sensors Article Earable TEMPO: A Novel, Hands-Free Input Device that Uses the Movement of the Tongue Measured with a Wearable Ear Sensor Kazuhiro Taniguchi 1,* ID , Hisashi Kondo 2, Mami Kurosawa 3 ID and Atsushi Nishikawa 4,5 ID 1 Graduate School of Information Sciences, Hiroshima City ...