Adafruit Feather M0 and VEML6075 ultraviolet light sensor circuitpython example

by shedboy71 22nd March 2020

In this example we connect a VEML6075 ultraviolet light sensor to an Adafruit Feather M0 running Circuitpython

First lets look at some information about the sensor from the manufacturers datasheet

The VEML6075 senses UVA and UVB light and incorporates photodiode, amplifiers, and analog / digital circuits into a single chip using a CMOS process.

When the UV sensor is applied, it is able to detect UVA and UVB intensity to provide a measure of the signal strength as well as allowing for UVI measurement.

The VEML6075 provides excellent temperature compensation capability for keeping the output stable under changing temperature. VEML6075’s functionality is easily operated via the simple command format of I2C (SMBus compatible) interface protocol. VEML6075’s operating voltage ranges from 1.7 V to 3.6 V.

FEATURES

Integrated modules: ultraviolet sensor (UV), and signal conditioning IC
Converts solar UV light intensity to digital data
Excellent UVA and UVB sensitivity
Reliable performance of UV radiation measurement under long time solar UV exposure
16-bit resolution per channel
UVA and UVB individual channel solution
Low power consumption I2C protocol (SMBus compatible) interface
Temperature compensation: -40 °C to +85 °C
Output type: I2C bus
Operation voltage: 1.7 V to 3.6 V

This is the sensor I bought

Parts Required

Name	Link
Adafruit Feather M0 Express	Adafruit (PID 3403) Feather M0 Express – Designed for CircuitPython – ATSAMD21 Cortex M0

VEML6075	VEML6075 UVA UVB Solar Ultraviolet Light Intensity Sensor
Connecting cables	Free shipping Dupont line 120pcs 20cm male to male + male to female and female to female jumper wire

Schematic/Connection

feather and veml6075 layout

Code Example

I used Mu for development

The following is based on a library , I copied the VEML6075 library to the lib folder on my Feather M0 Express – https://circuitpython.org/libraries

[codesyntax lang=”python”]

import time
import board
import busio
import adafruit_veml6075

i2c = busio.I2C(board.SCL, board.SDA)

veml = adafruit_veml6075.VEML6075(i2c, integration_time=100)

print("Integration time: %d ms" % veml.integration_time)

while True:
    print(veml.uv_index)
    time.sleep(1)

[/codesyntax]