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> It's basicly made of a touch sensor and a couple wires. The
> blue 1x2 brick keeps the touch sensor depressed. There's an
> internal resistor in the touch sensor of about 500 ohms and this
> does the job handily. (Note: I'm not sure if the other touch
> sensors Lego makes have an internal resistor, you should
> check the resistance if you plan to use one of them).
All touch sensors I measured have a "pressed" resistance between 400 and 600
ohms (depends on touch sensors and on pressure, more pressure meaning lower
resistance).
Actually there is no separated resistor, you get the internal resistance of the
conductive rubber that closes contact.
Note also that Cybermaster touch sensor also has integral "released" resistors,
10K, 12K or 15K according to switch button color (see
http://peeron.com/inv/parts/879)
Philo
www.philohome.com
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Message has 1 Reply:
 | | Re: All Lego Ack Circuit for LDCC
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| Thanks Philippe, I wasn't sure of the characteristics of the Cybermaster touch sensors. Also, I didn't want anyone thinking it was OK to use this guy: (URL) checking the resistance (yeah, I know it looks different, but you never know... :-) Mark (...) (21 years ago, 18-Jun-03, to lugnet.trains, lugnet.robotics.rcx)
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Message is in Reply To:
| | All Lego Ack Circuit for LDCC
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| Hi All, One of the features of the LDCC firmware is the ability to read the configuration variables out of a DCC decoder installed in a train motor. In order to do this, you need to connect a small circuit consisting of one or two resistors from the (...) (21 years ago, 18-Jun-03, to lugnet.trains, lugnet.robotics.rcx)
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