KY-040 Rotary Encoder Module
A compact incremental rotary encoder module with quadrature CLK and DT outputs plus an integrated momentary push switch. The five-pin interface exposes CLK, DT, SW, supply, and ground for breadboard-friendly user input.
Pinout
- VCC
Logic supply. Use 3.3V with 3.3V microcontrollers.
Type · PowerVoltage · 3.3 - GND
Ground reference.
Type · Ground - CLK
Quadrature encoder channel A.
Type · GPIO - DT
Quadrature encoder channel B.
Type · GPIO - SW
Integrated momentary push switch output.
Type · GPIO
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VCC | Power | Logic supply. Use 3.3V with 3.3V microcontrollers. | 3.3 |
| GND | Ground | Ground reference. | |
| CLK | GPIO | Quadrature encoder channel A. | |
| DT | GPIO | Quadrature encoder channel B. | |
| SW | GPIO | Integrated momentary push switch output. |
Pin details
5 connections- VCC
Logic supply. Use 3.3V with 3.3V microcontrollers.
PowerVoltage · 3.3 - GND
Ground reference.
Ground - CLK
Quadrature encoder channel A.
GPIO - DT
Quadrature encoder channel B.
GPIO - SW
Integrated momentary push switch output.
GPIO
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