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■ CONTENTS
Resistor Networks .............................................................................................................................. 409
Pushbuttons ........................................................................................................................................ 410
DIP Switches ....................................................................................................................................... 411
Jumpers and Shorting Blocks............................................................................................................. 411
Tilt Sensor ........................................................................................................................................... 412
Temperature Sensors ......................................................................................................................... 413
Touch Sensors .................................................................................................................................... 413
Object Detection and Infrared Remote Control ................................................................................... 414
Distance and Object Sensor ............................................................................................................... 415
Oscillators and Crystals ...................................................................................................................... 415
Sound ................................................................................................................................................. 416
Relays ................................................................................................................................................. 417
Adding Gears ...................................................................................................................................... 417
Servos ................................................................................................................................................. 418
Encoders—Determining Wheel Speed ............................................................................................... 419
Displays .............................................................................................................................................. 420
Wireless Data and Control .................................................................................................................. 421
Everyday Challenges .................................................................................................... 421
Houseplant-Watering Robot ................................................................................................................ 422
Compost Cart ...................................................................................................................................... 422
Trash Emptier...................................................................................................................................... 422
Window Washer .................................................................................................................................. 422
Roof Rat .............................................................................................................................................. 422
Micro Snowplow ................................................................................................................................. 423
Slug Squisher ..................................................................................................................................... 423
Automatic Street mailbox ................................................................................................................... 423
Contests ....................................................................................................................... 423
Worldwide Robot Sumo ...................................................................................................................... 423
Trinity College Fire-Fighting................................................................................................................ 424
Atlanta Robot Vacuuming ................................................................................................................... 424
Seattle Robotics Society Robothon ..................................................................................................... 425