Parallax RFID Reader for Ten Bucks

posted May 29th 2010 6:33pm by
filed under: news, parts, wireless hacks

We  received a tip about Radio Shack putting Parallax’s RFID reader on clearance for around $10. The only reference we could find that indicated Radio Shack sold the reader was a review page. The reader originally sold for around $50 in the stores, so getting it for $10 made it worth a curiosity trip to a local Radio Shack. The store we visited did not have the reader marked down in the drawer, but it rang up for $9.97. It is too bad that the reader was so expensive in the first place, otherwise Radio Shack might still be selling them at full price. This is by no means a promotion, we just though we would share the information in case you were interested in getting one yourself. If Radio Shack is out, you could always build your own reader.

The reader we purchased only came with one tag, perhaps that is why the they have been on clearance. Hooked up to an FTDI USB to serial cable, it would repeatedly send out the tag’s number whenever it was in range. We tried an HID-labeled card and a tag of the kind that can be found in books and DVD cases. Neither worked with the reader, but we’ll keep looking.

Thanks to [bluewraith] for the tip.



102 Responses to Parallax RFID Reader for Ten Bucks

  • AJ says:

    Hey can you guys ammend this posting if you find anything that works with the reader?

  • Ken says:

    HID cards don’t use the standard protocol for the 125KHz frequency.

  • Carlos says:

    What tag type did yours come with? And where in the store did you find yours? If the part number is no good online, will i be able to call in to my local stores to check if they have any in stock?

  • GCL says:

    Hi!
    The one I bought some months ago was already on clearance. As it happens it was only half the regular price and with two RFID cards.

    I imagine there might be something to it.

    Incidentally the cards that you tried may have been set for other frequencies.

  • chango says:

    Got a couple last week, both with some random tags. Fired it right up with a Bus Pirate since I only have 3.3V USB-to-serial converters. Works ok, but I noticed that it will spontaneously spit out bogus codes, maybe 1 every 10 minutes or so. I don’t know if it’s cell phone interference or just some quirk.

    Side note: the tag in books and DVD cases are not RFID. They’re tuned loops that are designed just to set off the detectors.

  • Carlos says:

    Also, HID makes a TON of RFID stuff. Do you happen to know what model/line/classification of tag you were using?

    i have tags from them that work in both the 125 KHZ and the 13.95 MHZ bands, and based on a little research, this parallax reader works with 125 KHZ. If you look at the data sheet parallax provides, they mention ” The Parallax RFID Reader Module works exclusively with the EM Microelectronics-Marin SA EM4100-family
    of passive read-only transponder tags. ”

    Which, according to this data sheet : http://www.digchip.com/datasheets/parts/datasheet/147/EM4100.php

    the em4100 series is 125KHz.

    I do not know if any/all 125KHz chips will work or if the reader is looking for a specific sequence or ID before it sends out the tag it receives.

    I am really looking to make one of the RFID beer fridges they featured on SYSTM a while back.

  • Randy says:

    The Parallax reader works with EM4100-type tags. Parallax seems to be selling them from their site for about a buck each – but Seeedstudio sells them at 5 for $2.50:

    http://www.seeedstudio.com/depot/rfid-tag-combo-125khz-5-pcs-p-194.html?cPath=40

  • xeracy says:

    Bought one at MakerFaire. Was really bummed that of all the tags i had in my room from various objects, it would only read the tags it came with. btw, the package i purchased had some disk tags, 2 cards, and a keychain tag. It cost well over 10$.

  • zerth says:

    @chango Random interference. I forget if it was in the docs or a previous HaD, but comparing 2 successive readings was recommended.

  • Pat says:

    Just picked up 3 today for $10 each. Also buying 5 components got me an additional %25 off.

  • MS3FGX says:

    “a tag of the kind that can be found in books and DVD cases. Neither worked with the reader, but we’ll keep looking.”

    The HaD editorial process is always amazing to me. How does the dude who doesn’t know what RFID is get assigned the RFID article?

