Analog Fabric Joypad

20,190

56

36

About: My work combines conductive materials and craft techniques to develop new styles of building electronics that emphasize materiality and process. I create working prototypes to demonstrate the kinds of electr...

Intro: Analog Fabric Joypad

How to make an "analog" input device from fabric and a few other necessary materials.



"Analog" in parenthesis because, although it is made up of 4 analog inputs, the only analog transition between the directions (up, right, down and left) comes from the buffering material (in this case 3cm thick squishy packing material) that absorbs and spreads the pressure from the user's pushing, creating a gradual transition between the inputs.

This Fabric Joypad does not need to be used with the drawing application seen in the video, it basically supplies you with analog outputs that sense which direction (part of the circle) pressure is being applied to.

If you are interested, the drawing application etchAsketch was written in Processing and can be downloaded from the link in STEP 8.

All pictures can be seen on Flickr in my Analog Fabric Joypad Set

Step 1: Materials and Tools

MATERIALS you will need for the Joypad:

- Conductive thread - 117/17 2ply (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 (www.sedochemicals.com)
- 3 cm thick squishy packing material (or anything else you can think of)
- 5 metal snaps
- Stretchy fabric
- Regular thread


TOOLS you will need for the Joypad:

- Sewing needle
- Scissors
- Cutter (forgot this in picture)
- Ruler
- Compass
- Pen and paper or cardboard

Step 2: Pattern Making and Tracing

Using the compass, draw a circle with a 5.5cm radius on the paper or cardboard. Using scissors cut the circle out and mark the center. Divide the circle through the center into four equal sections. Give these sections about .5 cm space between themselves, 1.5 cm to the edge and 1cm to the center. Cut out these inner sections with the cutter.

Now trace this circle onto the neoprene three times:

1 x TOP: just the outline
1 x INPUTS: as it is (outline and sections). Remember to leave a little tag that is not included in the pattern!
1 x VCC: outline and inner circle line (see picture). Remember to leave a little tag that is not included in the pattern!

Now cut out these circles. Just the outlines (remember the tabs!) and nothing from the inside!

Step 3: Sewing Inputs and Vcc

Thread the needle with conductive thread and take the INPUTS piece of neoprene. Start to sew back and forth in cake-slice manner inside one of the sections. When the section is full, sew to the tab and attach a snap with the same piece of conductive thread.
With separate pieces of conductive thread do the same for all four sections. Make sure that the individual threads never touch each other.

Now take the VCC piece of neoprene and one long piece of conductive thread. Sew back and forth (see pattern in picture) with this to cover the space inside the inner circle. Using same piece of thread sew snap to tab.

Step 4: Cutting More Circles

Using the pattern circle, trance it's outline on the ex-static. Use scissors to cut out the circle a few millimeters smaller the outline.
Also trace the circle to the squishy packing material and cut this out using the cutter to get a straight edge.
Now all the individual layers are finished. Before continuing to create an edge and sewing everything together, we will want to test the inputs, to make sure there are no mistakes.

Step 5: Multimeter Test

To test the individual inputs, layer the circles as follows:

- TOP neoprene
- Squishy packing material
- VCC neoprene
- Ex-static
- INPUTS neoprene

now you can either use a multimeter and check the inputs individually by connecting each input to the VCC in tern and when applying pressure to the top of the connected input you should get a change in voltage of a few hundred Ohm (the harder you press the less resistance).

If you have a constant connection or no connection at all then you have a problem. Check all your connections and make sure the ex-static is in place.

If everything is working. Great!

Step 6: Making the Connection to Arduino

This step shows how to make the connection to the Arduino. If you don't intend to hook the Analog Fabric Joypad up to the Arduino, then you can skip this step. Otherwise I recommend making the connection before completing the Joypad, in case any problems occur.

