Abstract
We have been proposing a gathering method for disaster area information by launching deployment of sensor node. The paper describes a mechanism controlling a cable length that unreels by launching of wired sensor node. The cable is wound on a reel that a powder brake and a rotary encoder are mounted on its rotation shaft. The cable length is measured by rotary encoder, and is adjusted by putting a break on the rotation shaft by the powder break. In the evaluation of the mechanism, we measured the length of cable connecting sensor node by free fall experiment. Then, an experiment confirmed that the proposed mechanism could control the length of a cable.
