Title Page:
Paper:
The tollbooth gate state machine has four inputs and four outputs. The four inputs are open switch (OS), close switch (CS), open limit (OL), and closed limit (CL). The two state variables are Qa and Qb (Qa=Da...Qb=Db). The four outputs are motor open (MO), motor closed (MC), gate open (GO), and gate closed (GC). We are simulating a toll booth that has an arm that moves up and down when a certain signal is given.
Multisim: |
VEX: |
Conclusion:
My group and piper designed a prototype of a tollbooth using a VEX kit and pictures of what it should look like. Since I had three people in my group we split the work evenly. Piper did the packet while I built the toll booth, and Ryan worked on the multisim part. Once the building part was complete it was time to program the tollbooth to do its job. Using Multisim my partner and I Programmed our PLD to work with the given inputs and outputs to make the tollbooth raise and lower using a switch and remain in the open position until triggered to return to close. It was difficult to wire the breadboard because the picture was hard to read and we could have had different pins. Since our teacher is not here we had to ask our peers to help us. After troubleshooting the machine many times we decided to go back through and rewire the wires in multisim to make sure that the outputs and inputs were wired correctly. After rewiring the multisim the vex tool booth worked. I learned that schematics are difficult to understand and learn, but once you use the skill it becomes easier to understand. They are definitely easier now then at the beginning of the year. I would take more time to correctly go through the multisim and slow down to check that all the wires are correct. I would also make everything more organized.
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