diy uv exposure box for pcb - arduino controlled

In this video you will see an ultraviolet exposure device i built a few months ago. it is controled by an arduino pro mini and has a 7 segment display to show the set and remaining exposure time. it uses cheap ultraviolet leds(49 total)but does its job perfect!!.
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schematics and arduino code can be found here :
https://diy-circuits-electronics.blog...

music : Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...