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well i want to make LED traffic signal with the help of 555 timer IC ,i know thte function of mutiplexer,decoder etc. i know the logic how to operate the LEDS but as i am a beginner in the field of electronics so i want to ask that i want to give for example  0    1 logic for RED LED    and 0  0 logic for green led .So how can i give this input logic to decoder .0  0  or  0  1  or  1    0  or  1  1.

how this binary input can be given .
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