Subject:
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Re: Drive a motor using the sensor port - safe?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 28 Aug 2001 19:07:18 GMT
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Viewed:
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1443 times
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Should be OK, the light sensor mode works by measuring the resistance of an
external LDR (light-dependant resistor), so it is designed to cope with the
equivalent short-circuit of a stalled motor.. the only problem might be the
back-emf generated if the motor is forced round, over-voltaging the sensor
circuits, but this is unlikely in most situations.
Phil.
Ka-On Lee wrote:
>
> I accidentaly discovered that when the sensor port on the RCX is set to light
> sensor type, a motor connected to it will run. The motor can only run in one
> direction with a low torque, but it can be useful when you just need the extra
> motion and don't need the sensor input. Also I found that in raw mode, I got
> 1023 when the motor is running free, and then it reduce as I add more friction
> to the motor, and return 0 when the motor was stopped.
>
> My only concern would be that is it safe for the RCX? I could not find any
> information about it in MindStorms RCX Sensor Input Page
> (http://www.alynk.com/usr/gasperi/lego.htm) or in this group, and I have
> forgotten everything in Electronic 1, 2 & 3 right after the last exam. ^_^;
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Message is in Reply To:
 | | Drive a motor using the sensor port - safe?
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| I accidentaly discovered that when the sensor port on the RCX is set to light sensor type, a motor connected to it will run. The motor can only run in one direction with a low torque, but it can be useful when you just need the extra motion and (...) (23 years ago, 18-Jul-01, to lugnet.robotics.rcx)
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