A rotary encoder gives a number of pulses when the knob is turned. The rotary encoder on this module gives 20 pulses when the knob is turned 360 degrees, which means that a pulse is delivered every 18 degrees. The rotary encoder can also be 'pressed', for example to select a menu option. The module is supplied without connection ring and nut. https://elecena.pl/product/27738370/opencircuit-rotary-encoder-module-ky-40 2025-01-22 https://elecena.pl/product/27738370/opencircuit-rotary-encoder-module-ky-40 2026-01-27 https://elecena.pl/product/27738370/opencircuit-rotary-encoder-module-ky-40 2026-01-30 https://elecena.pl/product/27738370/opencircuit-rotary-encoder-module-ky-40 2026-02-15 https://elecena.pl/product/27738370/opencircuit-rotary-encoder-module-ky-40 2026-02-17 https://elecena.pl/product/27738370/opencircuit-rotary-encoder-module-ky-40 2026-02-20 https://elecena.pl/product/27738370/opencircuit-rotary-encoder-module-ky-40 2026-04-14