{"title":"SparkFun Mini Spectral UV Sensor - AS7331 (Qwiic)","handle":"sparkfun-mini-spectral-uv-sensor-as7331-qwiic","url":"/products/sparkfun-mini-spectral-uv-sensor-as7331-qwiic","description":"The SparkFun Mini Spectral UV Sensor features the AS7331 from ams OSRAM, measuring ultraviolet radiation across three dedicated channels: UVA (320–400 nm), UVB (280–320 nm), and UVC (200–280 nm). Each channel has its own photodiode with built-in interference filter for high sensitivity and accuracy.\n\nThis Qwiic Mini breakout (1 × 0.5 in.) communicates over I²C and includes two Qwiic connectors for solderless daisy-chaining, plus a 0.1\"-spaced through-hole header with Interrupt and Sync pins. An Arduino library is available for quick setup via the Library Manager — search for \"SparkFun AS7331\".\n\nKey Features\n\n\nThree UV Channels – UVA, UVB, and UVC with dedicated photodiodes and interference filters\n\nFour Operating Modes – Single Measurement (CMD), Continuous (CONT), Synchronized Start (SYNS), and Synchronized Start/End (SYND)\n\nHigh Dynamic Range – Up to 3.43×10¹⁰ (resolution × gain range)\n\nUltra-Low Power – 1.42 mA active, 970 µA standby, 1 µA power-down with automatic power-down between measurements\n\nQwiic I²C Interface – 2× Qwiic connectors for solderless assembly, plus through-hole header\n\nFour I²C Addresses – 0x74 (default), 0x75, 0x76, 0x77 via A0/A1 solder jumpers\n\nCompact Form Factor – Qwiic Mini footprint at just 1 × 0.5 in.\n\n\nSpecifications\n\n\nSensor – ams OSRAM AS7331\n\nOperating Voltage – 2.7 V to 3.6 V\n\nCurrent (Active) – 1.42 mA typical\n\nCurrent (Standby) – 970 µA\n\nCurrent (Power Down) – 1 µA\n\nInterface – I²C (Qwiic compatible)\n\nBoard Size – 1 × 0.5 in.\n\n\nIdeal For\n\nUV index monitoring and environmental sensing\nUV sterilisation effectiveness measurement (UVC)\nWearable sun exposure tracking\nScientific and industrial UV analysis\n\n\nResources\n\nHookup Guide\nAS7331 Datasheet\nSchematic\nBoard Dimensions\nEagle Design Files\nArduino Library (GitHub)\nHardware Repo (GitHub)\n","vendor":"SparkFun","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":1213,"title":"Default Title","sku":"SF-SEN-23518","mpn":"SEN-23518","price":69.9,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}