This simple dust sensor is a great way to add basic particulate sensing to your next project. It's not as fully featured as our PM2.5 I2C/UART-based sensors, with just a single analog voltage output. However, for the price, it can't be beat! The SHARP GP2Y1014AU0F Dust Sensor Module Kit particulate sensor uses an LED to bounce off of particles suspended in the air - much like you can clearly see how dusty the air is when a sun beam lights up your room!