SparkFun Spectral UV Sensor - AS7331 (Qwiic)

The SparkFun Qwiic Spectral UV Sensor, featuring the AS7331 UV sensor from ams OSRAM©, is designed to measure UV radiation across three channels: UVA (320-400nm), UVB (280-320nm), and UVC (200-280nm). Each channel is equipped with individual photodiodes and built-in interference filters, ensuring high sensitivity and accuracy. The sensor operates in four modes: Single Measurement, Continuous Measurement, Synchronized Start, and Synchronized Start & End, with an automatic power-down feature to conserve energy.

The AS7331 communicates via I²C, with the breakout board routing the I²C bus pins (3.3V, GND, SDA, and SCL) to dual Qwiic connectors for easy, solderless assembly. Additionally, the board provides a 2.54mm-spaced through-hole header for those who prefer soldered connections, including the sensor's Interrupt and Sync pins. The sensor supports four I²C addresses, adjustable through A1 and A0 solder jumpers on the back of the board.

An Arduino library is available to help users quickly configure the AS7331 and start receiving UV radiation data. This library can be accessed through the Arduino Library Manager by searching for 'SparkFun AS7331' or from the GitHub repository.

Usage Examples:

Ideal for environmental monitoring, the SparkFun Spectral UV Sensor can be used in applications such as UV index measurement, weather stations, and personal UV exposure tracking. Its high sensitivity makes it suitable for scientific research and industrial applications where precise UV measurement is crucial.

Benefits:

The sensor's ability to measure across three UV channels provides comprehensive UV radiation data, enhancing the accuracy of your projects. The low power consumption, especially in power-down mode, makes it perfect for battery-operated devices. The Qwiic Connect System simplifies the connection process, reducing errors and saving time during prototyping.

Unique Properties:

The AS7331's four operating modes offer flexibility depending on your application needs, while the high dynamic range ensures accurate readings even in varying light conditions. The adjustable I²C addresses allow for multiple sensors to be used on the same bus, expanding the possibilities for complex projects.

Features:

• Operating Voltage: 2.7V-3.6V
• Current Consumption:
  • Active Measurement: 1.42mA (Typ.)
  • Standby Mode: 970µA
  • Power Down Mode: 1µA
• Three UV Channels: UVA, UVB, & UVC
  • Each with dedicated photodiode
• Four Operating Modes:
  • Single Measurement
  • Continuous Measurement
  • Synchronized Start Measurement
  • Synchronized Start/Stop Measurement
• High Dynamic Range: Up to 3.43E+10 (resolution multiplied by gain range)
• 2x Qwiic Connectors
• Four Adjustable I²C Addresses
  • Set through A0 & A1 pins
  • 0x74 (Default), 0x75, 0x76, & 0x77

Documents:

• Schematic
• Eagle Files
• Board Dimensions
• Hookup Guide
• Datasheet (AS7731)
• Qwiic Info Page
• SparkFun AS7331 Arduino Library
• GitHub Hardware Repo

Videos