388 Smart Traffic Light Controller
388 : Smart Traffic Light Controller
- Author: Kaisy Maina
- Description: A smart traffic light controller with pedestrian and emergency controls
- GitHub repository
- Open in 3D viewer
- Open in Tiny Tapeout Explorer
- Clock: 50000000 Hz
How it works
The smart traffic light controller uses a finite state machine to control the car and pedestrian traffic lights. The car lights follow a sequence of green, yellow, red, and yellow states. A pedestrian button request is remembered by the controller and is serviced when the car light reaches the red state. During pedestrian crossing, the pedestrian light turns green, the car light remains red, and the buzzer provides a repeating audible signal. An emergency button toggles emergency mode, which turns all lights red. Pressing the emergency button again returns the controller to the normal sequence starting from red.
How to test
The design can be tested using the included Cocotb testbench. Fast test mode is enabled using ui_in[2] so that the traffic-light timing is shortened during simulation. The testbench checks the normal traffic-light sequence, pedestrian crossing, pedestrian buzzer operation, and emergency toggle behavior.
Run the tests from the test directory using:
make
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | Pedestrian button | Car red light | |
| 1 | Emergency toggle button | Car yellow light | |
| 2 | Fast test mode | Car green light | |
| 3 | Pedestrian red light | ||
| 4 | Pedestrian green light | ||
| 5 | Pedestrian buzzer | ||
| 6 | |||
| 7 |