Since a few years on Facebook, I push for the creation in the Bay Area of a Motocross police patrol. I am trying to invent a device, or many, for a patroller to be able to communicate fast and easy, in a secure way, while he or she is riding his or her Motocross. A watch? A cell phone with no screen? A larger battery fixed on the Motocross? How can I publish on my Apple developper account drawings of what I mean?
About the only DIY-invented hardware we can attempt to help develop here, typically involve HomeKit.
Finding an online place to park drawings is up to you. We're prohibited from sharing inline images here in devForums.