| Sensor | Thermal Drift | Max Range | Typical Cost | | :--- | :--- | :--- | :--- | | | High (poor) | 30 cm | $2 | | FC 51 with modulation | Medium | 40 cm | $3 | | SHARP GP2Y0A21 (analog) | Low (compensated) | 80 cm | $12 | | VL53L0X (ToF laser) | Very low | 200 cm | $8 | | HC-SR04 (ultrasonic) | Negligible | 400 cm | $4 |
Digital TTL level (LOW when an obstacle is detected, HIGH when clear). Troubleshooting an Overheating FC-51 fc 51 ir sensor datasheet hot
FC-51 IR Obstacle Avoidance Sensor is a digital infrared proximity module used primarily in robotics for object detection. It uses an LM393 voltage comparator | Sensor | Thermal Drift | Max Range
A proximity sensor should not generate noticeable heat under normal 3.3V–5V operation. If it is hot to the touch, check the following: Arduino Forum If it is hot to the touch, check
The FC-51 is a widely used infrared (IR) obstacle/line-detection module that integrates an IR emitter and receiver with signal conditioning and often a potentiometer for sensitivity adjustment. It’s popular in hobbyist robotics, line-followers, proximity detection, and simple object-sensing applications.