This instructable is about making an inexpensive and a highly accurate air quality sensor named AEROBOT. This project shows temperature,relative humidity, PM 2.5 dust density and alerts about the air quality of the surroundings. It uses a DHT11 sensor for temperature and relative humidity, a sharp optical dust sensor for dust density and an ultrasonic sensor to inform users about inaccurate readings due to blocking of the sensor.
Via F. Thunus