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Dec
20
Written by:
Gary Holbrook
12/20/2008 7:11 PM
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 exposing, developing, and etching them. Getting them lined up wasn't as bad as I expected. The alignment was off a bit, but one of the boards turned out nearly perfect.
Since the drill bit is tiny and relatively expensive, I used a piece of plastic cutting board under the circuit board.
And, of course, there is a video too:
http://www.youtube.com/watch?v=GbFfrd--yWI
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