9 Drag Race Timer
In Project 4, you built a reaction timer to measure how fast you can hit a button. In this project, you’ll build on the techniques you learned there to make a race timer for a Hot Wheels-inspired race track (see Figure 9-1). We’ll show you how to display the finish time on a small, portable LCD screen so that you can detach your project from your computer. We’ll also show you how to hack this project to add a second track and indicator lamps (LEDs) to show which car has won. Are you ready?
FIGURE 9-1: The completed Drag Race Timer
MATERIALS TO GATHER
Many of the parts used in this project will be familiar to you already (see ...
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