Lab 14: Traffic Light State Machine
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.
- Textbook: Chapter 13
- Video: Traffic light state machine circuit
- Website: 555 monostable circuit calculator