The HC-020K Speed encoder is a compact module with encoder disk to measure the speed of a motor. The encoder disk of 24 mm has 20 openings and fits on a D type shaft of 4 mm. Furthermore, the module operates on 5V and indicates with a frequency of 100kHz whether there is an opening of the encoder in front of the reader or not. https://elecena.pl/product/27739076/opencircuit-hc-020k-speed-encoder 2025-01-22 https://elecena.pl/product/27739076/opencircuit-hc-020k-speed-encoder 2026-02-20 https://elecena.pl/product/27739076/opencircuit-hc-020k-speed-encoder 2026-02-23 https://elecena.pl/product/27739076/opencircuit-hc-020k-speed-encoder 2026-02-25