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Forum index » Science and Technology » Engineering » Control
controling a contactor with a secure digital timer ?
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Tim Wescott
science forum Guru Wannabe


Joined: 03 May 2005
Posts: 292

PostPosted: Mon Jul 03, 2006 2:43 am    Post subject: Re: controling a contactor with a secure digital timer ? Reply with quote

RG wrote:
Quote:
I am looking for an inexpensive way to have a user enter a security
code and then enter a timer countdown value that will then activate a
relay or contactor. The access panel could not be tampered with or
timer reset unless you knew the security code. I was thinking a keyed
switch would be the easiest way but would not offer any duration,
simple on or off.
Any ideas on harware - I was thinking os some digital lcd hooked to a
keypad of some sorts. But this is outside my range of expertise.

Thanks in advance

How about a cabinet with a lock? With a window in the door if need be?


There's probably a higher-tech solution available off the shelf, but
sometimes the stone ax approach is still the best.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/

"Applied Control Theory for Embedded Systems" came out in April.
See details at http://www.wescottdesign.com/actfes/actfes.html
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testing
science forum beginner


Joined: 05 Sep 2005
Posts: 7

PostPosted: Mon Jul 03, 2006 1:10 am    Post subject: controling a contactor with a secure digital timer ? Reply with quote

I am looking for an inexpensive way to have a user enter a security
code and then enter a timer countdown value that will then activate a
relay or contactor. The access panel could not be tampered with or
timer reset unless you knew the security code. I was thinking a keyed
switch would be the easiest way but would not offer any duration,
simple on or off.
Any ideas on harware - I was thinking os some digital lcd hooked to a
keypad of some sorts. But this is outside my range of expertise.

Thanks in advance
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Google

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