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In lugnet.announce.moc, Philippe Hurbain wrote:
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I finally rebuilt Bob Kojima’s
rolling ball clock with RCX control (and other minor modifications)
Description of these modifications, program, photos, videos are
here
Special thanks to Bob for the time spent to LDraw his wonderful model!
Philo
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I love it! Very nicely done!
It was interesting to read this bit off your website--
“
The problem should have been very simple: each minute, start the elevator until
a ball is detected by one sensor. Unfortunately, my first try over a several
hours period showed me that my clock was fast, several seconds each hour! After
eliminating all mechanical possibilities (two balls at a time, or an undetected
ball), I concluded that my RCX itself was fast... To make sure, I finally put a
frequency meter probe on RCX crystal, and indeed it oscillates at 16.03 MHz
instead of 16.00 MHz. So I finally added some code to wait for 6.92 seconds each
hour. ”
This explains much to me--I have an 1.0 AC’d RCX that’s been on for months but
almost weekly I have to reset the clock. Thanks for the info on the fast clock!
Take care,
Dave K
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