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What is the function of 74ls 18 1?
74LS 18 1 is a 2-input and 4-output encoder. By inputting 0~ 15, it outputs 0000 ~11coded chips. The 74ls 18 1 chip consists of 22 pins, including 8 data input terminals.

These eight are all active low. It also includes four control terminals S0, S 1, S2 and S3, which mainly control the operation of two channels of four-bit input data.

Extended data:

According to the detection principle, encoders can be divided into optical, magnetic, inductive and capacitive types. According to its calibration method and signal output form, it can be divided into incremental, absolute and mixed types. (representative)

The common photoelectric encoder consists of grating disk, light-emitting element and photosensitive element. Grating is actually a disc engraved with regular light transmission and light transmission. The luminous flux received by the photosensitive element changes synchronously with the transmitted light. The output waveform of the photosensitive element becomes a pulse signal after shaping, and one pulse is output every turn. According to the change of pulse, the displacement of equipment can be measured and controlled accurately.