Project Design Documents 1
Project Design Documents
Microcomputer Architecture and Interfacing Colorado School of Mines Professor William Hoff
1
Preliminary Design Review
• Demonstrate that the preliminary design meets the requirements
• Show that the correct design options have been selected, and interfaces identified
• You should show
– An understanding of the requirements
– Schematic diagram(s), with description
– Software flowchart(s) or pseudocode, with description
– Timing diagram(s), with description
– Sketch of physical hardware setup (if appropriate)
• It is ok if you change the design later, but you should at least have a good starting design.
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Microcomputer Architecture and Interfacing Colorado School of Mines Professor William Hoff
Schematic Diagram(s)
• For large systems, it is better to break up things up into subsystems and draw individual schematics for each subsystem
Example (from Todd
Nelson and Ryan
Straily)
System level Schematic
Microcomputer Architecture and Interfacing Colorado School of Mines Professor William Hoff
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Schematic Diagrams (continued)
Example (from Todd
Nelson and Ryan
Straily)
LED Row Schematic
Microcomputer Architecture and Interfacing Colorado School of Mines Professor William Hoff
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Software Design – flowchart example
Flowchart example
(from Todd Nelson and Ryan Straily)
Microcomputer Architecture and Interfacing Colorado School of Mines Professor William Hoff
5
Software Design – pseudocode example
System setup pseudo code
Initialize the PWM system and set to drive PT0..PT4, PM4
Initialize PT0..PT4, and PT7 as outputs
Initialize PM2..PM5 as outputs
Initialize Analog to Digital converter system for AN00..AN05
Initialize the RTI system for regular interval timeouts
Initialize t: a place to hold a running clock
Initialize t check
: the amount of time between motion detecting states
Initialize t wait
: the amount of time to wait before rotating the IR sensor again
Enable RTI Interrupts
Patrol (Line Following) pseudo code
Loop forever:
Read the left and right line sensors
If the right sensor is over the line:
If the left sensor not over the line:
Turn right (right motor stop)
Else drive straight
If the left sensor is over the line:
If the right sensor is not over the line:
Turn left (left motor stop)
Else drive straight
If t > t check
Check for motion (state = Detect)
End
Microcomputer Architecture and Interfacing Colorado School of Mines Professor William Hoff
(from Lucas Cook and Evan Manning)
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Timing Diagram
Example from Todd
Nelson and Ryan
Straily
PD 0..7
PB 1..3
Plane 0
000
Plane 1
001
Plane 2
010
Plane 3
011
Plane 4
100
Plane 5
101
Plane 6
110
Plane 7
111
Plane 0
000
PB 4
Figure 1: Timing diagram for shift register data, plane selection and decoder enable.
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Microcomputer Architecture and Interfacing Colorado School of Mines Professor William Hoff
Physical Setup Sketch
• Sometimes the physical design is a key part of your project
Smart Irrigation
System
(courtesy of
Abdulaziz Alsenaide and Basil AbuHadi)
Microcomputer Architecture and Interfacing Colorado School of Mines Professor William Hoff
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