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Unread 23-06-2002, 23:17
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Re: wheel speed & ground speed sensors.. ..and a current sensor

Posted by Thomas A. Frank.

Engineer on team #121, The Islanders/Rhode Warrior, from Middletown (RI) High School and Naval Undersea Warfare Center.

Posted on 6/30/2000 9:14 AM MST


In Reply to: wheel speed & ground speed sensors.. ..and a current sensor posted by Joe Johnson on 6/27/2000 3:35 PM MST:



: Two very obvious improvements would be to be able to know wheel speed and to know ground speed.

Hello All;

I agree wholeheartedly with Joe - these things would be great. They are also surprisingly easy to implement...so I've suggested to FIRST that maybe they should allow us the use of any off the shelf analog or digital IC (maybe specify the catalogs we can use)...with a frequency to voltage converter IC and a reed switch on a shaft, we get RPM (speed) as a DC voltage which can be input directly to the RI analog port...current sensing can be done with a coil and an op-amp with some filter caps (current shunts are a bad idea if you plan on inputing to the RI)...a photo transistor could be used as a trigger for things...it would be more fun for the EE's... :-)

Tom
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