ITEM NAME:2pcs KY-040 Rotary Encoder Module for Arduino AVR PIC NEW Bj.With the buttons on the rotary encoder can be reset to its initial state, that starts counting from 0. Reading system of alternating light transmitting window and the window is not consisting of radial indexing plate (code wheel) rotating basis, while being an infrared light source vertical irradiation light to the code disk image onto the receiving on the surface.
