The is a low-cost infrared (IR) obstacle avoidance sensor module commonly used in robotics for short-range detection. It functions by emitting an IR signal from a transmitter LED; if an object is within range, the IR light reflects back and is detected by a receiver phototransistor, triggering a digital signal . Core Technical Specifications Specification Operating Voltage 3.0V – 6.0V DC Detection Range 2cm – 30cm (Adjustable via onboard potentiometer) Detection Angle Approximately 35° Current Consumption ~23 mA at 3.3V / ~43 mA at 5.0V Output Type
pinMode(2, INPUT); pinMode(13, OUTPUT); if (digitalRead(2) == LOW) digitalWrite(13, HIGH); else digitalWrite(13, LOW); Fc 51 Ir Sensor Datasheet
Digital signal (LOW when obstacle detected, HIGH when clear) PCB: 3.1 cm x 1.4 cm; Overall: 4.5 cm x 1.4 cm x 0.7 cm Interface and Components Pinout: VCC: Power input (3.3V - 5V). GND: Ground connection. OUT: Digital output pin. Onboard Indicators: Power LED: Remains lit while the module is powered. The is a low-cost infrared (IR) obstacle avoidance
Keep in mind that the datasheet may vary depending on the manufacturer or the specific version of the sensor. GND: Ground connection
Digital output pin to be connected to an Arduino digital I/O . Working Principle Emission: The IR LED constantly emits infrared light.