mirror of
https://github.com/miguel5612/MQSensorsLib.git
synced 2025-03-15 05:17:30 +03:00
79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
// This is an example of implementation using ESP8266
|
|
// Never connect the sensor direct to the ESP8266, sensor high level is 5V
|
|
// ADC of ESP8266 high level is 3.3
|
|
// To connect use a voltage divisor, where 5V will 3v3 on the middle point like
|
|
// this {{URL}}
|
|
|
|
/*
|
|
MQUnifiedsensor Library - reading an MQSensor using ESP8266 board
|
|
|
|
For this example wi will demonstrates the use a MQ3 sensor.
|
|
Library originally added 01 may 2019
|
|
by Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez
|
|
|
|
Added ESP8266 example
|
|
29.03.2020
|
|
Wiring:
|
|
https://github.com/miguel5612/MQSensorsLib_Docs/blob/master/static/img/MQ_ESP8266.PNG
|
|
|
|
This example code is in the public domain.
|
|
|
|
*/
|
|
|
|
//Include the library
|
|
#include <MQUnifiedsensor.h>
|
|
|
|
//Definitions
|
|
#define placa "ESP8266" //NodeMcu, WeMos D1, TTGo, ESP32.. etc
|
|
#define Voltage_Resolution 3.3
|
|
#define pin A0 //Analog input 0 of your ESP Board
|
|
#define type "MQ-3" //MQ3
|
|
#define ADC_Bit_Resolution 10 // For ESP8266
|
|
|
|
//Declare Sensor
|
|
MQUnifiedsensor MQ3(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
|
|
|
|
//Set math model to calculate the PPM concentration and the value of constants
|
|
MQ3.setRegressionMethod(1); //_PPM = a*ratio^b
|
|
MQ3.setA(4.8387); MQ3.setB(-2.68); // Configurate the ecuation values to get Benzene concentration
|
|
/*
|
|
Exponential regression:
|
|
Gas | a | b
|
|
LPG | 44771 | -3.245
|
|
CH4 | 2*10^31| 19.01
|
|
CO | 521853 | -3.821
|
|
Alcohol| 0.3934 | -1.504
|
|
Benzene| 4.8387 | -2.68
|
|
Hexane | 7585.3 | -2.849
|
|
*/
|
|
|
|
// Calibration setup
|
|
MQ3.setR0(3.86018237);
|
|
|
|
/*
|
|
//If the RL value is different from 10K please assign your RL value with the following method:
|
|
MQ3.setRL(10);
|
|
*/
|
|
|
|
/***************************** MQ Init ********************************************/
|
|
//Remarks: Configure the pin of arduino as input.
|
|
/************************************************************************************/
|
|
MQ3.init();
|
|
/***************************** MQ Init ********************************************/
|
|
//Input: setup flag, if this function are on setup will print the headers (Optional - Default value: False)
|
|
//Output: print on serial port the information about sensor and sensor readings
|
|
//Remarks: Configure the pin of arduino as input.
|
|
/************************************************************************************/
|
|
MQ3.serialDebug(true);
|
|
}
|
|
|
|
void loop() {
|
|
MQ3.update(); // Update data, the arduino will be read the voltage on the analog pin
|
|
MQ3.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
|
|
MQ3.serialDebug(); // Will print the table on the serial port
|
|
delay(500); //Sampling frequency
|
|
} |