Prepare a rectangular blue cardboard with a width of about 6 cm, fold the long side in half and paste it (more firmly). Next, fold the short side in half. Fold the bottom 90 degrees to both sides, and then stick the rest together. Then stick a black rectangular cardboard on the top. Cut red, yellow and green cards into circles and paste them. Finally, just cut a rectangular piece of paper and paste it, and a simple traffic light is made.

First, prepare a piece of cardboard, draw the general shape of the traffic lights on the cardboard, and then draw three circles on the cardboard with compasses. Cut them out, cut them out, and paint them on the traffic lights in red, yellow and green, so that the manual traffic lights are completed.

Simple traffic light circuit is a simple application of pulse digital circuit. The function of lighting different traffic lights in different directions during different time countdown is designed, and seven digital tubes are used to display the time. This traffic light can realize the color conversion of red, yellow and green light in the east-west and north-south directions, and the next step is to emit light in four stages. In case of emergency, you can manually control the red lights in four directions to light up.

Firstly, the working principle of traffic signal lamp model making is discussed. The second is the design and manufacturing method of traffic signal lamp model. Finally, the function of making traffic signal lamp model.