There is no single “official” FC-51 datasheet from one manufacturer (it’s a generic design). However, the key components have public datasheets:
void setup() pinMode(sensorPin, INPUT); pinMode(ledPin, OUTPUT); Serial.begin(9600);
Digital Logic (LOW when an obstacle is detected, HIGH when clear) Power LED (Red) & Obstacle Detection LED (Green/Red) PCB Dimensions 3.1 cm × 1.4 cm (Overall length including LEDs: 4.5 cm) Hardware Architecture and Pinout fc 51 ir sensor datasheet hot
Digital TTL level (LOW when an obstacle is detected, HIGH when clear). Troubleshooting an Overheating FC-51
SENSOR_PIN = 21 GPIO.setmode(GPIO.BCM) GPIO.setup(SENSOR_PIN, GPIO.IN) There is no single “official” FC-51 datasheet from
In essence, choose the for general object detection at short distances, and the TCRT5000 for precise line-following or color detection applications.
If you are stuck with the FC 51 but need stable performance, apply these fixes. If you are stuck with the FC 51
Look at your code. Ensure that the pin connected to the FC-51's OUT pin is explicitly defined as an input. In Arduino IDE, it should look like this:
void setup() pinMode(SENSOR_POWER, OUTPUT); pinMode(SENSOR_OUT, INPUT);
If you are an electronics enthusiast or an embedded systems engineer, you have likely encountered the FC 51 infrared obstacle avoidance sensor. It is cheap, reliable, and ubiquitous in Arduino and Raspberry Pi projects—from line-following robots to proximity alarms.
The FC‑51 can be paired with an ESP8266 or ESP32 to send detection events to a cloud platform like Blynk, enabling remote alerts for door openings or package deliveries.