Keyboard pressing force measurement

Sensing how hard the keyboard is pressed

Measurement signal display

EMFi force sensitive sensors were attached below a keyboard and the force signals were recorded when the user performed an near-natural sequence of keyboard use tasks. The recorded signals from the top are force from a long EMFi strip under the whole keyboard, a small strip under the right side of the keyboard and a small strip under the left side of the keyboard. The x axis is time in seconds. The y axis is in arbitrary units as we did not try to calibrate this measurement.