SeeedStudio Grove Infrared Reflective Sensor v12

Grove - Infrared Reflective Sensor v1.2 can be used for detection of proximity and color of objects. The reflective photosensor - RPR-220 used in this module consists of an infrared light emitting diode and a high ¨Csensitivity phototransistor. Light-colored objects directly in front of the sensor will reflect more infrared light as well as generate more current in the phototransistor than an object with dark-colored surfaces, this can be tell from a built-in indicator LED which will turn red with sufficient flow of current. Also, the intensity of the reflective light increases as the object getting closer. You can adjust the potential-meter on the back of the board if you want to detect a specific object (eg. Black line) at a certain distance. This sensor is a widely used in applications such as line-following robots, rotary speed detection, auto-data logging on utility meters or other situations where color or distance contrast is sharp. Features Panel-mounting Grove interface Digital output: 0 or VCC Built-in indicator LED Threshold adjustable via potentiometer Power supply: 3.5 ¨C 5.5V DC Reflective Photosensor: RPR-220 Effective working distance: 4-15mm Minimum detectable width for monochrome lines: 10mm Connector: 4 pin Buckled Grove interface Dimension: 20mm*20mm