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These slippers have 4 analog pressure sensors embedded. They can be used to feed Up, Down, Left and Right values into your computer replacing your mouse, joystick...

Visit the JoySlippers website >> http://www.joyslippers.plusea.at/

This Instructable improves upon the previous version https://www.instructables.com/id/Joy-Slippers/.
It will show you how to make a pair of Joy Slippers, connect them to an Arduino physical computing platform and run a Processing application that will allow you to draw with your feet, as seen in the following video.



The resistance range of the pressure sensors depends a lot on the initial pressure. Ideally you have above 2M ohm resistance between both contacts when the sensor is lying flat. But this can vary, depending on how the sensor is sewn and how big the overlap of the adjacent conductive surfaces are. This is why i choose to sew the contacts as diagonal stitches of conductive thread - to minimize the overlap of conductive surface. With the pressure sensors inside the JoySlippers, the initial pressure from simply wearing them, brings the resistance down to about 2K ohm and then when fully pressured by standing on the foot it goes down to about 200 ohm.

The next step (for me) is to find better applications for the Joy Slippers. The videos of the drawing application show that certain motions create certain patterns, meaning that they can be tracked.
I'm experimenting with some ideas for applications that make use of this and would appreciate any feedback, comments, ideas...

For more videos visit the YouTube Joy Slippers playlist

For more pictures visit the Flickr Joy Slipperes set
http://flickr.com/photos/64586501@N00/sets/72157603880355045/

Materials
The materials that you will need are simple, but it's probably not all stuff you have lying around your house. It comes cheap if you plan on using the materials for future projects, especially if you are interested in wearable technology or soft circuits.

So, how does it work?
The layering of conductive and ex-static in the slipper's soles creates very very simple variable resistors that are pressure sensitive. The layer of ex-static plastic between your conductive thread patches allows for more current to pass through, the harder you push the conductive layers together. I'm not 100% sure why it works, but it does, and it is amazingly stable. So by shifting your weight from left to right and tiptoe to heel you can generate pretty much every direction.

For up-to-date information visit the project website >>
http://www.plusea.at/projects.php?cat=1&work=14

Step 1: Materials and Tools

MATERIALS for the Joy Slippers:
- Conductive thread - 117/17 2ply (17USD from www.sparkfun.com)
- Ex-static - plastic from the black bags used to package sensitive electronic components
- 6 mm thick neoprene with jersey on both sides (ask at a local surf shop for leftovers, or if you live in Europe and plan to use neoprene for other things, get a sheet from www.sedochemicals.com)
- Stretchy fabric (you can also use a pair of old socks if you don't feel like sewing so much)
- Regular thread
- Perfboard with copper line pattern (7x3 holes 6.25USD from www.allelectronics.com)
- 50ft Spiral telephone wire (1.99USD at 99cent store)

MATERIALS to make Arduino connection:
- 4 x 10K Ohm resistor
- Perfboard with copper line pattern (6x6 holes)
- 15cm of rainbow wire with 6 cables
- 2 telephone jack outlets (5 for 1.50USD at 99cent store)
- Tupperware box or similar
- Solder
- Superglue

- Arduino USB Board (35USD from www.sparkfun.com)
- USB cable (4USD from www.sparkfun.com)
- Laptop or computer (hopefully you have one, or can borrow one)
- Processing installed on your computer (download free from www.processing.org)
- Arduino software installed on your computer (download free from www.arduino.cc)

TOOLS you will need:
- Sewing needle
- Scissors
- Cutter
- Ruler
- Pen and paper or cardboard
- Your feet

- Multimeter for checking your work
- Soldering iron
- Third hand
- Pliers or some kind of wire cutter
(- Bread-board)

SKILLS required:
You will need to be able to solder. Soldering is not hard and there is a nice Instructable right here: https://www.instructables.com/id/How-to-solder/

You will need to know how to use the Arduino software environment, in order to upload following code to your microcontroller. It will read the first 4 analog inputs and receive them via USB.
www.plusea.at/downloads/_080201_Read_4AnalogIN.zip

Following Processing application will read the incoming values from the Arduino's inputs and use the information to draw a line.
Input will be read as follows:
Analog INPUT [0] = Right foot TOES
Analog INPUT [1] = Right foot HEEL
Analog INPUT [2] = Left foot TOES
Analog INPUT [3] = Left foot HEEL
_080209_JoySlippers_etchAsketch.zip www.plusea.at/downloads/ _080209_JoySlippers_etchAsketch.zip

Step 2: Pattern Making and Tracing

Making a stencil
Because everybody's feet are different you are going to have to decide who to make these Joy Slippers for.
This Instructable will only go through the steps of creating the right slipper. The left slipper is exactly the same, except you will have to turn the stencils upsidedown.

