KY-040 Rotary Encoder Module with Push Button

Add rotary and push-button control to your Arduino project with the KY-040 rotary encoder module. Turn the shaft clockwise or anticlockwise to adjust values, and use the built-in button for a software-defined action such as selecting a menu item.

Applications

• Menu navigation and setting adjustments
• Digital counters and user controls
• Arduino learning, robotics and DIY electronics projects

Features

• Incremental rotation sensing in both directions
• Continuous rotation without a fixed end stop
• Integrated momentary push button
• Five labelled connection pins and two PCB mounting holes

Technical specifications

• Model: KY-040
• Product code: KY-040-NZ
• Encoder type: Incremental
• Resolution: 20 cycles per revolution
• Working voltage: 5V
• Dimensions: Approximately 32 x 19 x 30mm
• Module weight: Approximately 10g

Pin connections

• CLK: First rotation signal
• DT: Second rotation signal; read with CLK to determine direction
• SW: Push-button signal; connects to ground when pressed
• +: Power supply
• GND: Ground

Requires a compatible microcontroller, connecting wires and suitable code. Button actions and counting behaviour are controlled by your program. Configure a pull-up for SW and debounce the inputs as needed.

Package includes: 1 x KY-040 rotary encoder module. Microcontroller and connecting wires are supplied separately.

Arduino wiring and example-code guide