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"Steve Hassenplug" <Hassenplug@mail.com> wrote:
[snip]
> The biggest problem will be that the standard touch sensors may not be 100% on
> when you press it. This means the sensor itself can provide some resistance,
> depending on how hard you press it.
>
> You can test this by hooking up a touch sensor (configured to display raw
> values) and softly press it. You'll notice, the harder you press it (to a
> point) the more the number changes. (I forget if they go up or down, using the
> standard software/firmware). Then, as you release the button (VERY slowly) you
> see the numbers change, again.
This has always annoyed me about the Lego touch sensors. Has anyone
ever made or seen a contraption that uses the variable pressure
sensitivity of the Lego touch sensors?
Tim
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Tim Auton wrote:
> This has always annoyed me about the Lego touch sensors. Has anyone
> ever made or seen a contraption that uses the variable pressure
> sensitivity of the Lego touch sensors?
>
>
> Tim
I've made one. A wall follower. I set the sensor to raw mode and looked at three
ranges. It tried to stay in the middle range, which for this 'bot meant lightly
touching the wall. The wall follower had a bumper analogous to a highly curved
(180 degrees) insect feeler. The touch sensor was oriented vertically and the end
of the feeler nearest the 'bot moved horizontally over the bump on the sensor. I
think I used a technic #3 angle connector ( http://www.peeron.com/inv/parts/32016
), with the pin hole as the pivot point of the feeler and the side of one of the
ends moving over the bump of the sensor.
IIRC, the ranges I used were around 0-200, 201-900, 900-1023. The sensor's values
tended to hover around 0 at no contact, 950+ at high contact, and 350-500 for
light contact.
-Brian
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