KY-040 Rotary Encoder

The KY-040 Rotary Encoder Module is a compact and reliable input device used to provide rotary control in electronic projects. Unlike a potentiometer, this encoder offers infinite rotation (360 degrees) without stop points, allowing for continuous input. It operates on a voltage range of 3.3V to 5V, making it compatible with most microcontroller platforms including Arduino, ESP32, and Raspberry Pi. The module outputs a 2-bit gray code signal, which allows the microcontroller to determine both the direction of rotation and the number of steps moved. Key features include a durable brass shaft, a push-button switch integrated into the knob, and a standard 0.1-inch header for easy breadboard connectivity. With a mechanical rotation life of up to 30,000 cycles, it is built for longevity. Common applications include menu navigation in LCD displays, volume control in audio projects, motor speed control, and as an interface for robotics and CNC machines. Choose the KY-040 for a cost-effective, high-quality solution to add precise rotary input to your DIY electronics projects.