Traffic Light Simulator

History

When I was in college for Electronics Engineering, one of the projects we did in the microcontrollers course was to build a traffic light simulator using a Motorola 68HC11 MCU. The original project was fairly simple, simulating a 4-way intersection with a priority street and sensors for each street. LEDs were used for the lights and simple pushbuttons were used to simulate cars approaching the intersection.

Ladder Logic

I never pictured myself doing anything with ladder logic, however, back in the late 90s I found myself doing some contract work in the industrial control field and had to understand ladder logic in order to convert systems from PLC control to MCU control. Eventually though, I was in a position to have to use a PLC in a system and the way I decided to learn ladder logic was to use the same example I used in college with the 68HC11. So I built a demo of a 4-way intersection, but this time with crosswalks!

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Resources

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