| Parameter | Value / Range | |----------------------------|-----------------------------------------| | | 3.3V to 5V DC | | Supply Current | 20 mA to 40 mA (typical 25 mA) | | Output Type | Digital (TTL, active low) & Analog* | | Output Logic | 0V (object detected), 5V (no object) | | Detection Range | 2 cm to 30 cm (adjustable via potentiometer) | | Optimal Detection Distance | 10 cm to 20 cm | | IR Wavelength | 950 nm (typical) | | Response Time | < 20 µs | | Operating Temperature | -10°C to +70°C | | Board Dimensions | 32 mm x 14 mm x 8 mm (L x W x H) | | Mounting Hole Diameter | 3 mm |
In the world of embedded systems and robotics, obstacle detection is a fundamental requirement. From line-following robots to smart waste bins, the ability to sense proximity without physical contact is crucial. Among the most popular, cost-effective, and versatile solutions for this task is the FC-51 Infrared Obstacle Avoidance Sensor. Fc 51 Ir Sensor Datasheet
: Lights up when an object is within the set detection range. Limitations & Best Practices distance with ir sensor fc-51 - Arduino Forum : Lights up when an object is within the set detection range
To set the optimal threshold, place a white object at your desired detection distance (e.g., 15 cm). Turn the potentiometer slowly until the onboard LED just turns ON (or the output goes LOW). Then move the object 1-2 cm farther; the LED should turn OFF. This ensures reliable detection without oversensitivity. Then move the object 1-2 cm farther; the LED should turn OFF
This guide was compiled from manufacturer datasheets, reverse engineering, and community testing. For critical applications, always verify with your module’s actual behavior using an oscilloscope or logic analyzer.
While many low-cost datasheets omit precise timing, standard IR reflective sensors exhibit the following characteristics: