Swatchbook: Presence and Pressure Sensor

Title: Presence and Pressure Sensor

Credits: Admar Schoonen and Troy Nachtigall

Year of invention: 2015

Description: The well known resistive pressure sensor made with velostat, but now with a twist: the same sensor can also be used to measure presence using capacitive sensing. By combining both sensing methods, the same hardware can work both as distance sensor and pressure sensor. And when a small hardware change is added, it is also sensitive in only one direction (ignoring the human body on the other side).

Materials: Arduino, velostat or ESD foam, conductive textile, opamp

Dimensions: ~ 5 x 5 cm for the sensor, ~ 3 x 3 cm for the circuit (excluding Arduino)

Link: https://github.com/admarschoonen/resistive_cap_touch

Photo: coming soon (Troy has them)

Circuit diagram:

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wiring_with_shield

 

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