How to make a speed meter to stop cars from speeding?
Here is born my idea: A speed meter that sits in my yard.
If it senses a car going faster then about 30 MPH, it will automatically set off a siren, scaring the crap out of people and making them slow down.
I don't want to hear about how this may/may not be illegal, I'll go to jail if its for the sake of saving our kids lives.
So I was thinking about how to do this.
An Arduino might work...but I would have to find some type of speed meter to use as a serial device for the Arduino, and after I did this, it'd be pretty easy. Just wire up a siren to a relay on one of the Arduino's outputs and away I go.
Anybody know where I could find a speed meter that will work with the Arduino?