Adjustable from 2cm to 30cm (some variants reach up to 80cm). Detection Angle: Approximately 35°.
The FC-51 has a standard 3-pin male header (0.1" spacing). Beware: The pin order differs between some clones; always check your board's silkscreen. Fc 51 Ir Sensor Datasheet
Unlike analog IR sensors (such as the TCRT5000-based modules), the FC-51 includes an onboard comparator circuit (typically an LM393 chip) that converts the analog signal from the phototransistor into a clean digital output. This makes it extremely easy to interface with microcontrollers like Arduino, Raspberry Pi, ESP32, or STM32. Adjustable from 2cm to 30cm (some variants reach up to 80cm)
The FC-51 uses logic. This is crucial for programming. Beware: The pin order differs between some clones;
If the reflected intensity is high enough, the OUT pin goes LOW and the onboard "Status LED" lights up. Infrared Sensors Specs, Operation, Types and Applications
| Feature | FC-51 | TCRT5000 (Module) | Sharp GP2Y0A21 | | :--- | :--- | :--- | :--- | | | Digital (fixed threshold) | Analog (variable) | Analog (variable) | | Detection Range | 2-30 cm | 1-15 cm | 10-80 cm | | Distance Measurement | No (only threshold) | Possible with ADC | Yes (linearized) | | Ambient Light Reject | Moderate | Low | High (modulated) | | Cost | Very Low ($1-2) | Low ($2-3) | High ($10-15) | | Best For | Obstacle detection, line following | Short-range proximity | Distance sensing applications |
The is a popular obstacle avoidance module commonly used in robotics to detect objects at close range. Key Specifications Operating Voltage: 3.3V to 5V DC.