SPECIFICATIONS

🚀 Precise Digital Control at Your Fingertips!

Upgrade from simple potentiometers to high-precision digital rotary encoders! The KY-040 module combines 360° infinite rotation with a push-button function, delivering 20 pulses per revolution. It’s the perfect choice for menu navigation, parameter adjustment, and motor control in Arduino, Raspberry Pi, and other microcontroller projects

✨ Key Features & Benefits

Infinite Rotation & Extended Lifespan: No physical stops allow continuous 360° rotation, eliminating mechanical wear and ensuring a much longer life than standard potentiometers.

High Precision & Bidirectional Detection: 20 clear pulses per revolution enable accurate detection of both rotation amount and direction (clockwise/counterclockwise) for fine-grained control.

Integrated Push-Button Function: The shaft can be pressed as a digital switch, combining rotation and click actions in one component to simplify UI design for selection confirmation or reset.

Plug-and-Play Integration: The module includes built-in pull-up resistors and debounce capacitors for clean digital signals. Simply connect the CLK, DT, and SW pins to your microcontroller’s digital pins for quick setup.

📝 Product Description

The KY-040 Rotary Encoder Module elevates your projects from analog to precise digital control. Ideal for volume adjustment, menu selection, motor positioning, parameter setting, and various interactive applications, it’s a must-have for makers, electronics enthusiasts, and educational experiments.

⚠️ Important Notes / How to Use (Key to Preventing Negative Reviews!)

Voltage Compatibility Warning: This module is designed for 5V operation. Do NOT connect directly to 3.3V systems (e.g., ESP32, ESP8266) to avoid damaging GPIO pins! Use a logic level converter if interfacing with 3.3V devices.

Signal Decoding Required: Outputs quadrature encoder signals (CLK/DT). You must use a library or custom code to decode direction and pulse count—it does NOT output an analog value or absolute position directly.

Software Debouncing Essential: Although basic hardware debouncing is included, mechanical encoders inherently have contact bounce. Implement a software debounce algorithm in your code for reliable readings.

No Memory Function: This is an incremental encoder. It does NOT retain position after power loss. You must implement pulse counting and storage in your code if position memory is needed.

📋 Specifications

Model: KY-040

Operating Voltage: 5V DC

Resolution: 20 Pulses Per Revolution (20 PPR)

Rotation: 360°, Infinite

Built-in Switch: Push Button (press the shaft)

Output Signals: CLK (Clock), DT (Data), SW (Switch)

Interface: 5-pin (GND, +, SW, DT, CLK)

Module Size: 31×19×29mm

📦 Package Includes

1 × KY-040 Rotary Encoder Module
1 × Knob Cap