The day after creating a proof-of-concept of your custom IC, you might ask “Now what do we do?” It is time to make your idea real and start developing a system prototype. While the proof-of-concept activity answers the question, “Is it possible?” the prototype answers the question, “Can the system be built to specification?” This whitepaper covers developing the system prototype of an IoT edge device that contains a sensor, supporting electronics, and software running on an embedded processor.