The first lab for ME 405 was a re-introduction for Python (or an introduction for those that haven't had ME 305 virtually).

This lab focused on building a finite state machine (FSM) that simulated a vending machine. The building blocks of the lab included using a Python generator to host the FSM, as well as using collections (in my case, dictionaries) to hold the balance in terms of quantities of each denomination (pennies, nickels, etc...).

The goal of this FSM was to allow the user to input money at any time, eject their money at any time, and select a drink when they wanted to. the FSM would keep track of their current balance, and when a drink was selected, it would ensure that the inputted balance could cover the cost of the desired soda. The setup for all the user commands was with keyboard interrupts using the keyboard module. If the user pressed 'c', 'p', 's', or 'd',that would signify that they wanted either a Cuke, Popsi, Spryte, or Dr. Pepper, respectively. For ejecting money, the user would press the 'e'. In order to enter coins or bills, the user would press 0 - 7, which would represent pennies, nickels, dimes, quarters, $1, $5, $10, or $20, respectively. Along with keeping track of the transaction, it had a built-in timer that would prompt the user to finish their purchase if they took too long.

The source code for this project can be viewed online at my personal BitBucket account, linked here: Lab0x01 Source Code

To find the locally-saved files, please use the following link to find the mainscript for this lab:
405_Lab0x01.py

Finally, a state-transition diagram was required for this lab, and helped with implementation of the Python code itself. Figure 1 below shows the appropriate state-transition diagram for the lab.

Figure 1. FSM for VendoTron

Click here for the next lab, 405 Lab 0x02: Reaction Times