14 October 2004AME 470 – Team Unum PDR #6 – 14 October 2004 Electrical Components Chris Tilton Team UNUM

14 October 2004AME 470 – Team Unum Main Electrical Needs Supply power to components Provide an interface with the user Accurately control inflation

14 October 2004AME 470 – Team Unum Power Supply Options Rechargeable Battery Pack –Unsafe if designed incorrectly Standard Batteries –Short life –High cost AC to DC Converter –Battery life not an issue –Reduced portability

14 October 2004AME 470 – Team Unum Power Supply Design Voltage Requirements –Solenoid needs 24 volts input –MiniMAX needs 6 – 12 volts input –Transducer needs 5 volts input MiniMAX SOLENOID TRANSDUCER 24 V DC 6 V DC CONVERTER 5 V DC REGULATOR 110 V AC

14 October 2004AME 470 – Team Unum User Interface Needs: –Method for user to input pressure settings –Display to show user’s settings and current pressure status Solution: –4 pushbuttons (12-button keypad not needed) –LCD screen (parallel, 8 bit, 20x4 characters)

14 October 2004AME 470 – Team Unum Microcontroller MiniMAX takes input from user, displays system status on LCD MiniMAX controls the solenoid based on user settings and transducer readings MiniMAXSOLENOID TRANSDUCERUSERLCD BUTTONS

14 October 2004AME 470 – Team Unum Task Tracking Average Engineer Hours vs. Week

14 October 2004AME 470 – Team Unum Upcoming Activities PDR #7: Microprocessor Programming and General Controls Thursday, October 28 Questions?