So I have written this article for beginners, to illustrate how even simple algorithms need some thought. In writing the code, I realized that even something as simple as a running average algorithm requires some thought to writing it well. I want to get the _PPM alone in my loop so I can add it to my osc message.I needed a running average to monitor CPU utilization and ended up writing a small class for doing the calculation. MQ8.serialDebug() // Will print the table on the serial port !!!!!!!!!!!!!!!!! this is the table !!!!!įrom 63 till 103 is the part that prints the table. MQ8.readSensor() // Sensor will read PPM concentration using the model and a and b values setted before or in the setup MQ8.update() // Update data, the arduino will be read the voltage on the analog pinĬalcR0 += MQ8.calibrate(RatioMQ8CleanAir) Serial.print("Calibrating please wait.") This routine not need to execute to every restart, you can load your R0 if you know the value
We recomend execute this routine only on setup or on the laboratory and save on the eeprom of your arduino and now is on clean air (Calibration conditions), and it will setup R0 value. In this routine the sensor will measure the resistance of the sensor supposing before was pre-heated If the RL value is different from 10K please assign your RL value with the following method: Remarks: Configure the pin of arduino as input. MQ8.setA(976.97) MQ8.setB(-0.688) // Configurate the ecuation values to get H2 concentration MQ8.setRegressionMethod(1) //_PPM = a*ratio^b Set math model to calculate the PPM concentration and the value of constants Init the serial port communication - to debug the library MQUnifiedsensor MQ8(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type)
#define calibration_button 13 //Pin to calibrate your sensor #define RatioMQ8CleanAir 70 //RS / R0 = 70 ppm #define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO #define pin A0 //Analog input 0 of your arduino This example code is in the public domain. Please take care, arduino A0 pin represent the analog input configured on #define pin I only need the PPM for my project as I want to send this as an osc message.īut the code of the library is made up so I can only use the whole data table instead of the ppm.īy Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez I’m using this working library to extract H2 & Alcohol in PPM from sensors.
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