KY-040 360 Degrees Rotary Encoder Switch Module Brick Sensor Development KY040 Potentiometer Knob Kit Fit for Arduino

The KY-040 is a solid entry-level rotary encoder for basic Arduino projects, delivering reliable 360-degree rotation detection with tactile feedback. The module integrates the encoder, push-button, and pull-up resistors on a compact PCB, eliminating messy breadboard wiring. I confirmed stable CLK/DT signal generation across multiple rotation speeds and clean debouncing on the switch output. However, the mechanical feel is noticeably cheaper than industrial alternatives—detent positions are inconsistent, and the included plastic knob has visible play. Signal noise required basic software filtering in my tests. Build quality matches the price point; it's adequate for learning but won't survive heavy-duty applications.