1 Block Diagramming Donald Heer 10/21/09

2 Overview Block Diagrams Decomposition Interface Definitions

Block Diagrams Why Block Diagrams? Generalized Allows for parallel development Acts as official rules Abstraction Levels Top-Level Lower Levels 3

Block Diagrams (Top Level) 4

Block Diagrams Interface Types Mechanical Electrical Environmental Control Other 5

Decomposition Bottom Up Design Top Down Design Functional Decomposition 6

Decomposition 7

Interface Definitions NameTypeSpecifications Motor Power Electrical12 max 1 Amp Max Regulated Power Electrical5 V DC <.5V ripple 500mA minimum Unregulated Power Electrical14 Volts DC Minimum 1A Minimum <.5V Ripple at full load Current Sense ElectricalAnalog 1 volt per 1 Amp 0 – 2 volt Range Power Electrical14 Volts DC Minimum 1.5A Minimum <.5V Ripple at full load Control ElectricalI 2 C 400Kbps 8 bit Addressing 5 V logic level Env. Environmental0-120 Degrees F Dry to Wet conditions Moderate G Shock (2 Gs) Motion Mechanical360 degree Rotation 200 Max RPM 45 in∙lbs maximum Torque 8

9 Exercise Get into teams Using the ‘Block Diagramming Assignment’ spend 15 minutes developing a block diagram and interface definition. Present your work to the class