By using high-resistance conductive thread instead of conductive fabric, you can make a slider (potentiometer) with zippers. Unlike zipper switch, this sensor gives analog values instead of “ON/OFF”.
Resistive thread 66 Yarn 22+3ply 110 PET (4k ohm/20cm) is stitched on one side of the zipper using sewing machine. The thread is used as a top thread on the machine. To achieve the good connection to the zipper head, I had to go over the stitch many times with sewing machine.
The Lame Life Saver stitch is applied on the other side of the zipper. the end of the both stitches are connected to conductive fabric where you measure the resistance between.
As you move the zipper head, the distance from measuring point and the connection point on resistive thread stitch changes just like potentiometer sliders.
Related Work
Joo Youn Paek posted a really nice report of her construction of an analog zipper sensor using resistors sewn in series with multiple contacts back to the zipper:
>> http://itp.nyu.edu/physcomp/sensors/Reports/ZipperSensor
She used this technique in the Zipper Orchestra project:
>> http://itp.nyu.edu/~jyp243/jy/ziporch_2.htm
But analog is on and off. There is no inbetween. That is the definition of Analog.
Were you thinking of digital? =/
Sorry Taylor, but Digital is on and off. 1 and 0. Analog means that you can have a lot of values in between.
Thanks a lot for the tutorial! AWESOME IDEA! best!
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[...] through some of the suggested blogs and projects, I found someone using a zipper as a potentiometer. My idea is is to have a sweater with electroluminescent material which will react to the zipper. [...]
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