Fc 51 Ir Sensor Datasheet Hot Updated -
The FC-51 is a low-cost infrared (IR) obstacle avoidance sensor module commonly used in robotics for proximity detection. It operates by emitting an IR signal and measuring the reflection from nearby objects. Technical Specifications
The module typically utilizes an LM393 voltage comparator for stable detection. Operating Voltage: 3.0V to 6.0V DC (Standard 3.3V or 5V). Current Consumption: ~23mA at 3.3V; ~43mA at 5.0V.
Detection Range: 2cm to 30cm (Adjustable via onboard potentiometer). Detection Angle: Approximately 35°.
Output Signal: Digital signal (LOW when an obstacle is detected, HIGH otherwise). Dimensions: ~3.1cm x 1.4cm (PCB size). Pin Configuration
The module features a 3-pin header for easy connection to microcontrollers like Arduino or Raspberry Pi. VCC: Power input (3V – 5V). GND: Ground. OUT: Digital output interface. Key Features & Components
IR Emitter & Receiver: A pair of infrared tubes (one for transmitting, one for receiving). Onboard LEDs: Power LED: Lights up when the module is powered. fc 51 ir sensor datasheet hot
Obstacle LED: Lights up when an object is within the set detection range.
Adjustable Sensitivity: A built-in potentiometer allows users to fine-tune the sensing distance. Turning it clockwise typically increases the range, while counter-clockwise decreases it. Performance Considerations
Ambient Light: While stable, direct sunlight or high-intensity ambient light can interfere with IR reception.
Surface Reflectivity: The sensor is highly dependent on the object's color and texture. Dark or matte black surfaces reflect less IR light and may be harder to detect than white or reflective ones.
Calibration: For best results, the Model Railroad Signal Systems documentation recommends adjusting the potentiometer until the detection LED just turns off when no object is present. The FC-51 is a low-cost infrared (IR) obstacle
If you are planning to use this for a project, would you like a sample Arduino code snippet or a circuit wiring diagram to get started?
FC-51 IR Obstacle Avoidance Sensor is a popular, low-cost module often found in Arduino kits for robotics and object detection. While it's generally reliable, a "hot" sensor usually indicates a wiring error or a hardware short. Quick Fix: Why is my FC-51 Hot? If your sensor is getting physically hot to the touch, unplug it immediately . The most common causes are: Reverse Polarity
: The most frequent cause of overheating is connecting VCC and GND in reverse. Power Overload : Using a power source higher than the rated 3.0V – 6.0V can cook the onboard LM393 Comparator IC Faulty IR Receiver
: A short circuit inside the IR receiver component itself can cause it to burn. FC-51 Technical Specifications
Functional behavior
- The emitter forwards IR light. When the emitted IR reflects off a nearby object and returns to the receiver, the receiver’s signal increases.
- The comparator compares receiver signal to the threshold set by the potentiometer. When the signal exceeds (or falls below, depending on wiring) the threshold, the digital output toggles.
- Ambient light and IR sources (sunlight, incandescent) can cause false triggers; modules are often tuned to be less sensitive to ambient IR but still require calibration.
Key Specifications (Typical)
| Parameter | Value | | :--- | :--- | | Operating Voltage | 3.3V to 5V DC | | Current Consumption | 20mA to 40mA (LED + comparator) | | Detection Distance | 2cm to 30cm (adjustable) | | Sensing Angle | 35 degrees | | Output Type | Digital (TTL) – Active Low (0V when obstacle detected) | | Comparator IC | LM393 or LM358 | | Indicator LEDs | Power (Red), Output (Green) | | PCB Dimensions | 32mm x 14mm | The emitter forwards IR light
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Body: Working on an obstacle avoidance robot or a line follower? The FC-51 Infrared Obstacle Avoidance Sensor is a staple for Arduino and ESP32 projects. If you are looking for the specs, pinouts, and technical details to get your build moving, check out the datasheet below.
📂 Download the FC-51 Datasheet here: [Insert Link]
Key Specs: ✔️ Operating Voltage: 3.3V - 5V ✔️ Detection Range: 2cm ~ 30cm (Adjustable) ✔️ Interface: Digital Output (High/Low) ✔️ Built-in LED Indicator
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Onboard Voltage Regulator (often AMS1117 or similar)
- Input: up to 15V
- Output: 5V or 3.3V
- Dropout voltage + current = heat.
4.1. Reduce Operating Voltage
Run the sensor at 3.3V instead of 5V. This cuts current by ~30%, reducing self-heating. Check your logic level converter if using a 5V Arduino.
Quick Spec Sheet (The Essentials)
- Operating Voltage: 3.3V – 5V DC (perfect for USB power)
- Detection Range: 2 cm to 30 cm (adjustable via potentiometer)
- Output: Digital (0 or 1) – high when no object detected, low when an object is present.
- Principle: Active infrared (emits IR light, measures reflection).