Coba jelasin Initialized systems dari Sénsor dalam bahasa sunda dong

These require starting from a known distance and accumulate incremental changes in méasurements.

Quadrature wheel- A disk-shaped optical mask is driven by a géar train. Two photocells detecting light passing through the mask can determine a partial revolution of the mask and the direction of that rotation.

whisker sensor- A type of touch sensor and proximity sensor.