EC11 rotary encoder, 3-pin or 5-pin /EC11 digital potentiometer

EC11 Rotary Encoder – Digital Control, 3-Pin and 5-Pin Versions

The EC11 is an incremental rotary encoder designed for adjusting settings and navigating menus in electronic projects. Its continuous rotation lets you increase or decrease a value, while the built-in push-button on the 5-pin version allows you to confirm a selection or trigger a command. It provides a practical control interface for microcontroller-based projects.

Often marketed as a “digital potentiometer,” the EC11 does not directly vary resistance. Instead, it generates pulses that allow your program to determine the direction of rotation and the relative movement of the shaft. Volume, brightness, and other settings are then controlled by your circuit and software.

Technical Specifications

These specifications describe common EC11 variants. Pulse count, detents, shaft length, and electrical ratings may vary depending on the manufacturer and exact model.

Wiring note: on the bare 5-pin component, the terminals correspond to A, B, common, and the two push-button contacts. Do not confuse these connections with the pin labels found on a rotary encoder module mounted on a circuit board.

Applications

• Control interfaces: menu navigation, option selection, and confirmation.

• Audio equipment: digital volume control and function selection.

• Electronic lighting: brightness setpoint adjustment.

• Instrumentation and automation: adjustment of thresholds, timers, and control setpoints.

• Prototyping and training: learning pulse counting and rotation direction detection with a microcontroller.

Project Examples

1. LCD or OLED menu controller: rotate the shaft to browse options and press the button to confirm on the 5-pin version.

2. Microcontroller-based LED dimmer: use rotation to adjust a brightness setting that controls an LED driver circuit.

3. Digital volume controller: turn the encoder to increase or decrease volume and assign a mute function to the push-button.

4. Adjustable timer: select a duration using the encoder and start the countdown with the button.

5. Relative rotation counter: display increments and decrements generated by rotation to demonstrate how an encoder works.

These projects use the encoder’s rotation pulses and, where available, its push-button contacts. They require suitable software and additional components.