405_Lab0x01.py File Reference

This file runs the VendoTron FSM. More...

Functions
def	405_Lab0x01.kb_cb (key)
	Callback function inside keyboard module. More...
def	405_Lab0x01.getChange (price, balance)
	This file computes the change for a certain purchase. More...
def	405_Lab0x01.convertToCents (_moneyDict)
	Converts denominations and quantities to cents. More...
def	405_Lab0x01.vendoTronTask (debugFlag, payment)
	Generator used to hold the FSM for the vending machine. More...

Variables
int	405_Lab0x01.S0_INIT = 0
	The init state.
int	405_Lab0x01.S1_WAIT_FOR_ACTION = 1
	Waits for user to press a button.
int	405_Lab0x01.S2_DISPLAY_BALANCE = 2
	Display the current balance.
int	405_Lab0x01.S3_DO_TRANSACTION = 3
	Computations after a drink is selected.
int	405_Lab0x01.S4_QUERY_FOR_DRINK = 4
	Ask user for another drink.
int	405_Lab0x01.S5_RETURN_CHANGE = 5
	return change.
int	405_Lab0x01.S6_THANK_USER = 6
	Thank user for buying a drink.
int	405_Lab0x01.S7_TIME_OUT = 7
	System times out and reminds user to finish.
dictionary	405_Lab0x01.denomination
	Dictionary of denominations. More...
dictionary	405_Lab0x01.balance = {1:0, 5:0, 10:0, 25:0, 100:0, 500:0, 1000:0, 2000:0}
	A dictionary of the starting balance, which should be 0.
dictionary	405_Lab0x01.sodas = {'c':('Cuke',100), 'p':('Popsi',120), 's':('Spryte',85), 'd':('Dr. Pupper',110)}
	Dictionary for soda options. More...
dictionary	405_Lab0x01.change = {1:0, 5:0, 10:0, 25:0, 100:0, 500:0, 1000:0, 2000:0}
	A dictionary of the starting change, which should be 0.
list	405_Lab0x01.Keys = ["0","1","2","3","4","5","6","7","e","c","p","s","d","q","y","n"]
	A list of the possible keyboard commands that could be pressed.
	405_Lab0x01.last_key = None
	A variable to hold the last keystroke.
def	405_Lab0x01.vendo = vendoTronTask(False, balance)

Detailed Description

This file runs the VendoTron FSM.

The user will input the quantity of each denomination that they are using to purchase the item, along with the price of the item, and the required drink, and several operations will be utilitized to simulate the workings of an actual vending machine. See source code here: https://bitbucket.org/MatthewFrostCP/me405/src/master/Lab0x01/Lab0x01.py

Figure 1. FSM for VendoTron

Author

Matthew Frost

Date

Originally created on 04/08/21
Last modified on 04/08/21

Function Documentation

convertToCents()

def 405_Lab0x01.convertToCents

(

_moneyDict

)

Converts denominations and quantities to cents.

When a dictionary of denominations and values are inputted, the corresponding value in cents is outputted.

getChange()

def 405_Lab0x01.getChange	(		price,
			balance
	)

This file computes the change for a certain purchase.

The user will input the quantity of each denomination that they are using to purchase the item, along with the price of the item, and the corresponding change will be calculated in terms of the quantity of each denomination that will be returned.

Parameters

price	The price of the selected soda.
balance	A dictionary of the current balance.

kb_cb()

def 405_Lab0x01.kb_cb

(

key

)

Callback function inside keyboard module.

When keyboard is pressed, it automatically gets sent to the callback function to assign a variable the letter pressed.

Parameters

key	The key that was pressed to trigger the callback function.

vendoTronTask()

def 405_Lab0x01.vendoTronTask	(		debugFlag,
			payment
	)

Generator used to hold the FSM for the vending machine.

This implements the finite state machine used to simulate the vending machine. This will handle all the keyboard inputs, timing issues, and is in charge of calling other functions to calculate change and balance.

Parameters

debugFlag	When enabled to True, more print commands are displayed.
payment	A dictionary with the current balance or payment.

Variable Documentation

denomination

dictionary 405_Lab0x01.denomination

Initial value:

=  {'0':('Penny',1), '1':('Nickel',5), '2':('Dime',10),
                    '3':('Quarter',25), '4':('One',100), '5':('Five',500),
                    '6':('Ten',1000), '7':('Twenty',2000)}

Dictionary of denominations.

A dictionary of denominations that has the keyboard button as the key, and then a tuple for the name and amount of each denomination

sodas

dictionary 405_Lab0x01.sodas = {'c':('Cuke',100), 'p':('Popsi',120), 's':('Spryte',85), 'd':('Dr. Pupper',110)}

Dictionary for soda options.

A dictionary of soda options that has the keyboard button as the key, and then a tuple for the name and price of each soda