51 Single-chip traffic lights demo program (eight-way lights then p0 I) The first state: trunk, branch roads are red second 5S** status: a green light trunk 30S, branch roads red** Article three states: a main road the green light flash 3 times to bright yellow, red branch trunk fourth 3S** Status: trunk red, green light sticks roads 25S** the fifth state: trunk-Liang Hung lights, roads branch green flash 3 times to bright yellow 3S** to return to the second state

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