Tag Archives: UV

Arduino UV Meter using the UV30A Ultraviolet Sensor

Ultraviolet rays, also known as UV for short are rays emitted by sun. Due to the depletion of the ozone layer, these rays tend to get to extreme levels that could lead to sunburns etc for those under it, that’s why daily and hourly forecast of the UV index is always available to help people keep track and stay safe. For monitoring purposes, why not own a personal UV meter?

Today, we will build a UV meter using the Arduino and the ultraviolet sensor (UVM30A) with a Nokia 5110 LCD display as the display for the meter. The Nokia 5110 is used to display the UV index which is an international standard unit for the intensity of ultraviolet rays from the sun being experienced in a particular place and at a particular time.

Arduino UV Meter using the UV30A Ultraviolet Sensor – [Link]

World´s Smallest Wearable Made to Help Prevent Skin Cancer

Wearables are devices that incorporate and interact with different parts of our bodies and perform a specific task. The tasks can be to improve our health (count steps, heart rate etc.) or to make our life easier (GPS, smartwatches etc.). Technology industry has dominated the wearable market since its easier for a technology company to produce technologic devices, but other companies have joined the trend and now companies in the textile, fashion and medical industry started producing their own wearables with specific purposes. L’Oréal the world leader on makeup, cosmetics skin care etc. has now joined the race.

In a research project with Northwestern university, the world´s smallest wearable was created. Measuring less than an M&M in circumference and weighting less than a raindrop this device was designed to measure UV exposure of the user to reduce skin cancer by modulating their exposure to the sun. UV Sense has no battery, no moving parts, its waterproof, and it can be attached to any part of the body preferably a location with good sun exposure.

The device connects to an app that shows you the exposure you have had in a day or over a period. Also, the app can be configured to send notifications when users exceed daily safe sun limit.

According to the skin cancer foundation “Each year in the U.S over 5.4 million cases of nonmelanoma skin cancer are treated in more than 3 million people, and each year there are more new cases of skin cancer”, but with this device skin cancer could be prevented instead of treated. The researchers at Northwestern have received roughly 2 million grant from the National institutes of Health to deploy fingernail UV sensors.

The device is undetectable which will encourage people to use it, and as it requires no batteries, users do not need to worry about charging the device or forgetting to do so. This means that people can now be warned about sun exposure and will be able to take measures to prevent diseases with no effort at all. The same research team is also working on other devices that could help check other health aspects to increase awareness about different diseases and the daily activities that may cause them.

[Source]

Open Source UV Index Detector

Boris Landoni @ open-electronics.org documents his UV index detector.

It measures solar radiation and visualizes the corresponding value on the integrated display of a miniaturized Arduino, in order to tell us when to expose ourselves to the sun…

Open Source UV Index Detector – [Link]

Sunburn Monitor – A UV monitor

Sunburn Monitor is a UV monitor with sound-based indication. It calculates the max sun exposure before sunburn based on your skin type.

The project was published over hackaday.io by [Quarterturn].

SunBurn_SCH

It’s based around SI1132 light sensor from Silicon Labs. SI1132 is a UV index and ambient light sensor with I2C interface and it’s available in 10-lead 2×2 mm QFN package. Sunburn Monitor uses ATMEGA168 MCU where the firmware was developed using Arduino environment.

The design has a protection transistor Q1 (DMP2035U-7) in the input, we covered in a past blog how to protect you circuit from reverse voltage, and Q2 is used to enable/disable the supply voltage of the sensor.

Sunburn Monitor powered by a 3v CR2032 battery with power management relies primarily on either deep sleep via hardware interrupt or watchdog timer interrupt for sleep-wake-sleep monitoring cycles, according to [Quarterturn].

sunburn_PCB

sunburn_top

The source code and the design files, using Eagle CAD, (SCH & BRD) can be found here.
[Project page over hackaday.io]

Mid-power UV LED operates at 365 nm

Vishay VLMU161

A ceramic-based UV LED, the VLMU1610-365-135 from Vishay provides typical radiant power of 18 mW at 20 mA and 50 mW at 60 mA over a wavelength range of 362.5 nm to 370 nm. The silicone lens of the device enables extremely long lifetimes of up to 25,000 hour, compared to typical mercury lamp lifetimes of 10,000 hours. by Susan Nordyk @ edn.com

Housed in a compact 1.6×1.6×1.4-mm surface-mount package, the environmentally friendly VLMU1610-365-135 is free of heavy metals and provides increased reliability with its shock resistance and immunity to degradation from frequent on/off switching. Aimed at medical, industrial, and printing applications, the LED allows the use of simple low-voltage circuitry and requires no warmup period. The VLMU1610-365-135 has a forward current of up to 60 mA and achieves an angle of half intensity ±67.5° at 20 mA.

Mid-power UV LED operates at 365 nm – [Link]

Count down timer for UV lamps using PIC16F887

Piccounter

Here is a countdown timer for UV exposure lamps @ cuteminds.com

Here follows a simple count down timer useful for the production of pcbs using photoresist and UV lamps. We have used a pic 16F887 Microchip microcontroller; there are no particular reasons, we have simply used the picmicros available at the moment.

Count down timer for UV lamps using PIC16F887 – [Link]