A A and B two access roads intersect into four blocks each with a set of red, yellow and green lights, with two digital tube countdown display.

The 1 basic functions of the system requirements

(1) the second timing unit, two digital tube count in decimal form timing display, in a count back to zero for instantaneous lamp operation.

(2) through the keyboard of red, yellow and green lights are bright set in any 0 to 99 seconds.

(3) traffic lights at the crossroads of the traffic starting state can be artificially set, run through the manual intervention to make the intersection traffic situation is fixed in any kind of work mode.

2 play the part

(1) with the time control function, traffic signal lamp working time: 05:00 ~ 23:00; the rest of the two main street lights flashing yellow signal;

(2) the last 3 seconds of the countdown of the green signal light and the yellow signal light display. (frequency: 1Hz);

(3) other functions. The C program and the specific needs of some of the stuff

The traffic signal lamp manufacturers Xiaobian consolidation