UV-badge

Some information for the low power challenge:

According to the past years experiences, the device is capable to run for more then 1.5 YEARS (!) on a CR2016 coin cell battery!  It's half size of the most common cr2032

Don't forget, that the device takes environmental measurement in every 15 min, however the display operates only on user interaction.

You can buy the last sample pieces for $55 / item. (postage included)

The adapter clip for the in-system-programmer will be $10 / piece. The adapters will be shipped few weeks later, because those are out of "stock".

Features:

- temperature measurement: °C / °F

- barometric pressure: mBar

- altimeter: meter / feet ( you can zero the altitude value, and the device will show you the difference when you eg. climb a hill, or go up to a skyscreeper)

- UV index

- the device takes a measurement in every 2 sec when in active mode, after 30 s left unattended falls to sleep, but takes measurement in every 30 min. so you can have an ~12 hour chart of measure data.

The "UV index hour" ( UVIh - the accumulated or summed UV index) was removed, because after some experiments I found it quite useless (the device should face very precisely directly towards the sun for hours to get acceptable result)

Anyway you can measure the actual UV index by turning the sensor directly in the sun direction.

Short VIDEO of the current firmware in action:

Check out the latest firmware on github: https://github.com/x-labz/UV-badge/tree/master/firmware/v4.0

...for the firmware V4: https://github.com/x-labz/UV-badge/blob/master/doc/uv-badge-usersguide-v4.pdf

With the new improved battery management feature the device enters 'sleepwalking' mode after 30 sec. In the sleepwalking mode the display is not refreshed but the data is still acquired for the log.

Let's compare the operation modes:

With this custom firmware the UV-badge sensor hardware can be used as a precision ALTIMETER!

Check out the elevator test:

The new v2.1 firmware implements the unit change function. Using the left-hand button, you can change the temperature unit from °C to °F, and back.

The barometric pressure can be displayed in mBar and mmHg as well.

Play arcade game on the UV-badge hardware!

~20 FPS @ 8 MHz.

Only 6.5 KB ROM and 145 B RAM is required.

...and remember, there is no frame-buffer! The application generates the picture line-by-line for every frame. The CPU can't store the whole picture in it's small RAM, and the LCD is "write only'' , you can't read the data back!

The sample devices for the 'best product' category are fully assembled. They will be shipped with UPS.

The sample devices are ready for #bestproduct prize. The 3D printed cases are still in production.