Alcohol: ");
Serial.print(Alcohol);
Serial.print(" PPM");
Serial.print(" | ");
Serial.print("Toluen: ");
Serial.print(Toluen);
Serial.print(" PPM");
Serial.print(" | ");
Serial.print("NH4: ");
Serial.print(NH4);
Serial.print(" PPM");
Serial.print(" | ");
Serial.print("Aceton: ");
Serial.print(Aceton);
Serial.print(" PPM");
Serial.print(" | ");
Serial.print("Ozone: ");
Serial.print(O3);
Serial.print(" PPM");
Serial.print(" | ");
Serial.print("CL2: ");
Serial.print(CL2);
Serial.print(" PPM");
Serial.print(" | ");
Serial.print("NOx: ");
Serial.print(NOx);
Serial.print(" PPM");
Serial.print("\n");
delay(5000); //Sampling frequency
}