    Anyway, I will have to go around the local Radio Shacks and see if they have any of these left. I have seen them on previous trips, but always dismissed them because of cost; though I am pretty sure I saw them for $30 and not $50, so perhaps this has been a steady price drop.

  • bluewraith says:

    I’ve seen elsewhere that they have been marked down for a few months. I picked mine up last week on a parts run. I noticed it hanging there with a sale tag on it and figured what the hell, its only $10. The package had already been opened, so I figured that was why. When I did some more research on it, I found a forum posting stating that all the stores had them on clearance. Some stores may have not updated the shelf talker, but it will still ring up at $9.97.

    I wish my local RS had more. I never messed with RFID before, but at a $10 entry cost I think I have some pretty good ideas on what to use them for. Defiantly going to be on the lookout for them when I travel though.

  • tripp says:

    I can verify this, the Parallax RFID reader and a few other things have gone on Clearance just recently. I remember putting out the tag for it. I’ll get some exact pricing on a couple things tomorrow during my shift.

  • Comrade says:

    I’d love to get my hands on one of these for that price but there isn’t a radio shack for at least a hundred miles from here and there’s no listing for it on their website…

  • bluewraith says:

    @tripp
    I also heard about the TSL230R Light to Frequency Converter being marked down as well, but considering its only a couple of bucks to start with its not as great of a steal. What I’d like to see is the PING))) module come down. My local has about 5 or 6 of those in stock.

    @Comrade
    Get buddy-buddy with someone on a forum somewhere?

  • Comrade says:

    @bluewraith
    I forgot I can play the friend card, I’ve got a couple buddies that live close to one.

  • nutz4hs says:

    @ comrade, drop me an email, see what i can do.

    nutz4hs(at)yahoo(.)com

  • nemo says:

    this is not a hack, and please spellcheck.

  • smash2k says:

    just picked one of these up. plugged into my arduino and it was good to go.

  • Dave Jensen says:

    As stated above, the reader is limited to reading ASK Manchester encoded EM4100/4102 tags only. If you need to read (or clone) HID type access cards then you would need an RFID FSK device like is described at proxclone.com

  • orange says:

    Sure they are $10. Sure they are cheap. But really, how useful is this thing? If it can only read one thing at a time, at very close range, I don’t see why you couldn’t just use say, an analog pin and resistor ladder.

    I am very tempted at $10 but I see no use for RFID.

  • wernicke says:

    @chango,
    a lot of books and dvds do just have tattle-tape, but more and more libraries are using true RFID (13.56Mhz). Those ones won’t work with this 125Khz reader.

  • Nick says:

    Thanks for the post Hackaday!!! I just picked two of these guys up. Time to play! :D

  • sparticle says:

    Anyone have the clearance item number for this thing? The reader no longer turns up in a product search since it’s on clearance. They didn’t have any at my local store and employees need the clearance item number to point you to a nearby store that does have it.

  • hackbert says:

    the one from seedstudios is available for 13 bucks and reads all 125khz tags (even the ATtiny ones ;)… And the 13 Ghz Reader costs 30 bucks there …

  • Haku says:

    Can some kind soul drop some on eBay with international postage please? Here in the UK those readers are £34 (about $50) each!!

  • frolix says:

    Just picked up two of these at the 2nd RadShack I visited. I’m hoping to eventually build a reader/spoofer to get free parking in one of the many overpriced garages near me in Atlanta (or at least clone my roommate’s $68/month pass). I know i’ll need different hardware but these should provide a good starting point.

  • bbsux says:

    Got the last three in my town today.

  • sparticle says:

    Here’s the clearance item number. Call ahead to make sure they have some in stock first, or to find another location that does.

    RFID Sendor Module ($9.97) 2760032

    And yeah, the light-to-frequency converter is on clearance too. Not a huge deal but still cool.

