I've been playing with an ATNGW100 lately. The idea is to use the NGW100 to communicate with a peripheral board remotely using an XBee wireless module. Of course, the XBee headers are a non-standard header size. I've got adapter boards, but they have an Octal buffer\driver on them. If I were using a Max232 chip, it would dump low voltage out one side and high voltage out the other. I didn't want to risk the same from the Octal buffer\driver, so I whipped up an XBee adapter board. Naturally, it had 40 tiny holes. What a great chance to play with my mill for PCB drilling. At first, I tried drilling before etching. The idea was that I would lay the mask over the holes. Unfortunately, I filled the pads when I printed the mask...so the alignment wasn't so good. On the next two boards, I decided to drill them after...

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