Traffic signal system based on STC32G12K128

The STC32G12K128 microcontroller serves as the core of this traffic signal control system. Its ultra-high-speed 32-bit 8051 core (1T) provides rapid processing capabilities, making it an ideal choice for implementing complex traffic logic control. The system design considers the basic functions of traffic lights and their responsiveness to changes in traffic flow. The system uses three buttons to simulate traffic flow in different directions. These buttons are directly connected to the GPIO ports of the STC32G12K128, utilizing some of its 49 interrupt sources to achieve real-time traffic flow change detection. The MCU controls the state changes of the traffic lights based on the button inputs and preset traffic flow logic. The traffic lights use red, green, and yellow LEDs to represent different signal states. These LEDs are controlled by the MCU's GPIO ports through simple digital outputs. To ensure high brightness and long lifespan of the traffic lights, the LED driver circuit design must consider appropriate current and voltage levels. A common-anode digital tube serves as a countdown display, driven by the MCU's GPIO ports through a PNP transistor 8550, achieving high-level control. The countdown information displayed on the digital tube is based on the traffic light state and preset time parameters, providing drivers with clear signal change prompts. The system uses a Type-C interface for power supply. This design not only provides a universal and easy-to-use power supply method, but also ensures that the system can obtain stable and sufficient power.