Robot Building for Beginners, Third Edition

CHAPTER 10 ■ LEDS

The green, yellow, and red LEDs tend to be inexpensive. In fact, all of the colored LEDs combined cost
less than the white LEDs. I could have chosen something other than white to light the path, but it wouldn’t
have reflected as well off of all possible path colors.
Not only do cool-looking LEDs bring attention to your robot, but also they can be tremendously helpful
in diagnosing a problem when used as indicators. It’s a good idea to have a bunch lying around.
You’ve read through ten chapters of the book. Perhaps the battery, alligator clips, resistors, and LEDs
provide enough parts to build a circuit? Let’s find out.

Figure 10-18. Eleven LEDs light up Sandwich.