RFID Counter

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JohnReacher
Posts: 1
Joined: Wed Jun 20, 2018 10:40 am

RFID Counter

Post by JohnReacher » Wed Jun 20, 2018 10:46 am

I want to count, maybe with OpenLog, or even a digital readout (7segment display?) when an RFID badge is scanned by my SparkFun RFID reader... I want it to be small as possible. OpenLog would be great, not sure if I use the "LED" light (turns on when a card is presented) as the trigger or if there is some other way. Basically don't want to read the card, but just the fact that someone presented the card, I want to tally that. Seems simple, I'm just not sure how small I can make such a counter, openlog is what I'm shooting for, but again I don't want to write down card details necessarily... in fact I'd like to avoid it.

madbodger
Posts: 9
Joined: Sun Feb 13, 2011 6:37 pm

Re: RFID Counter

Post by madbodger » Thu Jun 21, 2018 1:44 pm

Which RFID reader? SparkFun offers a few different options. It's possible that there's a "card detected" sort of output you could use.

jremington
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Posts: 2268
Joined: Fri Jun 15, 2007 9:41 pm
Location: Eugene, Or

Re: RFID Counter

Post by jremington » Thu Jun 21, 2018 7:31 pm

use the "LED" light (turns on when a card is presented)
If there is such a light, go ahead and use it.

You could replace the LED with the input to an optocoupler, or tape a photocell of some sort over the LED, and use either as an input to a micro for logging.

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