360 Degree Rotary Encoder Brick Sensor Module KY-040 – Incremental Rotary Encoder with Push Button

The 360 Degree Rotary Encoder Brick Sensor Module KY-040 is an incremental electro-mechanical rotary input module designed to convert shaft rotation into digital pulse signals. By monitoring the two encoder output signals, a microcontroller can determine the direction of rotation and count rotary movement.

The module is useful wherever a physical knob or rotary control is required. It can be used for adjusting digital parameters, navigating menus, controlling motor-related settings, selecting values, or creating custom user interfaces.

The KY-040 provides 20 CPR and supports continuous 360-degree rotation. It also features a built-in push button, providing an additional input that can be used for selection, confirmation, reset, or other programmed functions.

Features

• KY-040 incremental rotary encoder module
• 360° continuous rotary operation
• 20 cycles per revolution (CPR)
• Digital pulse output for rotation detection
• Rotation direction can be determined by the controller
• Built-in center push-button switch
• Compact PCB + brass construction
• 5V DC operating voltage
• 2.75mm PCB mounting holes
• 13.75mm mounting-hole pitch
• Lightweight approximately 10g design
• Suitable for Arduino and other microcontroller projects

Applications

• Arduino rotary control projects
• Menu and parameter navigation
• Digital volume control
• Motor-control interfaces
• Stepper and servo motor projects
• Robotics projects
• Digital potentiometer-style interfaces
• User-interface control panels
• DIY electronics and embedded systems
• Educational electronics projects

How to Use

The KY-040 module commonly provides +V, GND, CLK, DT, and SW connections. CLK and DT are the two rotary encoder signals used to determine rotation movement and direction, while SW is connected to the center push button.

1. Connect GND to the microcontroller ground.
2. Connect +V to the appropriate supply voltage.
3. Connect CLK and DT to two digital input pins.
4. Connect SW to another digital input if the push-button function is required.
5. Use software to monitor the CLK/DT pulse sequence and determine clockwise or counterclockwise movement.
6. Count the detected transitions or pulses to track rotary movement.

Important Notes

• This is an incremental encoder, not an absolute-position encoder; the controller must track movement to determine the current position.
• The specified operating voltage is 5V DC. Check the logic-level requirements of your particular microcontroller before connecting the signal pins.
• The 6.6mm fitting nut and washer are not included.
• Product images are illustrative and the component brand or appearance may vary with stock.
• Allow approximately 5% measurement deviation because of manual measurement.
• Avoid excessive mechanical force on the encoder shaft or knob.
• The encoder is not intended to directly drive motors or other high-current loads; use a suitable motor driver or control circuit.

Package Includes

• 1 × 360 Degree Rotary Encoder Brick Sensor Module KY-040