Quantity   Component name
2 × HC-SR04 Ultrasonic Senors used to range vehicle distance. http://www.sainsmart.com/ultrasonic-ranging-detector-mod-hc-sr04-distance-sensor.html
2 × Trimpot 10K with Knob Used to set desired parked distance from sensor. https://www.sparkfun.com/products/9806
1 × Arduino Pro Mini (5v) The Pro Mini is a greate MCU. They are low cost and have an on-board LDO with a 5-12v input range.
1 × WS2801 RGB Strip (32 LEDs) Life Guage -- live too much and you kill the garage (or some of your stuff).
1 × 5v 2A Power Supply LED Strips draw a fair amount of current, as such this is required to power the whole project, MCU included.