Dileep Kurian, T. Karnik, Saksham Soni, Saransh Chhabra, Suhwan Kim, Jaykant Timbadiya, Ankit Gupta, K. Ravichandran, Mukesh Bhartiya, Angela Nicoara
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We present an end to end IoT system that works off harvested energy from multiple sources. It includes X86s compute, security and image inference at the edge. The mote is self-powered by an energy harvesting power management IC (EHPMIC). The system connects wirelessly to a gateway that connects to the cloud. Sustainable energy-neutral operation is achieved by solar and wind energy harvesting. 14000 lines of software stack was implemented, and the system was demonstrated to consume only 0.2mW idle and 24mW peak power. Measured minimum energy point was 6.2pJ/cycle at 0.5V /100MHz running Dhrystone benchmarks. EHPMIC delivers up to 120mW with a peak efficiency of 81.7% and only $120\mu \mathrm{W}$ control power overhead.
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