    Light to Frequency Converter ($1.97) 2760034

  • Tim says:

    Thanks for the tip! While they hadn’t changed the price sticker once they scanned it the price came up as 10 dollars.

  • marienbad says:

    FYI:
    At the Davis, CA store, they told me:
    “They were on clearance for $10 but sold out *about a month ago*”

  • Carlos says:

    i just picked up the last 4 at my local radio shack. ill be keeping 1 of them but the other 3 are going up on ebay

  • NatureTM says:

    I also picked one up. Thought about buying the other one they had, but I figured there must be another hack a day reader in my area who could use one. The price was still marked as $50 and I can confirm the markdown will be taken at the register automatically.

    Thanks bluewraith and hack a day!

  • Just picked up one…got it working in <10 mins on a bread board w/ usb to serial converter… It has good range as documented…it does occasionally spit out garbage IDs though… generally with a lot of zeroes…but not too often.

    0F03039100 – good
    C00000C000 – garbage
    F000F00000 – garbage
    F0000F0000 – garbage
    F000000001 – garbage

    Don't have a use for it yet… but at $10 it's nice to have in the parts box. Came with credit card style and disk/token style tags (one of each).

  • My local RS had two… now they have none : p

  • Alex says:

    Thanks for the tip! Just picked up the last one at my local Radioshack.

  • Andrew says:

    Went to Cookeville, TN radioshack – can confirm that it does ring up as ~$10.00 (it was more like $9.90)

    The manager was confused and called up another radioshack to verify. Came out with 2 readers for 25 bucks :)

  • Ian says:

    Grabbed one today in Ohio. $10, not marked. Retail tag was still on for $50. O_O

    Checking another ‘shack or two tomorrow — the one closest to me is closed on Sundays.

  • bbsux says:

    Strange mine all 3 of mine came with 2 credit card sized tags…

  • yellowFun says:

    I picked up one in queen ann seattle. rang up 9.97USD and the guy working there was really confused as to why they’ve sold so many of them lately. Was asking me if there was some weird competition or something going on.

  • NatureTM says:

    Got it working with the Arduino as an auth device. Seems like it has a noticeable read delay but that might just be a quirk in my code. There’s some example code in the Arduino playground, but that wouldn’t have been fun, so I decided to reinvent the wheel. The garbage data hasn’t been an issue since the key transmission is encapsulated by start and end constant bytes. Just have to read the key twice to be sure we’re not authenticating a monkey at a typewriter.

    I’m thinking I’ll throw this into a motorcycle with a push-button starter that only works if I’m sitting on the bike. That should confuse people enough for a little entertainment. I’ll have to make sure that’s legal in my area (or not). Also, I agree with previous posts that the range might be a concern.

  • PocketBrain says:

    Grrr… 2 for 2 on sold out. Gotta map more Radio Shacks in my area. Maybe recruit family members, too.

  • soup says:

    I have been wanting to play with Arduino and RFID, but didn’t think about using them together. This price markdown got me excited, and somehow left the Radio Shack with 7 of the little buggers.

  • Ian says:

    Forgot to mention I only got one tag with mine. Static bag was ripped, though RadioSlack packaging was still intact.

    ALSO

    It would appear the aux chip (EM4095) is capable of writeback via an extra I/O pin that’s currently grounded. And the rest of the unit runs on a PIC16F627A. Interesting.

  • xorpunk says:

    doesn’t work with 90% of RFID standards, it’s not even worth the clearance.

  • Randy says:

    So, xorpunk, you know of a reader that works with 90% of RFID standards for $10?

  • strider_mt2k says:

    I grabbed the last two from my former store.
    As soon as I read the article I grabbed the wife and shot out there to say hi ho to my former boss and grab those things.

    Might be fun in the future.

  • Lars Haeh says:

    Sadly they don’t seem to have this in Canada.

