Description: is useful because the design is the control of traffic lights, first understand the traffic lights change. Assuming a crossroads for the east-west north-south. Initial state of things 0 red light, red light north-south. Then the state opening of a north-south green, red things. For a period of time to state 2-green flashing yellow light switch several times, a few seconds delay, things are still red. Three sub-state, opening things green, red light north-south. For a period of time to state four, several things turn green blinking yellow light, a few seconds delay, the North and the South is still red. The last cycle to a state. 2. Two-color LED is a red LED tube core and a core package of green together, the common negative side. When the red is added to I-Greenpeace-Canada is low-level,
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