Trace your right foot onto a piece of thin cardboard or thick paper. Before cutting out the tracing draw a tongue-shaped tab that sticks out from the heel about 5cm (see pictures). We will call this the tongue and it will be where we attach the slippers to the electronics later on.
Now cut out the tracing with the tabs. Put your foot back on the tracing and find the areas where:
1) your heel presses
2) the balm of your toes press
In these areas you will want to draw a strips of 1.5cm wide and at the toes: 6cm long and at the heel: 4cm long. Make sure these strips do not come within at least 1cm of the edge. Cut out the insides of these strips and make markings every 1cm along the lengths. In the next step these strips will make sense.

Tracing onto neoprene
Trace these stencils on to the neoprene twice for one foot. And mark everything as shown in pictures.

Tracing onto ex-static
You do not need to make a separate stencil for the ex-static, unless you plan on making more than one pair of slippers.
Trace the foot stencil onto the ex-static and cut it out about 5mm smaller all-round. Do not include the tongue.

Tracing onto stretch material
Unless your foot is exactly the same size as mine (European 39) then you will have to alter the pattern as seen in picture. You can also sew on a pair of socks and save yourself some time.

Step 3: Sewing Inputs and Vcc

Vcc:
Thread a needle with enough conductive thread. Take one of the pieces of neoprene, this is going to be the Vcc, the power supply for the sensor where the 5V from the Arduino will run to. Tie a knot in the end of the thread; do not take the thread double. From the back (in my case black side) poke the needle through the neoprene at one of the end dots of the toe strip marked from the stencil. Stitch back and forth in a diagonal zigzag manor until you reach the other end of the strip. From here go bring the conductive thread back to the back side of the neoprene and make small stitches on the back towards the tongue. When you reach the tongue you can stop sewing and without cutting the thread remove the needle and continue with the following.

Inputs: Toes and Heel
Take the other piece of neoprene. Essentially you will do the same here with one exception: You will sew the zigzag pattern opposite to the way you sewed the Vcc strips! This way, when you lay the pieces of neoprene on top of each other, conductive thread zigzags facing inwards, they will crisscross each other and make for a good connection. Take a good look at the pictures.

Test
Before going onto the next step, now would be a good time to check your connections using a multimeter. Measuring from the loose ends of conductive thread, check for a connection between any of the three ends. There should be NO connections. If there are, then you probably accidentally crossed conductive threads somewhere along the way. You can quite easily pull out the conductive thread and start over again.

Step 4: Finishing Slipper


Sewing sole of slipper
Now you will want to layer you pieces as follows so that the conductive traces are facing inwards:
TOP
- Vcc or Inputs
- Ex-static
- Inputs or Vcc
BOTTOM

Hold everything in place and stitch around the edges of the neoprene. Sewing both layers of neoprene together, not including the ex-static in your stitches. Take a good look at the pictures to see how to best to stitch. Do not sew the tongues together (yet), instead stitch back and forth at the foot of the tongue, giving it a bit of a dent and making it easier to bend later on.

Another multimeter test
You can now make another multimeter test to make sure none of your inputs and/or Vcc are touching each other. You should have some resistance between the inputs and the Vcc. And this resistance should become less when you apply pressure to the top of the layers. What you don't want is a permanent connection. Or no connection at all between an input and Vcc. Or any kind of connection between the inputs.

Decide left or right
NOW you really decide if this is going to be the sole of a left or a right slipper.
Take a cutter and cut just a very very small slit into one of the tongues. The tongue you cut the hole in will make it the outside layer of neoprene, the one the touches the ground, not your foot.

Cutting cord
Take the 50ft spiral telephone cord and cut it in half. We will use one half for each slipper. So we only need one at the moment. From the cut end, strip away about 2cm of the thick insulation

Soldering
To bring the conductive thread and wire together we need to solder three of the four wires to a small piece of perfboard. 4x7 holes with 7 strips of conductive copper pattern. I double-spaced the wires to make double sure I don't get any connections between the conductive threads. Please see illustration image for how to solder and sew. Also see the illustration for which three of four wires you should pick to solder.

Sewing up
Now that the conductive threads are connected to the wires of the telephone cord you can stitch around the tongue, enclosing it all between the two layers of neoprene.

Attaching jersey
If you choose to use a sock instead of design your own slipper then now you will be attaching the neoprene sole to your sock. Instead of socks, you can also attach straps of fabric, anything that will hold the sole firmly to the bottom of your feet. If you don't want to sew at all, you can try wearing the soles inside some socks or even shoes!

To follow the pattern shown in the pictures, take the pieces of stretch material and sew them right-sides-together to the edges of the sole (upsidedown). Follow the images to get an idea of how to sew the pattern together. Attach the tongue to the heel so that is sticks up and stays in place.

