************************************************************************************************************************************************ MQ sensor reading library for arduino Note: remember that all the parameters below can be modified during the program execution with the methods: setR0, setRL, setA, setB where you will have to send as parameter the new value, example: MQ4.setR0(20); //R0 = 20K Authors: Miguel A. Califa U - Yersson R. Carrillo A - Ghiordy F. Contreras C Contributors: Andres A. Martinez - Juan A. Rodríguez - Mario A. Rodríguez O Sensor: MQ-4 | MQ-5 Supply voltage: 5V R0: - Sin determinar - RL: 10KOhm Model: Logarithmic regression with parameters. MQ-4: a = 10000 | b = 50000 MQ-5: a = 10000 | b = 50000 Development board: Arduino |---------- MQ-4 ----------|---------- MQ-5 ----------| |ADC_In | Voltage_ADC | Resistance_RS | Ratio (RS/R0) | PPM |ADC_In | Voltage_ADC | Resistance_RS | Ratio (RS/R0) | PPM | ***************************************************************************************************************************************** | 224 | 1.09375 | RS = 1.07K | Ratio = .123K | 100000 PPM | 224 | 1.09375 | RS = 1.07K | Ratio = .123K | 100000 PPM |