Gravity: MiniQ Robot Chassis Encoder

Mini Robot Chassis Encoder is designed to provide reliable wheel rotation feedback for compact mobile robots, particularly the 2WD MiniQ robot chassis platform. Using dual infrared reflective sensors, this quadrature encoder generates AB two‑phase pulse signals with approximately 90° phase difference, allowing accurate detection of both rotation speed and direction. Such a wheel motion sensing module enables closed‑loop motor control, making precise navigation and movement tracking possible in small robotics systems. Compatibility with common development platforms such as Arduino controllers further simplifies integration into robotics experiments, motion control projects, and STEM learning setups.

Note: Infrared receiver sensitivity should be adjusted with an oscilloscope before operation. For 3.3V systems, short circuit resistor R4 to ensure proper signal performance.

Quadrature AB Phase Detection

A dual-channel quadrature output system generates two pulse signals with roughly 90° phase difference, enabling accurate interpretation of wheel direction and rotational speed. By analyzing the lead and lag relationship between the A and B channels, robotic controllers can determine forward or reverse motion with high reliability. Such signal design supports advanced control algorithms such as PID speed regulation and position tracking, forming the foundation for stable movement control in differential-drive robots and other mobile robotics platforms.

Infrared Reflective Sensing Mechanism

Wheel rotation measurement is achieved through two infrared reflective sensors that detect patterned movement from the rotating wheel assembly. This non-contact optical detection method provides consistent pulse generation with minimal mechanical wear. Adjustable receiver sensitivity allows fine tuning based on installation environment and surface reflectivity, ensuring stable signal output across different lighting conditions and mechanical tolerances commonly encountered in educational robotics builds and experimental mobile platforms.

Designed for MiniQ Robot Chassis Integration

This compact robotic wheel encoder is specifically matched to the 2WD MiniQ robot chassis and compatible motor brackets. A standard sensor cable interface simplifies installation and wiring compared with earlier connector designs. The improved interface layout allows straightforward connection to controller boards and expansion shields, making the module suitable for rapid prototyping, robotics coursework, and motion control experimentation where quick assembly and reliable signal output are essential.

Such a compact wheel feedback sensor supports applications including differential-drive robot development, motion tracking experiments, educational robotics platforms, and PID-based motor control studies. Integration into miniature mobile robots enables accurate odometry estimation and closed-loop navigation, supporting robotics learning environments, prototyping labs, and STEM Education projects that require practical demonstrations of encoder-based motion sensing.