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This $30 ESP32-powered display is a clock today, but (almost) anything else I can think of tomorrow

Elecrow's Rotary Displays are a great addition to your smart home, but the 1.28-inch model is the one I spent the most time ...
IEEE

Rotary Encoder Based Self-Positioning Method for Mobile Robot

Abstract: In this paper, we present a mobile robot self-positioning method based on a rotary encoder. Firstly, we analyze the wheel speed information about the robot by using the rotary encoder.