Soda Machine

1 Goals
2 Ideas
3 Useful Links
4 People working on this project
5 The Hardware
6 The Original Software
7 Repository
8 New Parts
9 Wire lengths
10 things to remember about software
11 notes on software
12 To Do

Goals

Be able to select soda and have it drop from the computer.
have the microcontroller notify when a soda is out, and send an e-mail to the current cokehead

Ideas

some way of detecting when a product is out, and possibly sending out a notification e-mail
- I was wondering what we'd do if we detected the soda was actually out...It seems most useful only if we could tell the machine which soda we wanted and it dropping, rather than having to push the button --Will
move the soda machine to the first floor (student lounge?) so that people actually see it
- Definitely. -- Will
fix login thing so enter and tab actually work right
use UW id cards to dispense soda (barcode and or RFID reader) as a sort of speedy way to get a soda
- there is a commercial barcode scanner in the upl, not sure if it works or where it came from. Also, the potential for abuse might be raised if all you need to buy soda is someone's student id. - Aaron
- I think that this isn't the best idea, for the reasons Aaron said, as well as the fact that we'd have to deal with the UW to allow this. --Will
  - While the potential for abuse still remains, I think it'd be a good idea to try this, since we don't need to deal with UW, all we need to do is tie a barcode to an account. --Will
pick drink from computer instead of having to hit the button on the machine
logging of drink selection by date, type, and account
status of how many cans left
better database set up
web interface to statistics and accounts
Paypal and/or Google Checkout integration for automatic payment processing

From Bart after client program demo:

if a soda isn't stock, don't allow the user to select it
a web interface that allows a user to check the status of the machine, and possibly do account maintenance
make the buy soda page look like a soda machine
client program cannot buy soda if not running on right machine
some kind of indication of if soda is warm
secure source code in /p on afs and lock it down with ACLs

Useful Links

http://www.cs.wisc.edu/sacm/coke/cokehome.html

http://www.cs.cmu.edu/~coke/history_long.txt

http://www-cse.ucsd.edu/users/bsy/coke.html

http://en.wikipedia.org/wiki/Rabbit_Semiconductor

http://www.lvr.com/ethernet.htm

http://www.rabbit.com/products/rcm3200/index.shtml

http://www.electro-tech-online.com/

http://jdbc.postgresql.org/

https://www.cs.wisc.edu/twiki/bin/view/CSDocs/UnsupportedNetworkFAQs

People working on this project

Jeff - hardware
Matt - hardware
Will - software
Aaron - software
Alex - software

The Hardware

coke.cs.wisc.edu Runs REHL Server 5.2

serial output to a parallel converter. attached to that is a single wire that goes into the back left of the coke machine

The coke machine is a Dixie-Narco Inc Model DNCB 368/216-7 owned by the CS Dept since at least 1980

The Original Software

is located in ~sacmuse/coke on afs

written in perl and uses the gui editor glade

sends a break signal for 250 milliseconds to /dev/ttyS0 (the serial port) to dispense soda

Repository

svn+ssh://svn.upl.cs.wisc.edu/svn/coke

New Parts

Wire lengths

switches -> relays

40 inches or 3.33 ft
- 4 runs per switch comes to 32 runs
- 106.66 ft needed

relays -> uC

45 inches or 3.75 ft
- 34 runs
- 127.5 ft needed

power -> uC

56 inches or 4.66 ft

things to remember about software

listOfFrostyDrinks.txt needs to be read-only.
- helpFile.txt too.

notes on software

Need to check if we're out of soda when:
- first applet is first loaded //or not. Just going with whenever someone buys a soda.
- when the second applet (the buy screen) is loaded.
- whenever someone logs in
- whenever someone buys a soda (just to be safe)

readInSodas() has a hard-coded link to a file in it. Fix it.
- Also readInHelpFile().
Get the "correct" list of default sodas. Add it to readInSodas().

Colors of "In Stock":
- Red is (180,0,0).
- Green is (0,120,0).

Will need to log-back in if there's network difficulties.
Turn off all the debug statements and stack printouts for final version!

To Do

thank you letter to Morrow
sanitize inputs
- make sure can't set low water mark > MAX_INT
- no little bobby tables
- transfer amount and transfer to
modularize
account info ... X
hashing passwords
proper help file
Rug testing
send emails for low water mark
take over the world

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