State Machine - Toll Booth

In this project, we were to make a Toll Booth using our knowledge of vex parts, breadboards, and Multisim. If the toll booth is at the bottom, a light will turn on so the user can press the “up” button to start the motor that will make the toll booth rise. Once the bar has reached the top, it will stop and turn on another light, to indicate that it has reached the top, and will allow the “down” button to be pressed so that it will return to the bottom. First we found all of the vex robot parts that we needed to create the model toll booth. After this, we started to make a rough design in Multisim, using three inverters, four AND2 gates, eight AND3 gates and two OR4 gates, two d flip-flops, in which the motor and lights would follow the situation described above. Next we started building the physical circuit on a circuit board, using a H-Bridge, and a Cmod S6. We wired the circuit for the H-bridge and the motor following the data sheet such that the motor will turn off once the top or bottom limit switches were hit, and will turn on according to the position of the motor (if the lever is at the bottom it will go up and vice versa). Next we connected the switches to the Cmod, using resistors because the circuit ran on 5 volts and the vex parts ran on less. Finally, we connected the Cmod-switch assembly to the H-bridge-motor assembly, tested it, and verified that it worked.