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Vending machine Status: Idle, Green traffic in one direction can proceed…
Vending machine
Status: Idle
Get the payment
Wait for select the drink
Get the drink is selected
Caludate
the payment is sufficient
Calculate payment for return
the payment have the change
Return the chosen drink and the change
The payment don't have the extra money
Return the chosen drink
the payment is insufficient
Display error message
Returns the payment
displays the available drinks and their prices
cola: XX.XX $
lemonade: XX.XX
iced tea: XX.XX $
Green
traffic in one direction can proceed
15s
Yellow
traffic in all directions must prepare to stop.
5s
Red
traffic in all directions must stop.
10s