english: They put a smartphone next to a keyboard, and they had people type, and then their goal was to use the vibrations that were created by typing to measure the change in the accelerometer reading to determine what the person had been typing.
non_english: Ze plaatsten een smartphone naast een toetsenbord en wanneer mensen typten,  probeerden ze de veroorzaakte vibraties te gebruiken om via de versnellingsmeter  te bepalen wat die persoon had getypt. om via de versnellingsmeter  te bepalen wat die persoon had getypt.