KY-040 Rotary Encoder Module

The KY-040 Rotary Encoder Module is an input device that measures rotational movement and direction with unlimited 360-degree rotation. It generates 20 pulses per revolution (PPR) and includes an integrated push-button switch.Key Features

• Direction Detection: Uses two outputs (CLK and DT) to track rotation direction by sensing which pin changes state first.
• Integrated Button: Pressing the knob down triggers a built-in switch (SW pin) by closing the connection to ground.
• Operating Voltage: Works on both 3.3V and 5V systems.

Pinout Configuration

• GND: Connects to system ground.
• VCC: Connects to 3.3V or 5V power.
• SW: Digital output for the push-button switch.
• DT: Digital output for direction data.
• CLK: Digital output for step clocking