Basically you just have to get the conductive surface and Velostat ratio right. I find the following methods work best. As little conductive thread as necessary to cover the sensitive surface. For up to a two cm wide strip, it can be enough to have a single thread running down the center of the strip and three layers of Velostat in between each thread.
Stick a stickytape bend sensor to your wrist with some extra stickytape!
Make your stickytape bend sensor and hook it up to your computer in less than 4 minutes!
This video shows the full process of making a stickytape bend sensor and hooking it up to your computer in less than 5 minutes.
This video shows the graph of a super slim stickytape bend sensor inside a regular drinking straw.
Step 1: Materials and Tools
When shipping to north America, I like to order from LessEMF because they stock all three essential items, are quick to ship and the prices are reasonable.
Velostat is the brand name for an anti-static plastic manufactured by 3M. The plastic bags in which sensitive electronic components are packaged are made of this material. It also runs under the names: anti-static, ex-static, carbon based plastic, ESD, Linqstat (made in china), Lagerbeutel (German for storage bags)&
So you can also cut up one of those black plastic component bags if you have one at hand. But caution! Not all of them work!
- Any kind of stickytape will work, but it can be nice to use a duct (gaffer) tape for its flexibility and robustness. You will find a wide selection of tapes at your local hardware, office supply store and stationary stores.
- Velostat by 3M from http://www.lessemf.com/plastic.html
- Conductive thread from http://www.lessemf.com/fabric.html
- Conductive fabric from http://www.lessemf.com/fabric.html
- Random objects to handle stickytape
Step 2: Tape
If you like you can download these stencils for guidance. But i really think this Instructable is more fun with less precision and more free-form.
Simple Pressure Sensor >> http://kobakant.at/downloads/stencils/SImplePS.pdf
Simple Bend Sensor >> http://kobakant.at/downloads/stencils/SImpleBS.pdf
NOTE: As in all steps, take a close look at the pictures to better understand my description. Plus, always think about different ways to do things. Maybe you can make these sensors even simpler or possibly improve their performance!
Step 3: Thread
Apply to both sides.
Step 4: Fabric
Apply to both sides.
Step 5: Velostat
Now you are finished. And can test it with a multimeter. Or see the last step in my Fabric Bend Sensor Instructable for information on how to hook your sensor up to your computer >> https://www.instructables.com/id/Fabric_bend_sensor/