RCX programmable brick : 2203


Robotics / RCX / 2203	2202 \| 2204

Subject:	Touch Sensor resistance versus button displacement
Newsgroups:	lugnet.robotics.rcx
Date:	Thu, 11 Sep 2003 19:19:55 GMT
Viewed:	3925 times

Here is a chart showing the variation of contact resistance of several touch sensors while pressing button very progressively.

There are huge differences between various sensor
Lightly pressed touch sensors have contact resistance in the 2 to 5 KOhms range.
Fully depressed resistance varies (for the samples I measured) between 400 and 560 Ohms

Photographs of the test contraption: Top view Touch sensor close-up

Philo

Message is in Reply To:

		Re: Multiplexing 4 touch sensors on an RCX input port
(...) I have tried this method too, and as you say in your text, it is plagued by the rubber contacts whose value goes down as more pressure is applied to the switch. I measured resistance of several touch sensors while applying a very progressive (...) (21 years ago, 11-Sep-03, to lugnet.robotics.rcx)

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