SparkFun Spectral UV Sensor (AS7331)
Three-band ultraviolet sensor (UVA, UVB, UVC) on a SparkFun Qwiic board. 3.3 V only.
No shop listed yet
Say it to PAL
“Tell me when the UV light gets strong.”
The code PAL writes
p.onSensorChange('sparkfun-as7331', 'uva', (uva) => {
if (uva > 20000) p.log('Strong UVA');
});
await p.waitUntilStopped();Good to know
- The part is 3.3 V only: on a 5 V Grove port use a Grove-Qwiic hub with its own 3.3 V regulator.
About it
The ams OSRAM AS7331 measures ultraviolet light in three bands, UVA, UVB and UVC, as 16-bit counts over I2C at 0x74-0x77. SparkFun sells it as the Spectral UV Sensor in a 1x1 inch and a Mini board, both with Qwiic connectors and no regulator: the part is specified for 2.7-3.6 V only.
Where to buy
No shop listed yet.
Facts
Tested
It is in our catalog, but nobody has checked it on a real board. It may not work yet. Its driver is written, but it has not been tested on hardware yet.
I2C address
The SparkFun Spectral UV Sensor (AS7331) answers at I2C address 0x74. A jumper or pin moves it to 0x75 or 0x76 or 0x77.
Free to reuse
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This record was last changed on October 25, 2026.