CJMCU-GUVA-S12SD Sunlight Ultraviolet Ray Intensity UV Sensor Module

The module provides a linear analog voltage output. The voltage level on its signal pin increases proportionally with the intensity of detected ultraviolet light in the 240-370 nm range. This analog output can be directly connected to an ADC input pin on microcontrollers like Arduino or ESP32 for measurement.

The module operates from a supply voltage (VCC) between 2.5V and 5.0V DC. This makes it compatible with both 3.3V and 5V logic systems commonly found on development boards like Arduino Uno (5V) or ESP32 (3.3V). Ensure your power source is within this range for stable operation.

Connect the module's VCC pin to Arduino's 5V (or 3.3V), GND to GND, and the analog output (OUT) pin to an analog input (e.g., A0). In your Arduino sketch, use the `analogRead()` function on the chosen pin. The raw ADC value (0-1023) will correspond to the sensor's output voltage, which you can then map to a UV intensity value through calibration.

The integrated Schottky photodiode is sensitive to ultraviolet radiation from approximately 240 nanometers (nm) up to 370 nm. This spectrum covers the UV-B (280-315 nm) and most of the UV-A (315-400 nm) bands present in sunlight, making it suitable for measuring the solar UV index and general ambient UV intensity.