KY-040 Rotary Encoder

KY-040 Encoder Module with Threaded Shaft is an incremental rotary sensor with an integrated push button designed for use in robotics, measuring equipment, ARDUINO projects, and microcontroller systems where high precision, ease of control, and reliability are essential.

Unlike standard potentiometers, this encoder has no rotation limit (360°) and outputs a digital signal, providing faster response, precise positioning, and no resistive track wear. This is especially important for menu navigation, parameter adjustment, and fine-tuning device settings.

The encoder is equipped with a threaded metal shaft, which increases durability and allows easy panel mounting using a nut. High-quality mechanical contacts ensure stable and clear operation with tactile click feedback.

It operates within a 3.3–5 V supply range and provides 20 pulses per revolution, making it a versatile solution for most educational and professional electronics platforms.

Thanks to its compact size and on-board pull-up resistors, the module easily integrates into various projects without requiring extra external components.

Key Specifications:

• Model: KY-040 (Threaded)

• Type: Incremental Rotary Encoder with Switch

• Weight: ≈ 7 g

• Dimensions: ≈ 26 × 19 × 29 mm

• Operating Voltage: 3.3 – 5 V

• Pulses per Revolution: 20

• Rotation Angle: 360° (Continuous)

• Built-in Switch: Yes (Push-on shaft)

• Shaft Type: Threaded D-shaft

• Shaft Diameter: 6 mm

• Interface: Digital (CLK, DT, SW)

• Pull-up Resistors: On-board