51 Ir Sensor Datasheet | Fc

: The transmitter continuously sends out IR waves at a specific frequency.

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. Fc 51 Ir Sensor Datasheet

(Optional: Connect an LED via a 220Ω resistor to Pin 13 for onboard LED indication.) : The transmitter continuously sends out IR waves

| Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | | Digital output signal (HIGH = no object, LOW = object detected) | | 2 | VCC | Power supply input (3.3V or 5V) | | 3 | GND | Ground (0V) | (Optional: Connect an LED via a 220Ω resistor

Even a simple sensor like the FC-51 can exhibit issues. Here’s a troubleshooting guide: