- posted
15 years ago
-- If you want to do it in hardware you could use a couple of 74XX193\'s feeding an EEPROM with a lookup table burned into it as described
-- If you want to do it in hardware you could use a couple of 74XX193\'s feeding an EEPROM with a lookup table burned into it as described
[snip] [snip]
You could use a multi-turn potentiometer. A 10 turn pot would make it much easier, since a selection would then be 14°, which would be much more manageable. Using a 'heavy' knob, which would keep spinning due to angular momentum would make it less tedious to dial from 0 to 255.
One issue with this approach is that it might change if it is near the cutoff point, or worse, oscillate between two due to vibration.
Another issue has to do with my microwave (that I just dumped today because of terrible interference problem with cordless phones) which had a a spinning knob to select the cook time. It was a free spinning dial, which would change more quickly depending on the velocity of the dial. It was very tedious to use, so while the interface might seem like a good idea, it probably isn't.
(The uWave was a Panasonic 1300W oven, for those who wish to avoid interference. I even went out and bought a 5Gig phone to avoid it, and it actually interfered with the new phone. I'm surprised it passed FCC testing. It must have been spraying EM all over the airwaves to interfere with a 5Gig phone.)
Regards, Bob Monsen
Sounds like a bad seal implementation, hard to get more than 1uW/cm^2 even right on top of the panel or door. Interference that bad could only be caused by insufficient or severely imbalanced tightening of the 'tron' bolts and gasket.. or it may have been something awry with the input filter on that crummy little 36KHz inverter, if it had one of those.
I use Comcast (I know, but it's what's available) and I see only a few spam posts a day here, mostly cheap shoes and that damned islamospammer, with the odd update on the old chain letter.
-- I guess you missed this part about using a single-turn pot and an ADC:
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