  • zach says:

    i got it the other day, i went to radioshack, got one, brought it hoe, it didnt work, returned it, that one didnt work, returned that one, got a new one, didnt work. RETURNED IT AGAIN, got one with a chip resistor missing, and i finally complained to the manager, he would not refund me because it was supposedly my fault that the chip resistor was not there. i pointed out that this thing looks wave soldered, and there was no solder on the contact pads of the board, he rudely gave me a credit card, with a $3 restocking fee. I will never go back.

    I will never go back their because the service is crap, prices are marked up terribly high, and thier products are failures!

  • Tuckie says:

    I just called the two around my town, and struck out at both locations :(

  • “you’ve got questions, we’ve got blank stares”

    The dude at my store could not even point me to the soldering kits. He showed me the soldering iron, and pointed out that this one had a lot of other stuff included in the bag (solder, pick, wick, etc)

    I found it in the parts drawer. It was not marked down and did ring up as “on sale”. Came with one card tag and a round “world” tag.

    I would not even call ahead, the sales droids don’t even know what a MOSFET is.

    These are not the sales droids you are looking foor

  • MS3FGX says:

    Just bought the three my store had. For $9.97 each they are worth it just to experiment with. Like others said they aren’t compatible with most RFID standards, but at least they come with 2 tags each.

  • PocketBrain says:

    W00t, local store had none in drawer but six in back. I got three. :-D The sales “droid” was at least helpful enough to dig through the back for the thing. Good to know service is still important somewhere. I hope this doesn’t mean the end to components at RS; I would no longer have any reason to come into the store. It has already decomposed into “The Shack” and the next step will probably be “The Shizzack” then “Tha Shizzie” where you can get only cellular phones. Just a prediction.

  • zygomatic says:

    Got one on the west side of Madison, WI for $10, thanks HAD!

  • chee says:

    price confirmed for Monroe Louisiana, louisville ave location. 2 remaining as of right now.

  • Ben Wright says:

    I picked up 2 kits at the Raadio Shack in Rarcho Cordova, CA. Good luck having the staff there know what you are looking for. The staff at this store didn’t even know they carrier parallax products.

  • Nunya says:

    duluth, mn 1 left in parts bin ;o)

  • PocketBrain says:

    DON’T FORGET!!!
    When you get your receipt, do the survey and make sure you tick “Cables, Parts & Connectors” for the main reason you went there. Let your feedback tell them that we aren’t going to let go of a ready supply of electronic parts. Say what you will about selection and price, sometimes you need a resistor or 741 op amp or some alligator clips today!

  • knuckles904 says:

    I can confirm the price of 10$ great deal plus no shipping

  • NatureTM says:

    Picked up 2 more today. I figure if I’m going to carry around an rfid card for one reason, why not use it for a couple more things.

  • sh33pd4wg says:

    Left one behind at the store in Washington, MI. $9.97/ea.

  • boondaburrah says:

    Struck out at first, but picked up the last one in the drawer at the Boylston St. Boston store. I don’t know if there are more in the back, though. The cashier was impressed they even sold them.

    The guy working at the Mass Ave (near Huntington (where I stopped first)) knew what he was doing though, after looking things up, searching the drawers and going in the back, he gave me a list of addresses to go find it. Really helpful guy.

  • Jake says:

    Lansing MI – there is 1 at the clippert st store and 2 at Cedar st.

  • Xyroze says:

    These went on clearance a few weeks back. I was ready to buy them all up, but I just couldn’t for the life of me think of anything to use them for. Maybe I’ll just stash them in back until they are even cheaper and see how I feel then.

  • GeekDoc says:

    Grabbed two from each of my two local ‘Slacks. I have a friend who might want one or two. If not, into the parts box they go (no project yet).
    WHY can’t I resist cheap geekery!? I really don’t NEED these, they just looked too fun to pass up!

  • GCL says:

    And as it happens, there are more items going on clearance. The light sensor is already on clearance. But the RFID one is still at this local store. The clerk wasn’t surprised when I mentioned, nor was his backup. In fact the woman was quite surprised to realize that it, (the RFID one) was on clearance around the beginning of the past month. They are currently clueless as to why this is happening.

