The **ME26XBG-R** is an **Ultraviolet (UV) Sensor Module** specifically designed to detect UV light intensity (typically in the UV-A and UV-B spectrum). These sensors are commonly used in environmental monitoring, wearable tech, and industrial exposure safety. --- ### 1. Key Component Specifications The module typically centers around a Gallium Nitride (GaN) or Silicon Carbide (SiC) based photodiode. | Parameter | Specification (Typical) | | :--- | :--- | | **Detection Spectrum** | 240nm – 370nm (UV-A / UV-B) | | **Operating Voltage** | 3.3V to 5.0V DC | | **Output Type** | Analog Voltage | | **Sensitivity** | High sensitivity to solar UV radiation | | **Response Time** | < 0.5 Seconds | --- ### 2. Internal Electronic Structure The ME26XBG-R is not just a raw sensor; it is a **module** that includes signal conditioning circuitry: 1. **Photodiode:** The primary sensing element that converts UV photons into a very small micro-ampere current. 2. **Operational Amplifier (Op-Amp):** Because the raw current from the photodiode is too weak for a microcontroller to read, an onboard Op-Amp converts this current into a measurable voltage (Transimpedance Amplifier). 3. **Filter/Lens:** The "BG" in the part number often refers to the **Blue-Green** or specialized glass filter used to block visible light, ensuring the sensor only reacts to UV wavelengths. 4. **Passive Components:** SMD resistors and capacitors used for power decoupling and gain setting. --- ### 3. Pinout and Integration | Pin | Function | Description | | :--- | :--- | :--- | | **VCC** | Power Input | Connect to 3.3V or 5V. | | **GND** | Ground | Common ground. | | **OUT** | Analog Signal | Output voltage proportional to UV intensity. | #### Implementation Example (Arduino) To use this part, you connect the **OUT** pin to an Analog-to-Digital Converter (ADC) pin. ```cpp int uvPin = A0; // Connect ME26XBG-R OUT to A0 void setup() { Serial.begin(9600); } void loop() { int sensorValue = analogRead(uvPin); float voltage = sensorValue * (5.0 / 1023.0); Serial.print("UV Voltage: "); Serial.println(voltage); delay(500); } ``` --- ### 4. Common Applications * **UV Index Meters:** Handheld devices to check the sun's intensity. * **Flame Detection:** Identifying the UV signature of a flame in industrial burners. * **Weather Stations:** Part of a multi-sensor array for environmental data. * **Medical/Laboratory:** Monitoring UV sterilization lamps (UVC detection capability depends on the specific filter glass used).