Monday, June 13, 2011

First use of Multi-Purpose PCB (UV timer) - Part 1

This was to be a timer system for UV exposures of DIY PCBs. I have already made up and used the UV board, but it was a bit messy to use (pull the power to turn off).

The idea was to have a button for start/stop, and a rotary encoder for adjusting exposure time. Sadly, the encoder was DOA, so I will order a new one. In the mean time I've coded the display, and found out that the atmega8 doesn't have a PC7 (forgot about that), I had wired it to ground on the PCB. This meant I had to some pair wire instead of the 10-pin header.

The FET works brilliantly, and you can see the UV board hooked up, but not on at the moment. When on, the FET doesn't even get hot to the touch, so no need for a cooling rib.

So before I get a new rotary encoder, all that is left to do is to wire up a start/stop button (reset button is already in place).


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