In this part...
T
homas Edison discovered what fun light can be in
electronics projects when he invented the light bulb.
In the projects in this part, you use light in several forms.
For example, you work with tiny LED lights that dance
across a display of dolphins; use infrared light to signal a
go cart when to go and when to stop; and use an infrared
beam to detect motion to set off lights and sound in a
snazzy Halloween display.14_009683 pt03.qxp 6/22/06 9:36 PM Page 186