KY-040 Rotary Encoder Module 360° Push Button 20 Pulse 5V

KY-040 360° Rotary Encoder Module with Push Button — 20 Pulse, 5V

The KY-040 Rotary Encoder Module is a compact, versatile input component ideal for DIY electronics projects, Arduino builds, and maker workbenches. Featuring full 360-degree rotation with 20 pulses per revolution and a built-in push button, this module gives you precise incremental control in a small, easy-to-wire package.

Key Features

• 360° Continuous Rotation: Smooth, full-rotation encoding with no end-stop — ideal for menus, volume controls, and position tracking.
• 20 Pulses Per Revolution: Provides reliable incremental steps for accurate input detection.
• Integrated Push Button: Press the shaft to reset the count to zero or trigger a secondary action — no extra component needed.
• 5V Compatible: Works directly with Arduino, Raspberry Pi, and other 5V microcontroller platforms.
• Compact Form Factor: Measures approximately 31 × 19 × 29 mm (1.22" × 0.75" × 1.14") — fits easily on a breadboard or inside an enclosure.
• PCB-Mounted: Built on a quality PCB with standard through-hole pin headers for simple plug-in wiring.
• 3 Color Options: Choose the finish that suits your project aesthetic.

Specifications

Perfect For

• Arduino & Raspberry Pi projects
• DIY audio volume controls
• Menu navigation in embedded systems
• Motor speed or position tuning
• CNC and robotics builds
• Maker and electronics hobbyist prototyping

For guidance on safe handling of electronic components and DIY electronics projects, visit the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: What does the KY-040 rotary encoder module do?

A: The KY-040 rotary encoder module converts rotational movement into digital pulses, outputting 20 incremental signals per full 360° turn. It also features a built-in push button that, when pressed, can reset the count back to zero or trigger a secondary function in your code — making it ideal for navigation, tuning, and control interfaces in DIY electronics projects.

Q: Is the KY-040 module compatible with Arduino and Raspberry Pi?

A: Yes. The KY-040 operates at 5V DC, making it directly compatible with Arduino boards, Raspberry Pi (with appropriate resistors or logic-level handling), and most other common 5V microcontroller development platforms. It uses a standard 5-pin interface (GND, +, SW, DT, CLK) that connects easily via breadboard or jumper wires.

Q: What is the KY-040 module made of and how big is it?

A: The module is constructed from quality electronic components mounted on a PCB (printed circuit board). It measures approximately 31 × 19 × 29 mm (1.22" × 0.75" × 1.14"), making it a very compact addition to any electronics project or enclosure.

Q: How many pulses per revolution does the KY-040 encoder produce?

A: The KY-040 produces 20 pulses per full revolution, meaning each detent or step represents 1/20th of a complete rotation. This gives you consistent, repeatable incremental input — perfect for menu selection, value adjustment, or position sensing.