US Patent 9999827 Self-balancing skateboard with strain-based controls and suspensions

A self-balancing electric vehicle may include a platform having first and second foot placement sections rigidly coupled to each other, and a pair of coaxial, motorized wheels independently mounted between the first and second foot placement sections. The first and second wheels may be coupled to the platform via spring suspensions. Rider presence and turning intentions may be determined based on strain induced in the platform by the rider. The strain may be detected by one or more strain gauge systems. One of the strain gauge systems may be configured for use in a steering control circuit, and may include a strain gauge sensor mounted diagonally with respect to a long axis of the platform, such that the strain gauge detects only twist-induced strain.