Features:Operating Voltage: 5VPulse Number for One Circle: 20Rotaryencoder can count the output pulse timeby rotating positively and negatively. This counting methodhas no limitation, it can resetand comeback to the initial status if matching with the keyon the encoder (that is to say itwill count from 0)Operating Principle: Incremental encoder is a kind of rotarysensor which transforms the rotations displacement into a series of digital pulsesignal. These pulses are used to control angulardisplacement. In Eltraencoder, the transformation of angulardisplacement adopts photoelectric scaning principle.The reading system is basedon the radialdividing plate rotations of alternative light window and nonlight window, and it will be exposed to infraredlight source at the sametime. The light will reflect the picture of plate on the surfaces of receiver. The receiver is coveredby a diffractiongrating, and it has the same window width with the plate. The operation of receiver is to detect the change of light plate rotations, then transform the light change into electric change. Increase the low level signal into high level and generate square pulse without any interference. This process needs circuit to deal with. The reading system usually adopts differential methods, that is compare two different signals who have the same waveform buthe phase difference is 180 degree so as to improve the output signal quality and stability. Reading is formed on the basis of the difference between two signals, so it eliminates the interference.Specifications:Material:PCBNote:Please allow 1mm errors due to manual measurement.Due to the difference between different monitors, the picture may not reflect the actual color of the item.Package includes:1x Rotary Encoder