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The Parking Helper

2010 Nathan Oostendorp @nateoostendorp

This is a simple utility device, replacing the traditional tennis ball on a
string for helping me park my biggish car in my smallish garage. Given
a voltage in from an ultrasonic rangefinder, it will show "Green" (keep going)
Yellow (get ready to stop) and Red (Stop) or All flash (Back up)
when it approaches/crosses a target distance set by the potentiometer.

The circuit:

- [Maxbotix EZ](http://maxbotix.com) analog out connected to GND, +5, and AN -> RANGEPIN
- Potentiometer connected to +5, THRESHPIN, GND
- Red LED connected to REDPIN -> 330ohm  resistor -> GND
- Yellow LED connected to YELLOWPIN -> 330ohm resistor -> GND
- Green LED connected to GREENPIN -> 330ohm resistor -> GND

Check the code out from Git, load into the Arduino, tweak.

I used a RBBB kit from ModernDevice, but any ol' arduino-compatable will work.