In this thesis writing process, I consider a variety of design and technology. Combination of subjects (small system), which ultimately I chose to adopt a purely digital circuit. At the circuit design process, through a series of modifications and the use of Multisim simulation, finally identified the design.
This traffic signal controllers for the main structure: the clock circuitry, timing control circuit, the countdown display circuit, control circuit 15 seconds.
This system uses the main techniques are: sequential logic circuit technology. Overall, the sequential circuit by combinational circuits and storage circuits composed of two parts. At any one time not only with the output signal of the input signal at the time, but also with the circuit related to the original status.
Design of sequential circuits to control the traffic lights, one set of eight start status: 1, train from west to east is not pressure on x1; 2, from west to east pressure on x1; 3, from west to east is located between x1 and x2; 4, from west to east pressure on x2; 5, train from east to west is not pressure on x2; 6, from east to west pressure on x2; 7, from east to west is located between x2 and x1; 8, from east to west pressure on x1. Conversion of traffic lights can not be achieved. Solution: The 5 status 1 status and be merged into the "train is located outside of x1 and x2."
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