The PicoCube is a 1cm 3 sensor node using harvested energy as its source of power. Operating at an average of only 6uW for a tirepressure application, the PicoCube represents a modular and integrated approach to the design of nodes for wireless sensor networks. It combines advanced ultra-low power circuit techniques with system-level power management. A simple packaging approach allows the modules comprising the node to fit into 1 cm 3 in a reliable fashion.