Simple parking sensor using an Arduino and a Parallax Ping))) sensor. 100K linear potentiometer is used to set the distance at which the light turns from green to red. It ranges from 12 to 72 inches.

Ping))) Sensor:

• +V lead attached to +5V
• GND lead attached to ground
• SIG lead attached to digital pin 7

Bicolor LED

• +V lead attached to pin 8
• GND lead attached to pin 9

Linear 100K Potentiometer

• GND lead attached to ground
• SIG lead attached to A0
• +V lead attached to +3.3V