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Step 4Cutting Ex-static and Sewing Together
Trace the foot stencil onto the ex-static and cut it out about 5mm smaller all-round. You do not need to include the tabs.
Now you will want to layer you pieces as follows so that the snaps are facing upwards:
TOP
- Vcc or Input
- Ex-static
- Input of Vcc
BOTTOM
Now hold everything in place and stitch around the edges of the neoprene. Sewing both layers of neoprene together, better not to include the ex-static in your stitches. Take a good look at the pictures to see how to best stitch it together.
HOW IS THIS GOING TO WORK???
The layers that you have just sewn together create two 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.
You can now make another multimeter test to make sure none of your Inputs and/or Vcc are touching each other. You should 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. Or any kind of connection between the Inputs.
Now you will want to layer you pieces as follows so that the snaps are facing upwards:
TOP
- Vcc or Input
- Ex-static
- Input of Vcc
BOTTOM
Now hold everything in place and stitch around the edges of the neoprene. Sewing both layers of neoprene together, better not to include the ex-static in your stitches. Take a good look at the pictures to see how to best stitch it together.
HOW IS THIS GOING TO WORK???
The layers that you have just sewn together create two 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.
You can now make another multimeter test to make sure none of your Inputs and/or Vcc are touching each other. You should 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. Or any kind of connection between the Inputs.
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