Digital Systems Lab 14

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Lab 14: Traffic Light State Machine

Download Lab Manual

Errata

The fall 2024 version of the lab manual has an issue. All expressions that you derive should be minimum.

Breaking Lab 14 Into Parts

You may not be able to finish this circuit if you do not have a solid plan for building the circuit. Here are the steps you should take to build the circuit.

  • First wire up the monostable timers with active LOW pushbuttons to ensure that they function correctly (use LEDs on the output pins).
  • Then build the FSM and put LEDs on the flip-flop outputs to ensure that the FSM cycles through each state properly (you should see the LEDs light up consistent with your state assignments).
  • Finally, include the synchronous output LEDs. Don’t remove any of the other diagnostic LEDs until you get everything working.

Other Tips

  • Use a clock frequency of at least 500 Hz once the monostable timers are wired into the finite state machine
  • Keep notes of what’s connected to each logic gate
  • Use wire colors to stay organized

Resources

Watch/read the following resources prior to attending this lab. This information will teach you how to use lab equipment and provide suggestions and technical tips for successfully completing the lab.