Fc 51 Ir Sensor Datasheet -

[FC-51 Module] [Obstacle] +------------------+ | IR Transmitter | ------ (IR Light) ------> | | (Clear LED) | | | | | | IR Receiver | <--- (Reflected Light) -- | | (Black PD) | +------------------+

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The is a popular, cost-effective module used widely in robotics for obstacle avoidance and proximity detection. Using a simple infrared "reflection" principle, it identifies objects by bouncing IR light off surfaces and measuring the return signal. FC-51 Key Technical Specifications Specification Operating Voltage 3.0V – 6.0V DC Detection Range 2cm – 30cm (Adjustable via onboard potentiometer) Detection Angle Current Consumption ~23 mA at 3.3V; ~43 mA at 5.0V Output Type Digital signal (0 or 1) Onboard IC LM393 Dual Comparator Pinout Configuration

The FC-51 is a low-cost, highly efficient infrared (IR) obstacle avoidance sensor module widely used in robotics, automation, and DIY electronics. This module utilizes infrared reflection to detect objects within a specific range, making it an ideal choice for wheeled robots, security systems, and manufacturing line counters. Module Overview and Working Principle

The FC-51's 3.3V compatibility makes it a great choice for the Raspberry Pi ecosystem. Fc 51 Ir Sensor Datasheet

The FC-51 is a highly popular, low-cost infrared (IR) obstacle avoidance sensor widely used in robotics, automation, and Arduino projects. It provides a simple digital output whenever an object enters its detection range.

Illuminates when an obstacle is detected within the set threshold.

If the light hits a light-colored or reflective object, a significant portion reflects backward. If it hits a matte black or dark object, the material absorbs the IR light, drastically reducing the effective detection range.

Direct sunlight or heavy incandescent lighting contains large amounts of infrared radiation. This can flood the photodiode and cause false triggers. For outdoor use, shield the sensor housing from direct sunlight. Common Applications The FC-51 is a highly popular, low-cost infrared

The FC-51 is an excellent building block for many creative projects:

Lights up immediately when power is supplied to the VCC and GND pins.

This simple sketch prints "OBSTACLE!!" to the serial monitor when an object is detected.

The transmitter IR LED constantly emits an invisible beam of infrared light. Simply change the condition to:

Illuminates only when an obstacle is detected within the set threshold range.

Digital signal (TTL level). It outputs a Low logic level when an obstacle is detected and a High level when the path is clear.

Lights up immediately when the module receives power.

Simply change the condition to: