Generic EC11 Rotary Encoder Module with Knob Cap - 5-Pin Header

The module is designed for a typical operating voltage of 5V DC, which is standard for Arduino and many development boards. The digital output pins are generally compatible with 3.3V logic systems, but the VCC supply should be maintained within the 3V to 5V range for reliable switch and encoder operation. Always verify the logic level compatibility with your specific microcontroller.

Connect the module's 5-pin header to your Arduino as follows: VCC to 5V, GND to GND, SW (switch) to a digital input pin, and CLK (clock) and DT (data) to two additional digital input pins. Use internal pull-up resistors on the SW, CLK, and DT pins. You can then use a rotary encoder library to read rotation direction, count steps, and detect button presses for your application.

The EC11 is an incremental rotary encoder. It outputs a quadrature signal (two square waves 90 degrees out of phase) on the CLK and DT pins as the shaft rotates. Your microcontroller must count these pulses to track relative position changes; it does not provide an absolute position reading on power-up. The push-button provides a separate digital signal for a momentary switch function.

Yes, the module can typically be used with 3.3V systems. You should power the module's VCC pin with 3.3V instead of 5V. The digital output signals from the encoder and switch will then be at 3.3V logic levels, making them safe for direct connection to 3.3V microcontroller GPIO pins. Always test compatibility in your specific circuit.