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May 29, 2009, 12:32 PM
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Best etch ever


Lost 1 to the draino. The draino was the same concentration as yesterday but real active for some reason. Then for the next 2 hours, had board after board expose unevenly from 5 minute exposures. After giving up on having any blog material by the next commute, exposed 1 for 20 minutes & it was the most beautiful photoresist in the history of photoresist board torture.

No-one ever used 100W fluorescent spiral lights before so there was no way anyone could guess 20 minutes. Unfortunately, couldn't get it to work before commuting time.

There it is. The most complicated board U can make in gEDA without going more insane than U already R. PCB has the 2nd worst user interface ever made, matched only by Windows itself. Got it down to 28x30mm. It could be much smaller if it was double sided, but we have to subsidize your mortgages.

To program the XBee, we have sort of a header. The PIC has to be in reset mode to override its serial output. The PIC programmer uses the same pins as PWM, a high risk design.
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