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Need some help
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Jangel01 View Drop Down
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Posts: 9 		Post Options Post Options   Quote Jangel01 Quote  Post ReplyReply Direct Link To This Post Topic: Need some help
    Posted: 01 May 2010 at 6:20pm
Ok so i bought one of the RFID readers from ebay but i cant make it close my relay...realy need the help....im new to all the RFID thing so thank you
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amal View Drop Down
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Posts: 1530 		Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2010 at 7:55pm
Hey there, can you specify the reader you bought? Maybe post some pictures and/or URL? Also, if you bought the reader I think you bought, you might want to check out this thread; http://rfidtoys.net/forum/forum_posts.asp?TID=692
Amal ;)
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Jangel01 View Drop Down
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Posts: 9 		Post Options Post Options   Quote Jangel01 Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2010 at 11:06pm
this is the link to a picture of the reader..

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230374841233&rvr_id=&crlp=1_263602_263622&UA=%3F*F%3F&GUID=4cfe1d531280a02681075be7ffea273c&itemid=230374841233&ff4=263602_263622

i have tried everything but it just doesn't close the relay so that it let the current pass through...

What i am trying to do is to make a passive kill switch



But instead of the remote power line im trying to use the readers out put signal...
but i still tried just using a relay to see if it would close it but it didn't work so if there's any mods that i can do to the reader appreciated 

Edited by Jangel01 - 01 May 2010 at 11:09pm
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amal View Drop Down
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Posts: 1530 		Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2010 at 11:56am
Hi there,

I would definitely re-post this to the http://rfidtoys.net/forum/forum_posts.asp?TID=692 thread.
Amal ;)
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Jangel01 View Drop Down
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Posts: 9 		Post Options Post Options   Quote Jangel01 Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2010 at 1:00pm
ok will do but is there any tips that you can give me right now of y it doesnt work
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amal View Drop Down
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Posts: 1530 		Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2010 at 1:05pm
Well, if you can't get the RFID reader to even close a relay all by itself, then have you tried just putting a volt meter on the RFID reader output to ensure power is being supplied when a valid tag is run over the reader? You have programmed the reader with valid tags, right?
Amal ;)
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Jangel01 View Drop Down
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Posts: 9 		Post Options Post Options   Quote Jangel01 Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2010 at 1:22pm
well i have tried hooking it up to a DMM and it reads about 11.86 v and if i hook up the relay and check the voltage it goes all the way down to 4v or even lower some times...

yes sir i have programed the tags
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amal View Drop Down
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Posts: 1530 		Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2010 at 1:24pm
hmm, in the ebay post it shows two readers... did you order/get two readers and have you tried testing both? it sounds like the reader is trying but the load is too great. these readers are pretty much random when it comes to quality and even internal wiring. you might try using a relay with a much smaller coil and current draw and seeing if it is able to close. failing that, i'd contact the seller.
Amal ;)
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Jangel01 View Drop Down
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Posts: 9 		Post Options Post Options   Quote Jangel01 Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2010 at 1:29pm
well no those are not the readers i just got that picture from ebay...i only got one reader....well what kind of rely do u recommend...yea and if it doesnt work i will definitely contact the seller
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amal View Drop Down
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Posts: 1530 		Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2010 at 1:32pm
these readers have a long history. they were manufactured for several purposes, all of which are now defunct. there is a huge stockpile of them floating around, and a few sellers on ebay have modified them to support relay functionality. if you have an original reader, then chances are it can't support a relay directly, and you'll be limited to around 20ma maximum current draw. the only relays i know of that draw that little are 12v reed relays from Radio Shack. you will also need to consider adding a protection diode so a voltage spike doesn't feed back into the reader when the relay is deactivated.
Amal ;)
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