Traffic light design based on 51 microcontroller

1. Design requirements: 1. Use the microcontroller stc89C52 to design a traffic light system, and use a digital tube to display the time and LED to indicate traffic.

2. Design circuit diagrams, pcb diagrams, etc.

3. The digital tube is driven by a triode.

4. Button functions: no traffic, east-west traffic, north-south traffic, time increase, time decrease, switch, confirm. 2. Main components of the circuit: 1. Minimum microcontroller system 2. 8-segment digital tube 3. Red, yellow, and green LEDs 4. Transistor drive circuit of the digital tube 3. Main functions: 1. Adopt four-directional digital tube design, more in line with real traffic Signal light design. 2. The buttons on the left side from top to bottom are: set time, time plus, time minus, and emergency mode. 3. Emergency mode: When ambulances, firetrucks, etc. pass by, press the "emergency mode" button, including all four directions of red lights, allowing east-west traffic, allowing north-south traffic, and all green lights. 4. When setting the time, press the "Set Time" button for the first time to set the countdown time in the east-west direction. Press the "Set Time" button again to set the countdown time in the north-south direction. Press it again to exit the setting. status and start running.