An IoT edge platform, where desired IoT nodes are realized combining several single-function printed circuit boards (PCBs) such as a sensor, microprocessor, and power supply unit with rubber connectors, is demonstrated. The PCBs are called “leaf PCBs” and their dimensions are typically 2 cm x 2 cm. Small rubber connectors are employed to connect these PCBs so that soldering is unnecessary and removable and replaceable structure is realized for customizability of IoT nodes. Three types of connectors, which utilize different conductive materials, are investigated under several kinds of reliability tests.
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