This sketch and suggested hardware ties together a cheap
TM1638 based display and an off the shelf ultrasonic sensor
to create a device that tells you how much further you need
to go to be parked.
It's definitely a toy - something that would have traditionally
been accomplished by "winging it" when parking, or using a string
and a ping pong ball affixed to the ceiling. But when some of the
electronic parts are so cheap these days, why not have a little
bit of fun with it?
For more information, see my website for the full writeup:
See the supplied Fritzing file for the very simple schematics.
This project would not be possible without the following two
Arduino libraries. Thanks to the authors who made their work