The reflectivity of infrared light varies with the color and distance of the reflecting surface. According to this principle, Grove - Infrared Reflective Sensor utilizes a RPR220 reflective photosensor module to detect color and distance. When a light-colored object approaches,the signal intensity received by infrared reflective sensor increases and the indicator LED on board turns red. When a dark-colored object approaches, the intensity decreases and the LED turns off. This sensor is a basic and widely used part in applications such as line-following cars, rotary speed detection, auto data logging on utility meters or other situations where color or distance contrast is sharp. Features Operating voltage: 4.5 V - 5.5 V Digital output, 0 or VCC High resolution sensor;minimum detectable length: 1mm black line Effective distance：4-15mm Indicator LED on board Sensitivity adjustable via potentiometer Small Grove 1X1 compatible interface For all Grove users (especially beginners), we provide you guidance PDF documents. Please download and read through Preface - Getting Started and Introduction to Grove before your using of the product. Please visit our wiki page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials.
