Here you can find the schematics, PCB, BOM, and the firmware:

https://drive.google.com/folderview?id=0B7tTimpGxVq4ejRBX2FuVW1ZNnc&usp=sharing

File list:

- expo.hex - firmware (Intel hex file)

- PowePanel.bom and TimerPanel.bom - list of components for the two electronic boards.

- SCH_logic, SCH_UV_power - schematics for power panel and timing and control electronics.

- PCB_logic,  PCB_power   - top and bottom layer and component placement (1:1 size)

I have used the following UV leds: LZ1-00UA00   (click on the link for more info)

Building and bring up:

    

    First construct the the chasis and build the power panel and the lighting mast with the UV leds mounted on it. Test it if all the voltages are correct (especially test J3 pin 1 for 5V  -see the schematics).

Try out the control for UV and ambient leds and for the cooling fan by shorting on J3 the following pins: 1 with 2 / 3 / 4.

For safety try out the current regulator with a 12V 50W lamp first - it should hold ~1.15A. this way we are sure we don't burn out those expensive UV leds.

    

    Now the timer board. Here we need an ISP programmer for the Atmega8.

Check for shorts and interruptions, connect with the power board, connect the programmer, set the fuse bits for external high speed crystal oscillator, without internal ck/8 divider; optionally the brown out detector can be activated to prevent eeprom corruption on power spike when switching off. Flash the provided expo.hex file and disconnect the programmer. It should start up in standby mode with 07:00 on display.

User manual:

Buttons:

      - left:   Start / Stop         (S)

      - right upper:  + button   (+)

      - right lower:  -  button   (-)

      - right middle:  menu button   (M)

Modes:

   - Standby (default):  

      button (S) will start the exposure, switches off the ambient light, waits 4 seconds and starts the UV.

      button (+)/(-) sets the timer -> set the secods, press (M), set the minutes, press(M) -> Standby

      button (M) enters in menu

   - Exposure:

      button (S) stops the exposure -> Standby

      button (+)/(-) adjusts UV power on-the-fly. It isn't memorized

   - Menu:

      button (+)/(-) select the following menu elements:

              - Upwr:  UV power in 10% steps

              - Apwr: ambient light power in 10% steps

              - Disp: display brightness in 10% steps

      button (M) enters in the selected menu point

      button (S) exitst from menu

Menu points are set by (+)/(-),  (M) will exit to the menu, (S) will exit to Standby, each of them saves the setup in eeprom.

Have fun.