SHARP LC-20D68UT Ir Sensor Board LC-40D68UT 004825522

( Brand: Sharp ), ( Manufacturer Part Number: LC-20D68UT ), ( Compatible Brand: For Sharp ), ( Type: Sensor Board )

Review SHARP Ir Sensor Board

The **Sharp GP2Y0A21YK0F (LC-20D68UT and LC-40D68UT)** infrared (IR) sensor modules, identified by the part number **004825522**, are high-performance, compact, and versatile optical sensors designed for precise distance measurement and object detection in a wide range of applications. These modules utilize Sharp s advanced **GP2Y0A21YK0F** sensor chip, a member of the **GP2Y0A21** series, which combines **infrared (IR) emission and reception** with **analog output** for real-time distance sensing. The **LC-20D68UT** and **LC-40D68UT** variants differ primarily in their **operating ranges**, with the **LC-20D68UT** covering a shorter distance span (typically **20 cm to 150 cm**) and the **LC-40D68UT** extending its reach to **40 cm to 300 cm**, making them suitable for diverse environments from close-proximity obstacle avoidance to broader area monitoring.

These sensor boards feature a **highly integrated design**, incorporating an **IR LED emitter** and a **photodiode receiver** on a single module, along with a **signal conditioning circuit** that converts the reflected IR signal into a **proportional analog voltage output** (typically **0.4V to 2.6V**) via a **VCC pin**, while the **AOUT pin** provides the measurable analog signal. The modules are optimized for **low-power operation**, making them ideal for battery-powered devices or systems where energy efficiency is critical. Each board includes **standard through-hole mounting holes** for easy integration into prototypes, PCBs, or custom setups, and the **compact footprint** (approximately **20mm x 20mm**) ensures minimal space consumption without compromising functionality.

The **GP2Y0A21YK0F** sensor employs **pulse-width modulation (PWM) modulation** of the IR LED, which enhances accuracy and reduces noise in the received signal, resulting in **high repeatability and low drift** over time. The analog output is **linearly proportional** to the detected distance, allowing for straightforward interfacing with microcontrollers like Arduino, Raspberry Pi, or STM32 via an **ADC (Analog-to-Digital Converter)**. The modules are **self-contained**, requiring only a **5V power supply** (though some variants may operate at 3.3V with minor adjustments) and a **ground connection**, simplifying wiring and reducing component count in designs. Additionally, the **wide angular field of view** (approximately **30 degrees**) ensures reliable detection of objects within the specified range, even when the sensor is slightly misaligned.

Beyond their primary function as distance sensors, these modules are highly adaptable for applications such as **automatic door openers, robotics obstacle avoidance, parking sensors, liquid level detection, and industrial proximity monitoring**. Their **non-contact operation** eliminates wear and tear on mechanical switches, while their **fast response time** (typically **

### Pros and Cons of buying a Sharp LC-20D68UT/LC-40D68UT IR Sensor Board (Part No. 004825522)

1. **High Accuracy and Precision** The Sharp IR sensors (LC-20D68UT and LC-40D68UT) are known for their high-resolution distance measurement capabilities, making them ideal for applications requiring precise object detection and proximity sensing.

2. **Wide Detection Range**

- The **LC-20D68UT** offers a detection range of **20 cm to 80 cm**, suitable for short-range applications.

- The **LC-40D68UT** extends this range to **40 cm to 150 cm**, providing flexibility for medium-range sensing.

Both models are useful in robotics, automation, and industrial applications where varying distances are required.

3. **Fast Response Time** These sensors provide quick readings, making them suitable for dynamic environments where real-time detection is necessary.

4. **Compact and Modular Design** The sensor board is designed to be easily integrated into projects, with standard mounting options and compatibility with Arduino, Raspberry Pi, and other microcontroller platforms.

5. **Good Signal-to-Noise Ratio** Sharp s IR technology minimizes interference from ambient light, ensuring reliable performance in many environments.

6. **Affordable Alternative to Laser Sensors** Compared to laser-based distance sensors, these IR sensors are generally more cost-effective while still providing decent accuracy.

7. **Compatibility with Existing Systems** The sensor board (004825522) is designed to work with Sharp s existing IR sensor modules, making it easier to upgrade or replace older components.

8. **Low Power Consumption** Suitable for battery-powered applications due to their efficient operation.

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1. **Limited Long-Range Capability** While the LC-40D68UT extends to **150 cm**, it is not as effective as ultrasonic or laser sensors for very long-range applications (e.g., beyond 2 meters).

2. **Sensitivity to Ambient Light** Although better than many IR sensors, strong ambient light (e.g., direct sunlight) can still affect performance, requiring careful placement or shielding.

3. **Obstruction Issues** Like all IR sensors, these can be fooled by reflective surfaces or obstacles that block the IR beam, leading to false readings.

4. **Limited Angular Field of View** The detection area is relatively narrow compared to ultrasonic sensors, which may require additional sensors or mechanical adjustments for wider coverage.

5. **Potential for Signal Drift Over Time** Some IR sensors experience slight accuracy degradation over prolonged use, though this is generally minor with well-calibrated units.

6. **Requires Additional Electronics for Full Functionality** While the sensor board itself is functional, users may need to interface it with a microcontroller (e.g., Arduino) and additional circuitry (e.g., voltage regulators, signal conditioners) for optimal performance.

7. **Availability and Compatibility Concerns** Sharp s IR sensor ecosystem is not as widely supported as some other sensor brands (e.g., HC-SR04 ultrasonic sensors), which may limit community resources and troubleshooting options.

8. **No Built-in Analog Output (on Some Models)** Some variants may require digital signal processing, which could add complexity to certain applications.

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The **Sharp LC-20D68UT/LC-40D68UT IR Sensor Board (004825522)** is a solid choice for applications requiring **short-to-medium-range distance sensing with decent accuracy and reliability**. It excels in **indoor or controlled environments** where ambient light is minimal and where a **compact, cost-effective solution** is preferred over ultrasonic or laser alternatives.

However, if your project demands **long-range sensing, high robustness against ambient light, or wide-angle coverage**, you may need to consider **ultrasonic sensors (e.g., HC-SR04) or laser-based sensors (e.g., VL53L0X)**. Additionally, if you are working on a **highly complex system**, ensure you account for the need for supplementary electronics and potential calibration requirements.

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- You need a **precise, short-to-medium-range IR sensor** for applications like **robotics, automation, or proximity detection in controlled environments**.

- You are working within a **budget-friendly range** and do not require extreme long-range capabilities.

- You are already using Sharp sensors and want to **upgrade or replace an existing module**.

- Your project requires **long-distance sensing (beyond 150 cm)** or **high robustness against ambient light**.

- You need **wide-angle coverage** without additional sensors or mechanical adjustments.

- You prefer **easier-to-find alternatives** with more community support (e.g., ultrasonic sensors).

For most **beginner to intermediate DIY projects**, this sensor is a **good mid-range option**, but for **high-end or specialized applications**, evaluating alternatives may be worthwhile. Always test the sensor in your specific environment before finalizing a purchase.

Details:

Came out of broken screen TV.

part #: lc20d68ut prices

• $11.21-$19.95

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• compatible brand: For Sharp
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