Subject:
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Re: touch sensors - two at a time ?
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Wed, 29 Dec 1999 14:51:02 GMT
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Viewed:
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1404 times
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John P. Looney <valen@nospam.tuatha.org> wrote:
> It's made up as a pair of touch sensors. The idea being that if one is
> activated, it turns around slightly, to avoid the sensor, but if both are
> activated, we should take more drastic action.
>
> However, I tried to do something like
>
> if (SENSOR1 < 0xf000 && SENSOR3 < 0xf000) { both }
> else if (SENSOR1 < 0xf000) { just one }
> else if (SENSOR3 < 0xf000) { just one }
> else { All is OK }
>
> However, if I touch both sensors at the same time, it just accepts one,
> then the other. I suppose it's a race condition of some sort. Any ideas
> how to sort this out ?
If I understand your problem correctly, it has nothing to do with legOS
specifically. Therefore, I will answer, even though I have no experience
with legOS.
The problem is, there is a very small amount of time where, while you're
pushing on the sensors, only one is pressed, and your program is seeing
that one.
The solution that occurs to me is (note this is NQC code...):
if (SENSOR_1 || SENSOR_3) {
Off(OUT_A + OUT_C);
Wait(10); // 0.1 second
if (SENSOR_1 && SENSOR_3) {
...
} else if (SENSOR_1) {
...
} else /* #3 hit */ {
...
}
}
--
Kevin Reid: | Macintosh:
"I'm me." | Think different.
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Message is in Reply To:
 | | touch sensors - two at a time ?
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| I'm trying to build a sensor apparatus at the front of my bot, and it works, mostly. It's made up as a pair of touch sensors. The idea being that if one is activated, it turns around slightly, to avoid the sensor, but if both are activated, we (...) (25 years ago, 29-Dec-99, to lugnet.robotics.rcx.legos)
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