I got the boards back from Seeed about a month ago and was waiting on the delivery of the GUVA-512D sensors from China. Wish I could afford to buy them direct from Roitner Technik, but not at >$5 each.

Once the UV photodiodes arrived, I built a board. It makes little sense to order a stencil so early on when there are bound to be mistakes, so I just put a fine needle on the solder paste syringe and crushed my thumb squeezing it out onto the pads while watching through my Wolfvision VZ-8light4 at highest magnification.

Quick trip to the reflow oven, and... it did not work! One quick blip from the LED is all I got upon inserting the battery.

Such a simple board! What could have gotten screwed up? I had to look at my schematic and veroboard prototype for a while, but it finally dawned on me I'd assigned the power/wake button to the wrong pin. I think this was due to copying my Sunburn Monitor code and design, where there were two buttons (50/50 chance to screw up and copy the wrong one).

Not the best result, since the board has the button on PB3 vs PB2 where nice INT0 is available. I was able to find a working example of wake on pin change interrupt for PCINT3/PB3. I guess there's really nothing wrong with it, I just prefer waking up on INT0 if possible. Oh well this will be fixed in rev 0.2 of the board. 

The LED was a bit of a surprise. It was described as 'edge view'. I was hoping it would mount with the die facing the side, but what it means is that the die is in a little clear box pointing up with the pads on the bottom, and you can see the die light up from all around.

I took it outside in the rather weak winter sun, and it is clearly visible. I'd prefer a cheaper LED and one in a bigger package, but this will do for now.