1.3" OLED + EC11 DIY Control Board

A purpose-built control interface board featuring a 1.3-inch OLED display (I²C), EC11 rotary encoder, and two dedicated navigation buttons (return and confirm), all integrated onto one PCB. Dimensions: ~33 mm × 33 mm × 5 mm; weight: ~5 g. Operates at 3.3–5 V DC with standard I²C communication (address 0x3C). Constructed solely from FR-4 PCB material — no plastics, overlays, or adhesives. The OLED provides high legibility under varied lighting, with fast pixel response and minimal ghosting. The EC11 encoder delivers tactile feedback with clear rotational steps and a durable metal shaft. Both encoder and buttons use through-hole or reinforced SMD mounting for mechanical robustness. All interfaces follow conventional pin assignments — VCC, GND, SDA, SCL, and individual button/encoder signal lines — facilitating rapid testing and firmware adaptation. Ideal for engineers and educators developing interactive edge devices: data loggers with adjustable sampling rates, motor controllers with parameter tuning, or STEM kits teaching human-interface design. The module’s fixed geometry and known electrical characteristics remove variability in early-stage prototyping — letting users focus on logic and UX rather than hardware integration surprises.