In this Instructable I'll show you how to make a electronic dashboard for a bicycle. We'll be using an Arduino and a few off-the-shelf parts to create a system with light control and an LED speedometer. Step 1: Materials Arduino Micro (RadioShack #: 276-258) 12V 10W halogen bulb (RadioShack #: 272-011) (2x) 12V lamp (RadioShack #: 272-336) (6x) LED holder (RadioShack #: 276-080) (3x) green LED (RadioShack # ...