Taeil Kim1,Woo Soo Kim1
Simon Fraser University1
Pressure sensors are one of essential features in wearable devices and may be utilized for early diagnosis of deseases or monitoring symptoms. The basic design requirements of the insole with pressure sensors are lightweight and flexibility. A 3D integrated origami structure printed with a flexible material is suitable for these requirements. For the acquisition of pressure data in motion, a conventional inter-connection to the pressure sensors makes the design and structure complicated, vulnerable to strain, and cumbersome as a wearable device. So, a wireless communication can be an alternative beneficial method to fabricate a simple and convenient wearable device.<br/>We present here a 3D printed wearable insole with LC (an inductor and a capacitor)-based wireless pressure sensors. Specially the capacitor part of LC sensors is designed with Miura origami which detect the pressure by changing the gap between two conducive faces of origami structure. These capacitors are connected with spiral inductors at the bottom of insole. These LC sensors are wireless resonators and have identifiable resonant frequencies depending on the differing capacitances when the insole is pressed. The simulation results of the change of resonant frequencies is compared with the measurement results. This 3D printed origami-based insole with wireless pressure sensing system can be further developed to equip different sensing capabilities for a comprehensive feet health monitoring system.