Fig. 4: Recognition of eight sliding directions of a finger on the BM-HMI.
From: Body-coupled minimalist human-machine interface for multifunctional touch detection
a The working principle and the corresponding generated electrical signals of the BM-HMI with eight sliding directions. b–i The output voltage V1 of E1, the output voltage V2 of E2, the ratio of maximum output voltage V2max of E2 and maximum output voltage V1max of E1 when the finger slides in the eight directions
