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70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
/*
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MQUnifiedsensor Library - calibrating an MQ2
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Demonstrates the use a MQ2 sensor.
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Library originally added 01 may 2019
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by Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez
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Added example
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modified 27 May 2019
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by Miguel Califa
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This example code is in the public domain.
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*/
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//Include the library
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#include <MQUnifiedsensor.h>
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//Definitions
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#define placa "Arduino UNO"
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#define Voltage_Resolution 5
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#define pin A0 //Analog input 0 of your arduino
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#define type "MQ-2" //MQ2
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#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
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//Defaults, uncomment if you need
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#define RatioMQ2CleanAir 9.83 //RS / R0 = 9.83 ppm
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//#define RatioMQ3CleanAir 60 //RS / R0 = 60 ppm
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//#define RatioMQ4CleanAir 4.4 //RS / R0 = 4.4 ppm
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//#define RatioMQ5CleanAir 6.5 //RS / R0 = 6.5 ppm
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//#define RatioMQ6CleanAir 10 //RS / R0 = 10 ppm
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//#define RatioMQ7CleanAir 27.5 //RS / R0 = 27.5 ppm
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//#define RatioMQ8CleanAir 70 //RS / R0 = 70 ppm
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//#define RatioMQ9CleanAir 9.6 //RS / R0 = 9.6 ppm
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//#define RatioMQ131CleanAir 15 //RS / R0 = 15 ppm
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//#define RatioMQ135CleanAir 3.6//RS / R0 = 3.6 ppm
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//#define RatioMQ303CleanAir 1 //RS / R0 = 1 ppm
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//#define RatioMQ309CleanAir 11 //RS / R0 = 11 ppm
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//Declare Sensor
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MQUnifiedsensor MQ2(placa, Voltage_Resolution, ADC_Bit_Resolution, pin2, type);
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unsigned long contador = 0;
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void setup() {
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//Init serial port
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Serial.begin(115200);
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MQ2.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ2.setA(574.25); MQ2.setB(-2.222); // Configurate the ecuation values to get LPG concentration
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//init the sensor
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MQ2.init();
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//Print in serial monitor
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Serial.print("MQ2 - Calibracion");
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Serial.print("Note - Make sure you are in a clean room and the sensor has pre-heated almost 4 hours");
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Serial.print("Autonumeric, lecture");
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}
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void loop() {
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//Read the sensor and print in serial port
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int lecture = MQ2.calibrate(RatioMQ2CleanAir);
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//Print in serial monitor
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Serial.print(String(contador) + ",");
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Serial.println(lecture);
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//Increment counter
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contador++;
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//Wait to measure next sample
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delay(400);
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}
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