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Do I know how to make a wallet or bag? No, but I'm going to make one anyway. Do I intend to use a pattern or instructions of any kind? No, I'm just going to figure it out as I go along. This is what I consider the Synchronous Hackathon Challenges to be about; jumping in and making it up as you go along! This month, the weekend just gone, was the Money Bag Challenge.

I've had the idea to try my hand at making small bags recently, and have been examining the ones already in my possession for ideas on how to construct them, so this Challenge was the kick I needed to get started. But I just can't seem to do just one thing; so as well as making a wallet/bag for the first time, I've added RFID-shielding, and internal LEDs!

Step 1;
- prepare the materials, cut out rough sized pieces of fabric (I didn't measure anything throughout this entire project), and create the shielding (just tin foil backed with duct tape, like here).
- Then create the pockets, also lined with shielding. Basically a layer of shielding, with fabric sewn onto it. In three different heights, then all sewn down together onto fabric, like in proper wallets.
- This piece is then sewn onto more shielding and fabric.
- And another piece of fabric covered shielding is sewn on to make a sandwich or envelope.

Hmm... sandwich, bit peckish. Step 2; lunch!
Becky brought gingerbread velociraptors! I danced them around in front of the camera and ate up a few before thinking to take a photo! But they were just so yummy! Then Gary wipped up lunch for the whole space! Delicious pesto pasta, accompanied by a starter of toasted bread and garlic oil!

Okay, full now, back to work! (Well, truth be told there was leaving the space, going to the pub for a bit, watching season three of Torchwood, and a nights sleep, then back to work.) Oh, btw you can see Becky's beautiful wallet here!

Step 3; Verify the shielding. Enter prisoner and honta. Celebration time, because it actually works! At least at smartcard frequency (13.56MHz) which is what we tested. Then I got distracted by what they were doing with other RFID cards, sat around looking at some hex output, and have probably been convinced to get myself a reader.

*edit* There's me! I'm going to have to assume the text talks about testing the shielding. */edit*

Step 4; LEDs! After some to-and-fro I decided to run the LEDs down the centre strip of the bag that gives it depth. So, a simple circuit (redrawn a couple of times), with some Lilypad LEDs, a slide switch, and a coin-cell holder (some assembly required) large enough to hold rechargeable coin-cell batteries. In case the battery doesn't work out I want options, so I ended the circuit with metal snaps/poppers so I can swap out the battery whenever I want. Conductive thread in the sewing machine bobbin as usual, so it ends up on the underside.

Back the stip onto fashion fabric. Then underline two pieces of fashion fabric to be the outside of the wallet/bag. Stitch the shielded-wallet-pocket-section onto one of them. (Should probably do this to the underlining, before attaching to the fashion fabric.)

Step 5; Assemble. Right-sides together, sew along the edges. Add a loop of fabric to hold the battery-holder in place. Still inside out, sew a zipper in place. Then turn right side out, and there ya go, a wallet/bag/thingy!

Step 6; Power! Solder some wire and metal snap/poppers onto the battery-holder, and slip into place in the bag. Switch it on and hope for the best.

Step 7; Fill with stuff and admire. Oh, look inside the bag, pretty helpful LEDs! When adding stuff to the main compartment avoid metal, the conductive thread hasn't been insulated and you don't want a short. Just as well things like the Arduino Uno come in cardboard boxes :)

Well, it is the Money Bag Challenge, so check it out; money! And the RFID-shielded compartment. Yep, everything a maker/hacker needs on the way to a space. *curtain*

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