Wave UV Sensor Module - GUVA-S12D, Analog Out

The GUVA-S12SD ultraviolet (UV) sensor uses a photodetector to detect UV radiation and is designed to accurately detect and measure UV radiation, UV radiation is in the electromagnetic spectrum between 100 to 400 nanometers (nm). UV radiation is not visible to the human eye, however it can be harmful as it cause sunburn and skin cancer. The sensor board has an onboard amplifier circuit with adjustable gain to boost the output level. 

Our sun emits UV radiation across the 10 to 400 nm spectrum. At the edge of Earth’s atmosphere sunlight consists of approximately 50% infrared (IR), 40% visible, and 10% UV light. By the time it reaches the Earth’s surface, with the sun at its highest point, the composition of the sunlight is 53% IR, 44% visible, and 3% UV. Of this 3% of UV that reaches the ground, approximately 95% is UVA and 5% is UVB. Of course, these percentages vary somewhat with cloud cover and other atmospheric conditions. Much of the UVC wavelengths are absorbed by oxygen in the upper atmosphere which then generates ozone in the ozone layer. The ozone layer blocks most of the UVB and the remainder of the UVC not already absorbed by oxygen.

Quick Spec

• UV Sensor IC: GUVA-S12SD
• 1st Stage Op Amp: SGM8521
• 2nd Stage Op Amp: LM358
• Adjustable Gain: Yes
• UV Sensitivity Range: 200-370nm
• Dimension: 22 x 16mm
• Mounting holes size: 2.0mm

Board Layout

• VCCL 3.3-5.0V
• GND: Ground
• AOUT: Signal Out 

GUVA-S12D UV Sensor Responsivity Curve

The output voltage of the UV sensor increases with the increase un UV intensity. The maximum output voltage of the UV sensor is 2-3V. When the ultraviolet intensity is at the minimum the output voltage may be in the range of 0.01-0.1V. It's recommended to test the module outdoor in full sunlight  or radiate the module with UV LED.

Resources

• Product Wiki
• GUVA-S12D UV Sensor Datasheet 
• Schematic
• Code

Shipping List

• 1 x Wave UV Sensor Module - GUVA-S12D, Analog Out
• 1 x Jumper Wire - 3way