A sensor is a device that detects and responds to some type of input from the physical environment. Inputs can be light, heat, motion, humidity, etc. This is our self-developed microbit sensor series, named Octopus Sensors. This sensor series has many cheap and powerful sensors, such as light sensor, pir sensor, soil Moisture sensor, etc. Compatible with other types of extended versions on the market. Find the sensor that best matches your STEM project at ELECFREAKS! We also have another sensor series called PlanetX Sensor. You can click to find out.