Step 5: Making Connection to Arduino

This step shows how to make the connection to the Arduino. For this you will need an Arduino, which is a physical computing platform that has a USB connection to your laptop, contains a microcontroller that we can program to read the variable resistance of the Joy Slippers from its analog inputs.

Of course, if you know what you are doing, you can hook the slippers up to any other circuit or device you have for making use of their variable resistance. So if you don't intend to hook the Joy Slippers up to the Arduino, then you can skip this step.

The connection from the slipper consists of:
- Two male telephone jacks coming from the slippers
- Two female telephone jacks that will be attached to the Tupperware box
- Inside the Tupperware box the Arduino inputs will connect to the back side of the female telephone plug socket and there will be a small circuit that puts a 10K Ohm resistor between each input and the ground.

Dismantle
We need two female telephone jacks. You can dismantle a telephone jack adapter for this. You might want to clip the wires sticking out at the back to about 5mm length so that they don't come so close to each other.

Cut holes
You need to cut three holes in the Tupperware box. Two for the female telephone jacks and one for the USB Arduino cable. Use a cutter or a drill and be careful.

Solder
1) Follow semantic and solder rainbow wire from headers to perfboard with resistors, to more rainbow wire.
2) Poke the ends of the telephone wire out through the hole of the box and solder them to the female telephone jacks according to the semantic.

Superglue
Once the female jacks have been soldered you can superglue the jacks to the box to make them sturdy and relieve all strain from the wires.

Decorate
Now the box is finished and you should decorate it if you can.

Step 6: Hooking Up to Your Computer and Running the Drawing Application

Make sure everything is soldered together correctly and all the plugs are in place.

For Arduino microcontroller code and Processing visualization code please look here >> http://www.kobakant.at/DIY/?cat=347

Thresholding
Because each slipper is individual and depending on all the exact materials that you use and the way you sew them together, the range of variable resistance will be different for each sensor (right toe, right heel, left toe, left heel). This is why there is a threshold function in the processing applet, that allows you to set the MIN and MAX values of your sensor. These will be between 0 and 1023.

MIN threshold should be slightly above resting state and MAX threshold should be maximum value obtained when pushing as hard as possible on the Joy Slippers.

Future
I'm currently developing different applications and games for the Joy Slippers.
For up-to-date information visit the project website: http://www.plusea.at/projects.php?cat=1&work=14

Although this is the second version, I'm still thinking about improving and would appreciate any feedback you can give me after having read though this Instructable.

