Xd-88 360 Degree Rotary Encoder Module KY-040 FOR Module

KY-040 headphone encryption module







Working voltage: 5V



Number of pulses per turn: 20



The rotary encoder can count the number of output pulses during positive and negative rotation by rotating. Unlike potentiometers, the number of revolutions is unlimited. With the key on the rotary encoder, it is possible to reset back to the original state, that is, the counting starts from 0.


Rules of work:





The incremental encoder is a rotary sensor that converts the rotational displacement into a series of digital pulses. These pulses are used to control angular displacement. The angular displacement conversion in the Eltra encoder is based on the photoelectric scanning principle. The reading system is based on the rotation of a radial index plate (code plate) consisting of transparent windows and alternating translucent windows, and simultaneously vertically illuminated by an infrared light source, projecting the image. of the code plate on the surface of the receiver. The receiver is covered with a diffraction grating, which is the same width of the window as the encoding system. The receiver's job is to sense the changes due to the rotation of the disc and then convert those changes into the corresponding electrical changes. Raising the low-level signal to a higher level and generating a square pulse without any interference has to be electronically processed. The reading system usually adopts the differential method, comparing two different signals with the same waveform but with 180 ° phase displacement, to improve the quality and stability of the output signal. Reading is based on the difference between the two signals, thus eliminating the noise.

Incremental encryption:

The incremental encoder gives A two-phase square wave with A 90 ° phase difference, commonly referred to as channel A and channel B. One of the channels provides information regarding the rotation speed, at the same time, information. of the direction of rotation is obtained by sequential comparison of the signals of the two channels. There is also a special signal called the Z-channel or zero channel, which indicates the encoder's absolute zero value. This signal is a square wave that coincides with the center line of the square wave of channel A.

The encoder accuracy increases depending on mechanical and electrical factors, such as grating index error, optical eccentricity, bearing eccentricity, error introduced by electronic reading equipment. and optical part inaccuracy. The unit of measure to determine encoder accuracy is electronegativity, encoder accuracy determines the pulse division generated by the encoder. The rotation of the mechanical shaft should be a complete cycle of the following 360 ° electrical. To know how many mechanical angles correspond to electrical 360 degrees, the following formula can be used: Electric 360 = 360 ° mechanical / pulse / N ° rotation

Figure: A, B reversal signal





The coding indexing error is expressed as the maximu