Subject:
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Re: Chaining multiple RCX's output to input
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 27 Oct 1999 21:01:37 GMT
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Viewed:
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598 times
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Stephen Unwin <lego-robotics@crynwr.com> wrote in message
news:Marcel-1.53-1027194118-0b0y$*c@elmsfarm.demon.co.uk...
> Pop a 10K ohm resistor in series with the motor.
> On my quick test with a variable resistor I got a value of 513 with the
> resistor at 9.7k. With a 10k resistor, the RCX raw value is now
> flickering between 510 and 511.
That makes sense cause the RCX has a 10K pulling the input up to 5V. The
10K you put in series with the motor will put the voltage at half way (2.5V)
which should be around 512. Now when the motor runs in one direction it
adds some to the voltage and in the other is subtracts. I'd think you
wouldn't need to spin the motor very fast to get 2.5V so the velocity range
of the sensor must be pretty low, but it's simple. I also like that you
couldn't get any significant current going into the RCX with the 10K there.
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Message has 1 Reply:
 | | Re: Chaining multiple RCX's output to input
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| I use two resistors in series with the motor (one between the + side of the sensor port and the + side of the motor, and the other between the - side of the motor and the - side of the sensor port). That allows the additional advantages that: - the (...) (25 years ago, 28-Oct-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Chaining multiple RCX's output to input
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| (...) Pop a 10K ohm resistor in series with the motor. On my quick test with a variable resistor I got a value of 513 with the resistor at 9.7k. With a 10k resistor, the RCX raw value is now flickering between 510 and 511. P.S. same with the older (...) (25 years ago, 27-Oct-99, to lugnet.robotics)
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