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serial - Arduino with Parallax RFID reader storing ...

I am quite new to electronics and have been tinkering around with this Arduino UNO w/ WiFi Shield and the Parallax RFID R/W Module.

Link to the RFID Module: http://www.parallax.com/Store/Accessories/CommunicationRF/tabid/161/ProductID/688/List/0/Default.aspx?SortField=ProductName,ProductName

Link to it's Data Sheet:...

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Related topics : parallax rfid read write module / rfid read write module arduino / parallax rfid card reader serial arduino / rfid read write module / rfid card reader serial parallax

arduino - Electronic pet-door access control - RFID ...

Inspired by projects such as the tweeting cat door and CATaLOG [sic] I'm wanting to add some form of automated access control to our pet door to control who can go in and out, when.

(Full Disclosure: This is a reprint from my blog where I first wrote up the problem, but all feedback is welcome!)

The Players

We currently have three cats, one dog and one pet door.

The Mischievous Mutt

Toby, our two...

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Related topics : door access control rfid / rfid tag detection range / active rfid tag range / rfid tag range / rfid pet door arduino

UHF RFID Read Ranges - Stack Exchange

up vote 2 down vote

I'm going to examine the maths of transmitting power from a point source (the reader antenna) and assume the passive tag has an antenna that can pick-up, rectify and re-use a fraction of this power. This doesn't consider near-field effects/benefits (these may save the day but my gut feeling suggests they won't).

The reader antenna is pumping out +20dBm - that's a power of...

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Related topics : passive rfid tag antenna / uhf rfid tag antenna / rfid tag antenna / uhf near field rfid reader antenna / uhf passive rfid tag reader

What can I do to increase passive HF RFID read range?

up vote 5 down vote accepted

I can only relate my experiences: -

If you want to detect a normally-not-powered passive type tag at extreme distances you have to power to that tag from a significantly bigger magnetic field. Making your magnetic field stronger is the only way I can know (and can recommend). Making your tag more efficient in recovering a fraction of this power is also part of the...

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Related topics : passive rfid tag read range / passive rfid tag distance / passive rfid tag frequency range / passive rfid read range / types of passive rfid tags

What can I do to increase passive HF RFID read range?

up vote 6 down vote accepted

I can only relate my experiences: -

If you want to detect a normally-not-powered passive type tag at extreme distances you have to power to that tag from a significantly bigger magnetic field. Making your magnetic field stronger is the only way I can know (and can recommend). Making your tag more efficient in recovering a fraction of this power is also part of the...

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Related topics : passive rfid tag read range / passive rfid tag distance / passive rfid tag frequency range / passive rfid read range / types of passive rfid tags

rf - When and why did 5.8 GHz become an ISM band ...

up vote 6 down vote

After quite an exhaustive search, I have been unable to determine when the 5.8 GHz ISM band was initially allocated. Although one document implies it was done in 1947 along with the 2.45 GHz ISM band, the ITU document you referenced makes it pretty clear the only ISM bands allocated back then were 13.66 MHz, 27.320 MHz, 40.980 MHz, and 2.45 GHz as you stated.

In 1985, the...

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Related topics : rfid technology uses / applications using rfid