Thanks and enjoy
<p>Finds someone who can tap dance and you have art I would buy!</p>
<p>I just wondered if you could collaborate with a software game writer and create a game where the players use the slippers to move around the game. This could be done as multiplayer at home or via collaborative gaming among Internet players(?)</p>
<p>as a disabled vet I would also suggest that this could open a new world for those that have lost limbs. Used for art, communication etc.</p>
These are so fun! They look really cool too, I like the curly cables look.<br><br>I'm sure you've thought of it already, but I think this would be a fun controller for MIDI music or rhythm sounds. You could rig a kick drum and hi-hat to simulate a real drum kit's pedals, or just have some crazy sounds created based on the velocity and attack. I'm sure there's someone out here who can create a program to take your data and turn it into MIDI. You may also be able to trigger parts of a loop, so that the faster you step, the faster the loop plays!<br><br>You could stomp your feet to make the beat!<br>-Olaf
you should make a glove that does the same thing, for example your palm works at moving the mouse, while your index and middle finger acts as the right and left buttons <br>
At least you made me laugh. Very Funny.
Very creative. Keep inventing you make really cool stuff.
I JUST GOT THE BEST IDEA! Dance Dance Revolution-slippers! (Only thing needed is to learn to step the front and the back buttons in the game with the specified feet.)<br><br>Think of all the cool moves you would be able to make when the only needed thing is to step on the right part of the right foot when the arrows come in the game.
This is a lovely idea. I'm just starting out, but I would love to get to where I can make something that gives feedback (noise, vibration, etc) for a friend's son who is blind and profoundly autistic. He would be thrilled with slippers that let him jump around and &quot;mix&quot; his favourite house music or something. Music is one of his favourite things. Thanks for the inspiration!
Hi there,<br><br>the links to the code are invalid... do you think you could re post them? thank you.
I'm completely immersed in cyberspace.<br>I'm there.<br>
I would like to use some parts of this project to detect the shape of the foot - the movements are not as important for what I have in mind. Do you think that that is possible?<br /> <br /> I'm a professional athlete and I'm trying to collect information about the impact that my shoes have on my performance (later I'll deal with movements too).<br /> <br /> My programming skills are pretty strong but I can't claim the same when it comes to electrons and circuits. Therefore I'm trying to learn the minimal that I need to build the proto so I can cross and validate the data that the hardware you have put together will collect.<br /> <br /> btw - you're awesome, I love your tutorials!<br />
hi. yes, i think these pressure sensors would work to detect the shape of the foot in a kind of pressure/height map. the only issue will be to fine a good range, where the pressure inside the shoe matches that sensitivity of the sensors. meaning you can detect difference between the hardest and softest pressure and everything in between. i reccomend also replacing the velostat with some stretchy piezo-resistive fabric from eeonyx. try contacting them and asking for samples of their EeonTex RL-5-137 SL-PA fabric or if you can purchase a small amount at a good price&nbsp;&gt;&gt; www.eeonyx.com<br /> and then you'll have to play with number of layers of eeonyx fabric and size of conductive stitches to get a good sensitivity/resolution. good luck! and i'd love to see what your results look like:-)<br /> <br />
&nbsp;you're awesome as usual! Great tips and yes I'll definitely ping back when I have something to share. Thx again Plusea!
Never seen this before looks very interesting. Are there any problems that I need to worry about because this ible is really creative and awesome.
These are great. I tried to get the zip files of the arduino & processing programs but I get this message: "Sehr geehrter Besucher, leider ist ein Fehler aufgetreten: Die gewünschte Seite wurde nicht gefunden. Haben Sie sich vielleicht vertippt oder eine alte URL aufgerufen? Wenn nicht, informieren Sie bitte den Webmaster dieser Homepage per Email. Um zu der vorherigen Seite zurückzukehren, verwenden Sie bitte einfach die "Zurück" - Taste Ihres Browsers. " I'm guessing it means it can't be found...
OH NO. this happens to me everytime i try to clean up my folders. i've updated the links in the Instructable as well as some of the instructions in the text. hope everything works now:-)
great, thanks!
A simple game would be a version of Simon. That memory game with the lights and tones you have to match. Or maybe a 3d first person version of Frogger where you have to get thru traffic without getting clobbered. My cynical side can see some gaming company picking up on it and developing a game called "Go For A Walk". Where you fire up the gaming console and 'go for a walk', rather than actually... going for a walk! A sad game that just turns us into even more of Fahrenheit 451esque shut-ins. "EA Games brings you Go For A Walk. Because the world is a dangerous place with boogie men, pedophiles and rapists around every corner. Don't Get Dead, Go For A Walk!" The slippers also have music potential. With the four sensors, played singly or in combination, you get a fairly wide range of notes. I don't know how many because I suck at math and I have no desire to not suck at math. I'm sure some math lovers on the site can figure it out. Or you can use the pressure sensitive properties to bend pitch and adjust volume. Making a "foot theremin" (yes I know its not a true theremin because it uses physical contact). Yeah, using it to help disabled people would be nice. And its practical and noble. But I like the artsy fartsy potential. We need more toys and fun and creativity and the pursuit of the totally ridiculous. When I do something and people say I'm a geek/dork/goofy and they get embarassed to be around me, that usually means I'm on the right track. Changing the world one spectacularly ridiculous step at a time. (Thats a good slogan for your slippers!)
hi benwa, thanks for the nice detailed comment and ideas. you're right it is a sticky situation not to get caught up re-creating the real. i don't like the idea of a virtual walk, unless it offers something that doesn't exist in real life. so what i'm interested in now is creating a new kind of spacial perception by giving feedback to the wearer and letting them explore. for this i plan on using a wireless version of the slippers, escaping visual feedback. and i'm hoping that as soon as i get started, it will lead to even more interesting experimental places.
I didn't get to read/view all of the steps of this since I'm on a slow connection. Please don't think me lazy by asking instead of reading: Have you looked into having these slippers made available to people who don't have arms/hands, or at least don't have the use of their arms/hands. For that matter, you could apply for a US Government grant to continue your development if you could make your system(s) available to the handicapped/paralyzed. IMHO, Artsy-fartsy expressionism is great, but humanitarian use is better!
You're right, developing systems for the handicapped is an great and interesting field to work in.
Wonderful Job! I really feel like your Instructable, and other technologies based on it, could have a major effect on society. I wrote you up on my blog, <a rel="nofollow" href="http://joofalltrades.blogspot.com/">Jo-Of-All-Trades</a><br/>
Thanks for posting, I like what you wrote!
Great Work! This would be a great application for unintrusive Wireless Health Monitoring also!
Very cool instructable. Another fun project might be to put small speakers on the shoes and make them make a different sound for each part of the foot you step on. It would get pretty annoying eventually, but might be fun for a start.
I've been thinking a lot about non-visual feedback, escaping projections and screens... Embedding some tiny force feedback motors will be a next step. And maybe they tickle, that would be great.
Wow. Thats really really cool. I'm going to have to look into this....I wonder what other applications this could be used for.....
~~Yummy~~ Awesome job! They look ~~delicious~~ really nicely done, great job. Very good details, good use of links, everything is just great. +1 rating.

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