JSUMO QTR1A Contrast (Edge) Sensor

The SUMO QTR1A Contrast (Edge) Sensor is a high-performance reflective optical sensor specifically designed for edge detection and surface contrast recognition in robotic applications. It is widely used in mini sumo and standard sumo robots to detect the boundary line of the competition ring and prevent the robot from leaving the arena. The sensor is based on the proven QRE1113GR SMD reflective optocoupler , which combines an infrared emitter and phototransistor in a compact package. By measuring the amount of reflected infrared light, the sensor can distinguish between dark and light surfaces with excellent accuracy. When mounted underneath a robot, the sensor can reliably detect the transition between the black fighting area and the white boundary line of a sumo ring. This enables rapid corrective actions, helping the robot remain inside the arena while maintaining aggressive competition strategies. Its compact size, lightweight design, and reliable operation make it suitable for educational robotics, autonomous navigation systems, line-following robots, and competitive sumo robot projects. Specifications Parameter Value Product Name SUMO QTR1A Contrast (Edge) Sensor Sensor Type Reflective Optical Sensor Sensing Method Infrared Reflection Sensor Element QRE1113GR SMD Optocoupler Detection Type Surface Contrast Detection Surface Recognition Black and White Surfaces Output Type Analog Reflectance Output Mounting Position Bottom of Robot Chassis Application Edge and Line Detection Operating Principle The sensor emits infrared light toward the surface beneath it. Light-colored surfaces reflect more infrared light back to the receiver, while dark surfaces absorb more light and reflect less. By measuring the reflected light intensity, the sensor can determine whether it is positioned over a black or white surface, allowing the robot to detect ring boundaries and respond accordingly. Advantages for Sumo Robots Improves ring boundary awareness. Enhances autonomous navigation accuracy. Provides fast edge detection during high-speed movement. Supports safer and more effective competition strategies. Helps maintain robot position inside the dohyo ring Applications Mini sumo robot edge detection. Standard sumo robot boundary sensing. Dohyo ring edge detection. Line-following robots. Autonomous navigation systems. Educational robotics projects. Obstacle and surface detection systems. Research and robotics competitions. Position correction and boundary monitoring. Smart mobile robot platforms.