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Pressure buttons 1 Pin- notes

Credits: Pauline Vierne, Paul Seidler and Jussi Mikkonen
Year of Invention: 2016

Description:
This swatch is part of a work in process about Pressure sensing.
Facing the problem of having only a few Analog Pins available on some electronic boards (for example the Light Bluebean with Bluetooth connection facility (http://store.punchthrough.com/collections/all/products/bean) we thought about chained Analog switches.
Thanks to the principle of Voltage divider we can get distinguished Analog values from three different switches connected to the same Analog pin through a serie of resistors. For now the values behave more like several Digital values given from simple chained switches.
The intention would be to read Analog ranges from chained pressure sensors.

Materials:
Sewable resistors are made of tiny pieces of Eeonyx 20k.
Connection lines consist of Karl Grimm Copper yarn.
Connection points for crocodile clips are made of Shieldex P130 stretch conductive fabric.
Switches are two short lines of Karl Grimm thick copper silver plated yarn sewn on both side of a 3mm thick polyurethane black foam (for filters)

Techniques:
For now it´s made with sewing, machine and/or hand
Future development considered with knitting.

References/Inspirations:
Electronic Resistor Ladder: https://de.wikipedia.org/wiki/R2R-Netzwerk
Voltage Divider: https://en.wikipedia.org/wiki/Voltage_divider
http://www.kobakant.at/DIY/?p=6102

Dimensions: approx. A5 (21 x 14,8 cm)

Circuit Diagram:

schematics-swatch


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