  • Jake says:

    @GCL

    This is actually pretty typical for radio shack, in my experience. I am assuming that they could have various reasons for cutting it (doesn’t sell enough/they are replacing it with something else/etc) but I have gotten CRAZY deals on random things at that store over the years, all clearanced for seemingly unknown reasons.

  • RevAaron says:

    @Nunya: Did you pick it up? I hadn’t seen this at first- I gotta get into Le Shack and snag it if you didn’t buy it! :D

  • Luke says:

    Well just found out about this yesterday and well I checked my local Radio Shack they were 36.99. Was this a few day sale?

  • Jake says:

    @Luke

    Oh, man! Either that’s a mistake, or radio shack saw all of the sudden sales and boosted the price back up!!! LOL!!!

  • Jake says:

    @Luke

    That must be a mistake. Just called a store near lansing, MI, they list the price as $9.97. Did you give them the stock number 2760032? Maybe they somehow entered the SKU for that other parallax thingy that is in the same drawer with the RFID reader?

  • Jake says:

    @Luke (Sorry for triple post)

    I just thought about it, did you actually have them scan it? Mine were still price tagged as $49.99, but they rang up as $9.97. The sales associate thought I was scamming them, and had to verify the price. Lol.

  • incognito says:

    got two at the local ft smith, ar store.. might as well use this one for the wireless door lock system featured on here about six months ago rfid door lock the right way

  • Luke says:

    @Jake

    I don’t mind the triple post. I had them scan it in and it did have 2760032 on the back. I might add I am in Alaska. I have no idea wither that would make a change or not. I will call my other Radio shack.

  • Luke says:

    @Jake (Or anyone)

    I just called my other Radio Shack and they have them for $36.97. Bummer I wanted to grab a few.

    Also is it RadioShack or Radio Shack?

  • Jake says:

    @Luke

    I thought radio shack’s pricing was the same at virtually all of their stores. Are they looking at the price tag on the things, or putting 2760032 in to their computers? Also, are you in the USA? I called about 6 stores in my area looking for these things, and they all had them in the computer for $9.97, but were price tagged anywhere from about $30 to 49.99.

    I am about done with a simple car door lock actuator using this and a small PIC. I don’t care what people say about these being limited in their uses, if I can get the entire thing in a working package for $10, and add a 2 dollar PIC and a few passives, I’m pretty happy!

  • boondaburrah says:

    Does anybody know where I could get standard card size tags for this reader that also have magnetic stripes?

  • Luke says:

    @Jake

    I live in Alaska. But as most things go we are not part of the ‘USA’ when it comes to shipping and some deals in stores. Hell we don’t even get the five dollar foot long. So I think that might be the issue. I did have them ring it up on the computer with the number and it came out to the $36.97.

    Thanks though for your help!

  • Jake says:

    @Luke

    NO FIVE DOLLAR FOOT LONG!?

    D:

  • Luke says:

    @Jake

    But we do have Sarah Palin! Wanna trade? I know I know low blow.

  • Jake says:

    @Luke

    Actually, I didn’t mind her. I’ll guarantee you that she wouldn’t have let ol’ McCain spend almost 4 trillion non-existent dollars in less than 2 years!!!

  • Luke says:

    @Jake

    I called about it and it turns out that in Alaska they are privately owned and are franchises. So the cooperate stores may have it for 10 but the owners of the ones up here did not want to take it that low.

  • Jake says:

    @Luke

    I wonder if you could get someone on here to ship you some? A USPS small flat rate box is only $4.95 to ship, and most large cities in my state have at least 3 or 4 stores, if not more. I don’t have any extra at this point, but if I get some, I’ll let you know. I am heading to Grand Rapids, MI this weekend and I am pretty sure there is a radio shack in each mall that I am going to.

  • Luke says:

    @Jake

    Thanks for the offer. But I think I will be OK.

