Basically, the textile pressure pad is using common fabrics which is non-conductive to sense the pressure and output analogy data. The idea is referred to the method called ‘Polymerization of pyrrole’1, which is allowing conductive polymers to form in and around textiles, coating their individual fibers. Before making this prototype, I did a set of comparative experiments which demonstrate that sponge works well for sensing pressure. Being soaked in a water-soluble graphite conductive solution, the interstices of the sponge are filled with graphite particles. It makes the sponge conductive, at the same time the deformation makes the sponge can work as Velostat to output analog data. Then a conductive copper tape is attached to the non-conductive leather material. Finally, all the components are stacked together in the shape of a sandwich to form a textile pressure sensor.
Parts & Materials list
Materials list(Figure 2.1):
Water-soluble conductive graphite pigment
Non-conductive leather cloth
Arduino Nano 33 IOT
‘PolySense: Augmenting Textiles with Electrical Functionality using In-Situ Polymerization,’ Cedric Honnet, Hannah Perner-Wilson, Marc Teyssier, Bruno Fruchard, Jürgen Steimle, Ana C. Baptista, Paul
Strohmeier,’https://dl.acm.org/doi/pdf/10.1145/3313831.3376841′Soft and stretchy fabric-based sensors for wearable robots, Lindsay Brownell, ‘https://wyss.harvard.edu/news/soft-and-stretchy-fabric-based-sensors-for-wearable-robots/’