Some notes regarding the UV Integrating Exposure Timer by David Swinnard

Included in the zip file are the following
    1. Schematic diagram - as built
    2. UV_Timer_08 folder with the Arduino source code and a readme file
    3. Images of the project as built inside and out
    4. Video of the breadboarded project (using a UV diode - purple as exposure
       source). The "load" (UV exposure unit) is represented by the blue LED.
       
I built this to see if I could. It's currently in the darkroom controlling my UV box and hasn't had too much use yet as I've been procrastinating.

As noted in the code comments much was derived from device libraries written by others in the Arduino world saving me (NOT an experienced programmer, just a hack) from reinventing the wheel.  I added the glue-the-bits-together code to make things work the way I wanted. I have a background that includes a stint in the world of electronics so I was not unfamiliar with the hardware/software involved - just way out of practice.

NOTE:  I am providing this information for your use. I offer no warranties or guarantees of any sort.  I'm a hack and this is what I did, and I'm happy with it (so far).  I do not know if you will be.

WARNING: There are AC line voltages involved in this project - These voltages are potentially LETHAL. Do not build this in you are unsure of safe working practices.

It goes without saying that I will answer any of your questions as best I can.