  • Jake says:

    @Luke

    Roger that.

  • firestorm_v1 says:

    Thanks HaD!

    Went to the radioshack across the street and bought two.

  • Robert says:

    Have used it with my BS2. See the link http://www.parallax.com/RS and follow N&V #120 for BS1 or BS2 code.

    Will try next with the Propeller. I need to find something to lock, like the refrigerator, so my 2 teenage boys don’t eat me out of house and home at night. :)

    I got a couple of these to play with.
    Thanks bluewraith for the heads up.

  • Ken says:

    I stopped by my local radio shack the other day after seeing this article, and asked the guy if they had any of the RFID readers left in stock. He stared at me for a few seconds and then asked me “What is RFID?”. I didn’t know how to respond to that, and just told him to look up the clearance number that sparticle provided. Seems all the Chicago area stores are out of them :(

    How the hell can you be hired at an electronic parts store and not even have a clue what RFID is???

  • GCL says:

    @Ken
    It’s simple, you complete an application and they hire you. There’s a store near me, one in Forest Hills, the manager there reminds me of the typical Red Neck, each time I walk in to either browse or buy something even, he dares me to be insulting to him. (I can’t! He’s already been insulted by me.)

    Oh and don’t ask about the part, swing over to their cabinets and dive into the one called Sensors, it should be in there.

    @Luke, it might be the same here. Franchising is common for those stores. For RS, in a small town not even big enough for a mall, they might arrange for a small amount to be roosting in a general store.

  • Brian says:

    If anyone is in the Houston area, the Kemah TX store has three. The League City store (646 and 45), however, I cleaned out.

  • Ken says:

    Good new! I ignored the information the guy at the one Radio Shack gave me and visited another location today. Their system said they had 4 in stock (only found 2 in the drawer though) even though the company wide inventory system showed 0 for the local store as well as all others around it. Whatever, I’m happy I was able to find one!

    Plus, the associate I dealt with tonight was a much more useful human being and actually seemed to understand that not all their customers are stupid people looking for cell phone accessories.

  • blodgar says:

    several at the Latham Farms RS in Latham ,NY Rang up @ 9.97. “That’s the first one we’ve sold… didn’t know we carried parallax stuff!”
    ditto on the on-line survey. They are a pusillanimous parts store, but better than NO parts store…

  • JP says:

    I’m selling a few on ebay if our overseas friends want to take advantage of this bargain.

    http://cgi.ebay.com/Parallax-RFID-Reader-Module-/180519444127

  • MG says:

    bought four units at one of the ten or so RS stores in Columbus, OH. Called the nearest store first and they actually said over the phone that the price was $9.97. Each board also came with two tags, a round one and a rectangular card. Tested two of the units so far – they work fine with this Arduino code and wiring setup:
    http://www.arduino.cc/playground/Learning/PRFID

  • Dave Lee says:

    Anyone else having trouble with their unit sending only bytes containing FF?

    I’m thinking it’s just a mistake somewhere in my wiring, but all mine ever outputs is 0xFF, usually once when I wiggle any RFID tag by the antenna.

  • Matt says:

    I just found this post today, stopped by the Silverdale, WA RadioShack and found two of these readers for $8.47. I purchased both. The employees were clueless but I found the readers in the IC parts bin next to a Parallax sensor.

  • Timmy says:

    In case anyone sees this post via google, they are still out there. I visited two stores today, one didnt have any left but the other still had two. Might be worth a shot to look if you are near a radio shack.

  • Sean says:

    Just confirming that even now they are STILL OUT THERE, just picked one up from my RS for nine bucks and they still had about five left.

  • Michael says:

    I got the last two of these my local Radio Shack had in stock yesterday, $8.47 each.

  • qn4 says:

    December 2nd, 2010, cleaned out a local (Poughkeepsie, NY) ‘Shack of three of these. $8.47 apiece, still labeled as $49.98. If it weren’t for Hack a Day, I’d have never known. (Yay!)

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