The UV Sensor is a device designed to detect the intensity of incident ultraviolet (UV) radiation. UV radiation consists of wavelengths shorter than visible light but longer than X-rays. UV sensors are essential in various applications, including automotive, pharmaceuticals, and robotics. They are available in pre-wired modules suitable for both amateur and professional engineers. These modules facilitate the detection of UV radiation intensity, such as the UV radiation found in sunlight.

 The module, operating in the 200-370nm UV detection wavelength range, generates a calibrated analog voltage that varies with UV light intensity. This makes it suitable for interfacing with any microcontroller unit (MCU) through a single analog-to-digital converter (ADC) channel.

Key Specifications and Features:

• Working Voltage: 3.3V to 5V
• Output Voltage: 0V to 1V (corresponding to 0 to 10 UV Index*)
• Detection Wavelength Range: 200nm to 375nm
• Operating Temperature: -20°C to 85°C
• Measuring Accuracy: ±1 UV Index
• Size: 19.8mm x 15mm

The UV Sensor module utilizes the renowned GUVA-S12SD photodiode, which is a Gallium Nitride material-based Schottky-type photodiode optimized for photovoltaic mode operation. The module also incorporates an Op-Amp, a rail-to-rail input and output voltage feedback amplifier. This Op-Amp operates with a wide input common-mode voltage range and provides a minimum operating supply voltage of 2.1V and a maximum recommended supply voltage of 5.5V. Additionally, it offers a bandwidth of 150kHz while consuming only 4.7µA of current.

The circuit diagram of the UV Sensor Module includes the GUVA-S12SD photodiode and the SGM8521 Op-Amp. The primary remaining component of uncertainty is resistor RX, which is labeled as 310 (some modules use a 10M resistor at this position). Further insights from readers are welcomed to clarify this aspect.

This UV Sensor Module presents a versatile solution for accurately measuring UV radiation intensity, with potential applications spanning from health and safety to environmental monitoring and beyond.