MATERIALS you will need to make Arduino connection:

- 4 x 1K Ohm resistor
- Perfboard with copper line patterns (6x6 holes)
- Rainbow wire with 6 cables
- About 25 cm of cable
- Solder

- Ardunio Serial USB Board (www.arduino.cc)
- USB cable
- 5 crocodile connectors


TOOLS you will need to make Arduino connection:

- Soldering iron
- Third hand
- Pliers or some kind of wire cutter

Solder everything together as seen in the pictures and the schematic.
That was easy. Smile

Step 7: Completion, Sewing It All Together

To keep everything in place we need to cut a strip of stretch fabric that is as long as the circumference of the circle plus 1.5 cm seam allowance, and as wide as all the layers together (in my case 4.8cm) plus 1.5cm seam allowance. I'm writing this down, because it is possible to make the circle bigger and the buffering material thicker or thinner. You'll just have to do this calculation:

CIRCUMFERENCE = 2 * RADIUS * PI
RADIUS = 11 cm
PI = 3.14159
CIRCUMFERENCE = 34,6 cm

--> 36 x 6 cm for side strip

Start by sewing both of the shorter ends of the strip together. Then attach one edge to the INPUTS circle of neoprene and the other edge to the TOP circle of neoprene (as seen in photos).

Step 8: Hooking Up to the Drawing Application

If you want to try out your Joypad with the drawing application, as seen in the introduction to this Instructable. Then you will need to be using an Ardunio and have Processing (www.processing.org) installed on your computer.

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

Enjoy

Share

    Recommendations

    • Audio Contest 2018

      Audio Contest 2018
    • Electronics Tips & Tricks Challenge

      Electronics Tips & Tricks Challenge
    • Plastics Contest

      Plastics Contest

    36 Discussions

    0
    None
    champi91

    3 years ago on Introduction

    Hi, this is a great tutorial! I have also worked on your pressure sensor matrix. The link for the code appears to be broken, do you have these codes posted somewhere else? Thanks!

    0
    None
    ldubnitzky

    7 years ago on Introduction

    Absolutely amazing, original, and intuitive design.

    I was just wondering- is there any way something like this can be modified to have more sensor points and have smoother input (as in faster signal + not as much pressure needed)?

    0
    None
    colacarp

    7 years ago on Introduction

    Thank you very much with your extensive archive of tutorials! It has made things much easier for my own soft sensors!!!

    1 reply
    0
    None
    colacarpcolacarp

    Reply 7 years ago on Introduction

    here is what my collaborator and I did...

    http://www.youtube.com/watch?v=9kpU1UGxESc

    We created three single analog output (unlike the 4 that the joypad has) pressure sensors which we then hooked up to a lilypad arduino. We then sent the data into Max/MSP to generate MIDI values for Ableton.

    0
    None
    GenViper

    7 years ago on Introduction

    Ya know, I have to say, for someone involved in making soft circuits, you're pretty hard-core awesome :)

    Such a wonderful, professional look and quality you bring to both the hardware and software examples; enough to make this EE weep tears of joy!

    0
    None
    raiderxx

    10 years ago on Introduction

    I've been doing some research, because I am very interested in making one to use at a help center I word at, but I figured you would probably know more about it than me: How much do you think you spent on making this? You can assume I already have a soldering gun. Or is this something I would have to make in bulk to make it affordable? Thank you!

    4 replies
    0
    None
    Plusearaiderxx

    Reply 10 years ago on Introduction

    ... and about affordability... seeing as most of the materials you'll need come in larger quantities than needed for one pair, you can definitely make more for the same price. it's the hand-made production time that really makes them "expensive".

    0
    None
    colacarpPlusea

    Reply 7 years ago on Introduction

    I've been trying to find ways to cut down costs as some of these materials can get pretty pricy. I found some neoprene at a fabric warehouse near where I live, and I found some velostat bags for free- just ask places that deal with computer parts, you never know when someone want to throw some away.

    0
    None
    Plusearaiderxx

    Reply 10 years ago on Introduction

    seeing as i was still experimenting while making it, it took me almost a whole day to fabricate both slippers. and i imagine it might also take the good part of a day to follow the instructions. the one weak-point of the slippers is where the wire connects to the thread in the heel of the slippers. i really need to find a better solution for this connection, which was also the trickiest part in the making. maybe you will come up with some alternative solutions and can share the results? that would be great. i'd also love to see some pictures of the slippers you make. if you have any more questions, please ask.

    0
    None
    harborcity13jon01

    Reply 8 years ago on Introduction

    First thing I think of is the original arcade Street Fighter from the mid 80's. Instead of six buttons it had two large pads you punched/pushed. The harder, the more fierce the punch/kick. Soooooo I guess it could be used for disabled gamers/pc users, the very young or old, or ? You're only limited by your imagination.

    0
    None
    freerunnin1

    9 years ago on Introduction

    im guessing you like fabric tech seen as most of your instructables are made with fabric... :P