Optical Tracking Sensor Board Feature An optical tracking sensor board using PAT9125EL-TKIT manufactured by PixArt Imaging. It is possible to detect two-dimensional movement with one sensor. It can detect object movement at a distance of 1 to 30 mm. No additional lens is required. Programmable resolution up to 1,275cpi. It can be easily connected via I2C (Grove compatible connector). This board is equipped with voltage level conversion, so it can be directly connected to 5V systems such as Arduino Uno. Application Tracking on a Moving Surface Tracking on the Side of a Rotational Shaft Note Power/I2C 3.3V-5V This board is equipped with the PAT9125EL-TKIT, which is an I2C connection type, and does not support SPI connection.