Traffic Light 03 — Timed Sequence (TON)

Briefing

Program one approach's full cycle: green for 3 seconds, then yellow for 1 second, then red — chained TON timers and SET/RESET phase bits, no repeat yet. This introduces the exact one-shot POWER_ON AND /INIT guard pattern the final capstone uses, at roughly a third of the full controller's complexity.

Objectives

• POWER_ON true starts NS_GRN for 3 seconds
• NS_GRN times out into NS_YEL for 1 second
• NS_YEL times out into NS_RED, which then holds — no repeat

I/O Table

Your program will be tested against:

All test cases run automatically when you submit. Assertions are hidden until you pass.

1. #1Green -> yellow -> red, in order

   NS_GRN for 3s, then NS_YEL for 1s, then NS_RED

2. #2Red holds — no repeat

   Once parked at red, the sequence does not loop back to green