the circuit components are used: 78M05 CCD4011
Figure shows the automatic control circuit of traffic lights intersection. The controller is mainly composed of four 555 (IC2 ~ IC5) and a number of RC element consisting of four one-shot delay circuit from end to end. 8V input voltage through the 78M05 voltage regulator to provide 555 after VDD=+5 V power supply voltage.
When the first power, the trigger pulse by IC1 (CD4011) gate and the R1, C1 delay, and then by C2, R22 add IC2 differential pin after the trigger IC2 output high, into temporary state, the temporary steady-state length of time depends on the K1 time position, the delay td=1.1RC6, set the time for 60 seconds, 45 seconds, 30 seconds. Temporary steady-state end, IC2 feet low, and then through C3, R23 derivative, the falling edge and trigger IC3, the formation of the second level one-shot delay. This in turn trigger the time to complete the green light - yellow light (8 seconds, 10 seconds, 12 seconds) - the red light (60 seconds, 45 seconds, 30 seconds) cycle.
For the control circuit of the circuit and conductor booth parts of the monitoring display. If true for traffic control, should be to motivate the solid state relay control signal, and then to drive the LED light bulb work.
The controller circuit end to end by four, followed by the trigger delay, so that there traffic lights turn green - yellow - red (color) signal, directing pedestrians and vehicles in the crossroads I=1 orderly traffic (green) - to remind Note (yellow) - closed to traffic (red).