Team Mejor – The Spyder Power Requirements and Distributions Dave Millar Brian Shula - 10/12/04

Design Overview  String and Spool Location Method Encoder to measure distance to origin. Absolute encoder/potentiometer to measure angle relative to chassis Compass mounted to chassis for orientation  Use Mini-Max microcontroller  Two independently driven tires, with 12V motors

Electronics Schematic 12V Battery Power Switch MotorH-BridgeMotorH-Bridge 9V RegulatorSniffer 5V Regulator Encoders Mini-Max Microcontroller Compass Keypad LCD Screen 3V Regulator

Speed and Direction Control  Employ H-bridge to turn tires forward or backward  Use PWM to control speed of motor Ramp up speed when starting Ramp down speed when stopping

Selected Components  Motors Globe Gearmotor 12V 130 mA no load 2 X $18.95

Selected Components  Compass PNI Vector 2Xe Fully digital interface at 3V 2 mA max 2° accuracy Non-volatile memory $55.00

Selected Components  Optrex LCD Screen 16 characters X 4 lines 7V max 0 °C min temp. $11.25

Selected Components  Keypad Only requires power when key is pressed 12V max Waterproof $12.50

Selected Components  Voltage Regulators 5V & 9V regulators Reduces 12V input voltage to necessary output voltages 2 X $0.50

Issues to Further Consider  Detailed wiring diagram of all selected components  Required layout of components on chassis  Selection of battery & charger  Safety Fuses or Circuit Breakers Diodes  Heat byproduct off individual components