Development of a Distributed Stretchable 3-axis Sensing System

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In FY2022, we improved the performance of a stretchable 3-axis skin sensor by replacing the silver pastes and meander patterns used in the previous version with coiled copper wires.Our findings showed that this modification resulted in a significant increase in the maximum stretching ratio of the sensor from 150% to 250%. Furthermore, the resistance of the wires did not change significantly even after several hundred stretching cycles, allowing for stable I2C digital communication. However, we also observed that the coiled copper wires were prone to breakage after around 200 stretching cycles. Based on these findings, we identified the need to focus on improving the robustness of the sensor, which remains a significant challenge.These results were presented at the SI2022 Conference.