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Adafruit AS7331 UV / UVA / UVB / UVC Sensor Breakout - STEMMA QT / Qwiic
The Adafruit AS7331 UVA / UVB / UVC Sensor Breakout is a perfect solution to UV sensing, no matter what 'type' you're sensing. Most UV sensors do just UVA, maybe ambient light too. But the AS7331 can read and differentiate between all the three bands. That means you can use it for human and agricultural UV alerts that tend to focus on UVA and UVB as well as agricultural, germicidal, curing, and other UVC use cases. We particularly like that the three measurements are separated not just mixed together into one number.
The AS7331 has many gain and conversion settings configurable over I2C which means you can measure up to 349 mW/cm² on UVA channel, 386 mW/cm² on UVB and 169 mW/cm² on UVC at 1x gain, and with a responsivity as low as 2.38 nW/cm² per LSB.
In addition to the basic I2C connection, there's also the ability to change the default I2C address from 0x74 using the two jumpers on the back so you can have up to four sensors on the same bus. We also break out the READY pin that will let you know when a sensor conversion is complete, and the SYNC input, which can be used to synchronize the readings with an external pulse.
User Manual / Datasheet / Example Codes Etc.
Features
- AS7331 spectral UV sensor for UVA, UVB, and UVC measurement
- Measures three ultraviolet wavelength bands independently
- Digital sensor interface via I²C
- STEMMA QT / Qwiic compatible for easy plug-and-play connections
- Compact breakout board suitable for embedded and portable designs
- Useful for UV monitoring, environmental sensing, research, and IoT applications
- Supports microcontrollers and development boards with I²C connectivity
- Designed for accurate ultraviolet light intensity measurement
Package Includes
- 1x Adafruit AS7331 UV / UVA / UVB / UVC Sensor Breakout - STEMMA QT / Qwiic
