#include "MQ7.h" MQ7::MQ7(uint8_t pin) : BaseMQ(pin) { } MQ7::MQ7(uint8_t pin, uint8_t pinHeater) : BaseMQ(pin, pinHeater) { } unsigned long MQ7::readCarbonMonoxide() { return readPpm(-0.77, 3.38); } int MQ7::readPpm(float a, float b) { float ratio = readRs()/_ro; return pow(M_E, (log(ratio)-b)/a); }