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Contents xiii

The NOT Gate 161
Building the Gates 163
The Pistons 163
The Handle Straps 165
The AND Handles 166
The AND Gates 167
The OR Handles 172
The OR Gates 173
AND Gate Tube Guides 178
OR Gate Tube Guides 180
The Issue of Sensors 182
The Potentiometer Brick 183
The Sum Sensor 186
The Carry Memory 188
Powering PneumADDic II 192
The Dual Motor Switch 193
The Pump Walls 200
The Pump 202
The Digital Pressure Sensor 206
The Motorized Switches 211
The Keyboard Module 218
Keyboard Column Sensor 221
Left Keyboard Buttons 223
Right Keyboard Buttons 224
The Keyboard Rows 225
The Keypad 227
Completing the Keyboard Module 230
Adding Two Bits 237
Putting It All Together 239
Calibrating PneumADDic II 257
Using PneumADDic II 259
Troubleshooting PneumADDic II 259
Programming PneumADDic II 259
Summary 271