CJMCU GUVA-S12SD UV Light Intensity Sensor Module with Analog Output

The CJMCU GUVA-S12SD UV Light Intensity Sensor Module is a compact analog sensor board designed to detect ultraviolet radiation from sunlight and other suitable UV sources. It uses a GUVA-S12SD gallium-nitride Schottky photodiode together with an onboard signal-conditioning circuit to produce an analog voltage corresponding to the detected ultraviolet intensity.

The sensor has an approximate spectral detection range of 240–370 nm, covering the UV-B range and most of the UV-A range. Its good visible-light rejection helps reduce interference from normal visible light, making it useful for ultraviolet monitoring applications.

The module has a simple three-pin interface consisting of VCC, GND and OUT. The OUT pin can be connected to the analog input of an Arduino, ESP32, Raspberry Pi Pico, STM32 or another ADC-equipped microcontroller. The module can commonly operate from 3.3V or 5V systems, making it suitable for a wide range of electronics projects.

The analog output changes according to the detected UV intensity. A microcontroller program can process this output to create a UV monitoring system or estimate the UV index after suitable calibration.

Key Features:

• Sensor model: GUVA-S12SD

• Gallium-nitride UV photodiode

• Schottky-type photosensitive diode

• Approximate detection range: 240–370 nm

• Detects UV-B and most UV-A wavelengths

• Analog voltage output

• Recommended module supply: 3.3V–5V

• Three-pin connection: VCC, GND and OUT

• High sensitivity and good stability

• Low dark current and low power consumption

• Good visible-light rejection

• Onboard signal-conditioning circuit

• Easy connection to microcontroller analog inputs
  

Applications:

• UV intensity monitoring

• UV index meter projects

• Sunlight-exposure monitoring

• Outdoor weather stations

• Environmental monitoring systems

• Portable and wearable UV monitors

• UV lamp monitoring

• Smart agriculture and greenhouse projects

• Arduino, ESP32 and IoT projects

• School and college science projects

Note: This module provides an analog signal rather than a direct digital UV-index value. Software calculation and calibration are required for more accurate measurements. It is intended for electronics projects and is not a certified medical or professional radiation-measurement instrument.