PDA SD expansion

secure digital wifi expansion

Okay, if yesterday’s hack didn’t turn your stomach, this one will. It was inspired by this previous feature hack. After splitting open the PDA and a secure digital wifi card you solder the two together. When you are done you should have a PDA with built in wifi and an open SD card slot. I guess it works, but how is it that simple?

[thanks Dave]

Comments

  1. Tim pope says:

    sadly this does NOT allow you to have a free sd slot for other cards, at the end he says you need to stick a card in the slot this is due to a switch that is activated when a card is inserted so the wifi wont work till there is something in the slot…its a nice idea but i would rather keep my sd wifi card as is so i can use it in any pda

  2. retep vosnul says:

    Is the WIFI component on the same bus as the optional extra sd card ?

    And wouldn’t it be simple to sabotage the switch that activates the bus when something is inserted ?

    Did he stick it over the battery compartment ? Isn’t this going to cause broken wires every so often ?

    Too bad the picture and text didn’t have finer detail.
    But it’s a nice hack anyday !.

  3. brk says:

    Sorry, but the “instructions” on that page are so painful to read, there is no way I would go about tearing into my PDA based only on his wonderful writeup.

  4. phantaszm says:

    Do SD slots/connectors work this way? Is it technically possible to just solder more wires to the SD slot’s connector to add more features (ie second SD storage or bluetooth or wifi)

  5. bob smith says:

    i love all the hacks posted here with EXTREMELY bad directions, very low-quality images, and/or written by 8th graders.

  6. ladyada says:

    ok, while this hack does win points for gruesomeness, it really doenst work and people who want to functionally extend their PDAs should NOT perform this hack.
    SD/MMC card slots are not ‘bussed’, they can’t be split into two slots. There is only one Chip Select line, end of story. The most likely outcome of trying to use two cards at once, here, is that they will both clobber each others’ signals when its time to send data on the same line.
    But on the off chance that you just want to make this work (like if you want a large SD wifi card without it sticking up above the device) almost all SD/MMC slot have a metallic switch that opens/closes and you either need to short it (electrically) or cut it permanently open. Probably one of the side mounting tabs.

  7. ladyada says:

    Actually, scratch that…I changed my mind.
    If the cards are working in pure SD/MMC mode they should be fine. Pure SD and MMC protocols allow for multiple cards, whereas in SPI compatibility mode only one is allowed. (Chances are a PDA doesnt use SPI compatibility mode.)
    Whether the host will intelligently support multiple cards is a different story, but yeah, just cut open or short the card detect switch and this hack should work just fine.

  8. jared harley says:

    There are actually hi-res [but slightly blurry] images – just drop off the “Pro1.htm” in the URL – http://homepage.ntlworld.com/david.hutchinson27/pockpc/

  9. Ben Dalton says:

    Don’t min-sd and standard sd use the same pinout? I wonder if you could use a minisd wifi card, and manage to fit it under the plastic cover. If you could futz with the switch. This could lead to ‘integrated’ wifi for many a low end pda… I know I would definitely buy one of those if I could get that up and going.

  10. eccramer says:

    Well, ther is possibilities for this (although that how-to was atrtocious, and I feel sorry for that poor iPaq). If you could rig up a second slot, and a switch, you could have both cards in the device, and could switch between them when needed without having to carry another card in, say, a pocket. That would lessen the possibilty of loosing cards, and would provide a slight bit more convenient.

    -E-

  11. memodude says:

    don’t most ppcs include a blanker card anyway? i know my axim did…anyway, if you used that you wouldn’t have to short out the card sensor.

  12. @1

    I think you misread the end? Either that or i did; “ye will need to use the rest of the cards plastic cover to stick in the slot or have another card in whats the point of doin this hack if ya not goin to use another card? if anyone knows how to make it work without having another sd card in mail me.”

    This to me reads… If your not using another card – say a 1gig sd card (Which is why you would want to do this hack, so you could have memory and wifi), then you need to put the plastic in so it activates it. If you have a memory card in it, you don’t need anything else and thus has both wifi and that extra card…

    Atleast thats how i read the broken english?

  13. now that i reread the hackaday post… I see where people are getting confused… eliot said “wifi and an open SD card slot”… but the artical never said this…

  14. blaine says:

    Wow. Just wow. I’ll never understand how people don’t even make an effort at clear communication.

    Spelling errors and grammar malfunctions are just minor problems. The fact that we have to debate what the actual result of the ‘hack’ is – is a major problem (whether it’s a multi-card slot or you need another card just to short it out…).

    That said, ladyada has mad chops so she should know.

    Maybe just pick up two SD/MMC connectors, solder them up to a junk card (or possibly a dummy) and pop it in.

    I genuinely hope it’d work. I purchased a cheaper PDA without built in wi-fi.

    At the very least, I could make a piggyback with my 1GB card and a wifi card.

  15. jimmys says:

    Ladyada, how about putting in a physical switch for CS between the SD slot and the wifi?
    Wouldn’t that allow use of either on demand (but not both at same time)?

  16. ser says:

    That is a very interesting hack, but my brain hurts from trying to read such poorly written instructions. And the end result is simply just tacky looking. If I get some free time maybe I will try the hack and come up with a better solution

  17. Jake says:

    this is a cool hack,
    Jake

  18. I don’t think I’d call a big circuit board hanging off the back of my PDA built in but that’s just my thoughts…

  19. greg says:

    Could someone show this person how to use the period key and the shift key?

    From the pictures, it looks like an interesting hack but my brain hurts from trying to read it.

  20. Suntiger says:

    LadyAda: So, you’re saying that, theoretically if I were to solder the SD slot from my busted m505 onto the SD slot pins in my Tungsten T3, that I would probably be able to use 2 storage cards at once without them garbling each other? I happen to know from emulation that frankengarnet 5.2 does support multiple SD slots natively, but will the palm detect and switch them both OK?

  21. Suntiger says:

    Update to my last post: I can confirm that Palm OS does not support SPI, at least not as of the LifeDrive. So that means this will work for 2 cards or more, right?

  22. Suntiger says:

    Update update: Palm is not very helpful on this point – sometimes they say they don’t support spi and sometimes they do. Guess I’ll have to try it..

  23. Magicmage says:

    i have changed the how to go to http://homepage.ntlworld.com/david.hutchinson27/pockpc/Pro.htm instead might be easier

  24. Magicmage says:

    i you check my last post and click on the link u will notice that i have not tested with two cards (yet) if someone does before me please let me know how it goes THANKS

    i must admit it is abit of a mess but it is me first hack

  25. Suntiger says:

    Magicmage: Is there a Stop & Shop near you? They sell 32 meg SD cards for $15 in the camera film section. Get one and try it for us?

  26. Alessandro says:

    Has anymore attempted to see if it works with two cards are the same time, (WiFi plus a storage card) I have a budget Pocket PC and this hack is very interesting to me indeed. I just want confirmation from someone that it WILL work as described before I go tearing up my Pocket PC.

  27. [sVen] says:

    Could one say gut a sdcard and solder a ribbon cable inside it then extend the cable out side the case then mount two or more sdcard slots. So I could copy from one sdcard to another?
    [sVen]

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Follow

Get every new post delivered to your Inbox.

Join 96,449 other followers