Subject:
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Mechanical relay
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 12 Nov 2008 09:56:53 GMT
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Viewed:
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14254 times
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Hi,
recently i've participated in the Technic Indoor Racing competition. Cars were
controlled using PF IR remotes. I decided to use buggy motors for my car, but
the current limiter inside the IR receiver made this almost impossible (the
limit is around 1A, two buggy motors can take up to 6A). I've decided to connect
the buggy motors directly to BB through Polarity switch and control that switch
with a standard minimotor (connected to a port on IR Receiver) thus creating a
Mechanical Relay.
This worked suprisingly well with no noticeble lag in car responses. The
critical component is the use of two flexible axle joiners
(http://www.peeron.com/inv/parts/45590) which prevent polarity switch full
rotations and return it to neutral once the minimotor stops. They allow for just
enough lag to switch it on.
Here're the instructions:
http://picasaweb.google.com/nikola.tepper/LegoMechanicalRelay#
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