Alison,

Having just had another look at your PCB layout, I see that B2 is "Coin Cell Holder" (when all else fails, 
read the instructions! :-)  but it seems to have only a 0V connection.  

This is a Good Thing because if you were planning to connect a coin cell (presumably 3.2V lithium such as a 
CR2032) across 0 and 5V, *don't do it*!

The most likely result would be a loud bang with toxic chemicals being sprayed around... lithium cells can 
react really badly if abused, and over-volting them is serious abuse.

Of course this may be fallout from an earlier design (like the missing D1-D5) in which case please ignore me 
:-)

Cheers,


Howard Winter
St.Albans, England


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