The Elecrow Crowtail Rotary Angle Sensor 2.0 (Model CT0053RAS) is a simple yet useful analog input module for projects needing control based on rotation. It’s essentially a potentiometer that provides a variable analog output based on the angular position of its knob. With an angular range of about 300°, its resistance changes linearly as you turn the shaft, making it ideal for things like volume knobs, servo calibration, or any kind of user‑controlled input where smooth rotation matters. This sensor operates at around 5 volts DC (specifically works with 4.75V to 5.25V), compatible with standard microcontrollers like Arduino connected via Crowtail base shield. The resistance when the knob is at one end is about 10 kΩ, rising or falling linearly as the knob turns. It comes in a compact form factor (~21.3 × 20.0 × 21.6 mm) and has a Crowtail interface so wiring is easy. Because its output is analog, you read the voltage on an analog input pin and convert that to a usable number – often mapping turn angle to a percentage or a value in code. Overall, the Crowtail Rotary Angle Sensor 2.0 is low‑cost, easy to use, and works well for projects where you want to adjust something via turning – from adjusting light intensity to steering robots, or as a control knob on custom hardware.