MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
What’s On for this week ?
1) 1st lab period
•
L1 - Intro to Stack (last thing, take circuit apart)
•
Work on draft report for L1
•
L2 - PBASIC exercises (VISIO for flowcharts)
•
Work on draft report for L2 (or submit)
2) Tutorial
•
Rewire circuit, note errors, submit L1 report
•
Complete L2, submit L2 report
3) 2nd lab period
•
L3 – Light Sensing with the Stack
1
Notes on the Stamp Stack (prelab for L1)
Press the white button, LED’s flash sequentially
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MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
Report WORD template
on lab website
http://me.queensu.ca/courses/
MECH452/samples/
1 or 2 sentence answers
(but full sentences)
Don’t forget the
details.
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MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
Measured resistance will be close, but how close ?
Protoboard Tutorial
(see Useful Links on course website)
http://www.kpsec.freeuk.com/breadb.htm
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MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
Notes on PBASIC Programming (prelab for L2)
Lab objective is to introduce the student to the PBASIC
language, editor, compiler and help menu.
Some good habits (for writing software):
• lots of comments
• indented structure
• lots of subroutines
• variable names with context
• flow charts (that follow drawing rules)
• partner can look at code and understand it
Header,
program
description
comments
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MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
indent to
clarify
loop
structure
DEBUG
statements for
troubleshooting
subroutines
for
repetitive
tasks
Use PBASIC help on toolbar
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MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
Things to learn about: variable types & names
Four different variable types
Reserved variable names
Things to learn about: memory management
Lab #4
ROM for lines of code
RAM for
variables
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MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
Things to learn about: flow charts for design
Only 5 symbols (subroutine not shown)
Flow charts
must have
correct
symbols, but
also just
enough detail to
impart to the
reader the logic
(it’s an art).
More than 15 ?
You need a
subroutine.
Copy
drawing
Drag
and drop
Use pointer or
line connector
Double
left click
to add
text
Free 60 day trial at
http://visiotoolbox.com/2010/trial-downloads.aspx
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MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
Flow chart supplement
on lecture website
http://me.queensu.ca/courses/
MECH452/lectures/
Coffee maker
example
Start
Decision
(loop)
mistake #1
Node
Process
mistake #2
mistake #3
Vertical
When writing a new
program, start with a
draft (VISIO) flow
chart, then write the
code. Final (VISIO)
flow chart required for
the written report.
Marks will be lost in
Lab #2 Report if you
don’t follow the rules.
Stop
mistake #4
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MECH 452 2010 Lecture #2 (prelab L1 and L2) rev1
mistake #1
where’s the
No ?
Another VISIO
example (Lab #4
with LynxBot)
mistake #3
Too many
symbols ?
mistake #2
missing stop
statement
1) Pick partner (and workstation)
2) Sign on “studiolab” (not qlink),
password is “ILCP”
3) Download WORD template &
programs from web and save to
your directory (eg. Group B12)
4) Perform L1 (about 1 hr)
5) Take circuit apart, draft L1 report
6) Perform L2 (about 1 hr)
7) Draft L2 (and submit ?) report
8) Don’t print any report until TA
checks it for technical errors
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