You can do this organically + reaching target customers will be slow. You can do this by speaking to local college Marketing groups. Many engineering students attend these talks. Contact Marketing Deans at colleges to work out details.

A better way is to either use Facebook Ads or Traffic Oxygen (which allows creating audiences across many networks, including Facebook + many others).

Facebook Ads are very cheap.

If your budget can't support this, likely your project as many bigger problems.

You can also start a Kickstarter project.

You'll find out very quickly if people are interested, via Kickstarter comments + funding... or lack of funding...