360 degree rotary encoder module KY-040

Detail 360 degree rotary encoder module KY-040

Arduino rotary encoder module KY-040


Operating voltage: 5V
Number of pulses: 20
The rotary encoder can count the number of pulses output in the forward and
reverse directions by rotation, and the rotation count is not like the
potentiometer. This rotation count is not limited. With the keys on the rotary
encoder, you can reset to the initial state, that is, counting from 0 .


working principle:

An incremental encoder is a rotary sensor that converts a rotary displacement
into a series of digital pulse signals. These pulses are used to control the
angular displacement. In EltraThe conversion of the angular displacement encoder
uses the principle of photoelectric scanning. The reading system is based on the
rotation of the radial indexing disc (code disc) consisting of alternating light
transmission windows and opacifying windows, and is irradiated vertically by an
infrared light source, and the image of the code is projected onto the receiver
surface The The receiver is covered with a layer of diffraction grating, which
has the same window width as the encoder. The work of the receiver is to feel
the changes that occur when the disc rotates, and then convert the light changes
to the corresponding electrical changes. And then the low level signal to a
higher level, and produce no interference with the square pulse, which must be
used to deal with electronic circuits. The reading system usually uses a
differential mode, which compares the two signals with the same waveform but
with a phase difference of 180 in order to improve the quality and stability of
the output signal. The readings are formed on the basis of the difference
between the two signals, thus eliminating the interference.

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