Subject:
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Re: RCX and R/C combined
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 9 Apr 2005 18:02:11 GMT
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Viewed:
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1025 times
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In lugnet.robotics, Steve Lane wrote:
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I’ve just been experimenting with my RCX to see if it can sense the output
from the Lego RC unit.
The experiment was fairly successful, I was just wondering though if putting
9v into a sensor port does it any good. Are their any risks in making such a
connection?
I got a beep when I applied negative current.
Any thoughts?
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Hi Steve,
I built this little resistor bridge out of 10K resistors for a similar
application:
Note: You can’t see it in the photo, but the 1x4 electrical plates on the
underside of the 2x4 plate have been cut in half so you can attach a 2x2
electrical connector to each side.
Just wire the bridge between the output of the RC receiver and the RCX input:
The raw sensor values correspond to the RC output as follows:
forward = 110 (9 volts)
stopped = 440 (0 volts)
reverse = 710 (-9 volts)
The above are for full power forward/reverse. Fractional power levels are
implemented using PWM on the RC receiver, so you see the sensor value rapidly
jumping between the full power and stopped readings. I suppose throwing a
suitable capacitor into the circuit would give you nice stable readings for the
in between power steps.
Cheers,
(Another :-) Mark
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Message is in Reply To:
 | | RCX and R/C combined
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| I've just been experimenting with my RCX to see if it can sense the output from the Lego RC unit. The experiment was fairly successful, I was just wondering though if putting 9v into a sensor port does it any good. Are their any risks in making such (...) (20 years ago, 8-Apr-05, to lugnet.robotics)
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