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Smart
Joined: 28 Jan 2006
Posts: 96
Helped: 1
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 10 Mar 2007 15:52 open a parking gate with PC |
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Hi,
I want to control a parking gate (24 volt relay) with a pc.The distance between pc and barrier gate is 30 meter. At first please let me know should I use microcontroller or RS-232 can control the relay itself. then please send me the needed schematic and source code.
regards
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auto_mitch
Joined: 14 Oct 2004
Posts: 212
Helped: 20
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10 Mar 2007 17:46 Re: open a parking gate with PC |
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i think that the RS-232 port can't drive by itself a 24 VDC Relay without interface. Have a look at the following site http://www.tkk.fi/Misc/Electronics/circuits/rspower.html
but i prefer as a solution the usage of a micro controller system.
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10 Mar 2007 17:46 Ads |
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yogi
Joined: 08 Jan 2005
Posts: 345
Helped: 17
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12 Mar 2007 10:19 open a parking gate with PC |
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for controlling relay with parallel port
http://booksbybibin.14.forumer.com/viewtopic.php?t=68
But parallel port cable max distance is less than 5m, you better go for wireless or some rs-485 type interfacing
Bibin John
www.bibinjohn.tk
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Faros
Joined: 02 Jul 2005
Posts: 10
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12 Mar 2007 11:50 Re: open a parking gate with PC |
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| The relay can be powered with 24V at the gate, and the signal can be interfaced to transistor base that is connected as an open collector switch, this will switch this relay, it is a standerd MCD apps.
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