Find a technical co-founder, join some other accelerator, and develop the MVP. Not many investors will drop $500k into an idea.
Hardware is an order of magnitude (or nine, twelve) more difficult than a software startup. Expensive rev'ing, long turn arounds, supply chain mayhem, overseas production, profits thinner than the paper they are printed on.
The hardware graveyard of kickstarter is chock full of dreamy eyed hardware guys for good reason.