TrungKuro / MQ-135_Arduino

MQ135 Air Quality Sensor Library

Library sensor MQ-135 for boards Arduino

Constructors

MQ135(uint8_t pin, bool isPower5v=true, float res2=2000);

• pin : the pin Analog connect
• isPower5v: the level logic of sensor (default 5v)
• res2 : the resistor R2 base on Schematic (default 2kΩ)

Methods

Need calculate RO before used, wait ~20s

void begin();

Calculate value, with unit selected

void readAirQuality(uint8_t unit=PPM);

• unit: select unit, default (ppm)
  • PERCENT_AIR (%)
  • PPM (ppm)

Attributes

Read value with range of Max/Min

+ air.max
+ air.min