设计一个用于十字路口的交通灯控制器，能显示十字路口东西、南北两个方向的红、黄、绿的指示状态；具有倒计时的功能，用两组数码管作为东西和南北方向的倒计时显示，主干道直行(绿灯)60秒后，左转(绿灯)40秒；支干道直行(绿灯)45秒后，左转(绿灯)30秒，在每次绿灯变成红灯的转换过程中，要亮黄灯5秒作为过渡。黄灯每秒闪亮一次。只考虑直行和左转车辆控制信号灯，右转车辆不受信号灯控制， 南北向车辆与东西向车辆交替方向，同方向等待车辆应先方向直行车辆而后放行左转车辆。

以下是一个简单的交通灯控制器的代码示例：

#include <TM1637Display.h>

// 定义数码管引脚
#define EAST_WEST_CLK 2
#define EAST_WEST_DIO 3
#define NORTH_SOUTH_CLK 4
#define NORTH_SOUTH_DIO 5

// 定义信号灯引脚
#define EAST_WEST_GREEN 6
#define EAST_WEST_YELLOW 7
#define EAST_WEST_RED 8
#define NORTH_SOUTH_GREEN 9
#define NORTH_SOUTH_YELLOW 10
#define NORTH_SOUTH_RED 11

// 定义倒计时时间
#define EAST_WEST_STRAIGHT_GREEN_TIME 60000 // 东西直行绿灯60秒
#define EAST_WEST_LEFT_GREEN_TIME 40000 // 东西左转绿灯40秒
#define NORTH_SOUTH_STRAIGHT_GREEN_TIME 45000 // 南北直行绿灯45秒
#define NORTH_SOUTH_LEFT_GREEN_TIME 30000 // 南北左转绿灯30秒
#define YELLOW_TIME 5000 // 黄灯5秒

// 定义数码管显示对象
TM1637Display eastWestDisplay(EAST_WEST_CLK, EAST_WEST_DIO);
TM1637Display northSouthDisplay(NORTH_SOUTH_CLK, NORTH_SOUTH_DIO);

// 定义倒计时计数器
unsigned long eastWestStraightGreenTimeLeft = 0;
unsigned long eastWestLeftGreenTimeLeft = 0;
unsigned long northSouthStraightGreenTimeLeft = 0;
unsigned long northSouthLeftGreenTimeLeft = 0;
unsigned long yellowTimeLeft = 0;

// 定义信号灯状态枚举
enum TrafficLightState {
  GREEN,
  YELLOW,
  RED
};

// 定义东西向和南北向信号灯状态
TrafficLightState eastWestState = GREEN;
TrafficLightState northSouthState = RED;

// 点亮指定方向的绿灯，同时关闭其他方向的绿灯和所有黄灯
void turnOnGreenLight(TrafficLightState &state, int greenPin, int yellowPin, int redPin) {
  digitalWrite(greenPin, HIGH);
  digitalWrite(yellowPin, LOW);
  digitalWrite(redPin, LOW);
  state = GREEN;
}

// 点亮指定方向的黄灯，同时关闭其他方向的绿灯和所有黄灯
void turnOnYellowLight(TrafficLightState &state, int greenPin, int yellowPin, int redPin) {
  digitalWrite(greenPin, LOW);
  digitalWrite(yellowPin, HIGH);
  digitalWrite(redPin, LOW);
  state = YELLOW;
}

// 点亮指定方向的红灯，同时关闭其他方向的绿灯和所有黄灯
void turnOnRedLight(TrafficLightState &state, int greenPin, int yellowPin, int redPin) {
  digitalWrite(greenPin, LOW);
  digitalWrite(yellowPin, LOW);
  digitalWrite(redPin, HIGH);
  state = RED;
}

void setup() {
  // 初始化信号灯引脚
  pinMode(EAST_WEST_GREEN, OUTPUT);
  pinMode(EAST_WEST_YELLOW, OUTPUT);
  pinMode(EAST_WEST_RED, OUTPUT);
  pinMode(NORTH_SOUTH_GREEN, OUTPUT);
  pinMode(NORTH_SOUTH_YELLOW, OUTPUT);
  pinMode(NORTH_SOUTH_RED, OUTPUT);
  
  // 初始化数码管
  eastWestDisplay.setBrightness(0x0f);
  northSouthDisplay.setBrightness(0x0f);
}

void loop() {
  // 检查是否需要切换信号灯状态
  if (eastWestStraightGreenTimeLeft == 0 && eastWestLeftGreenTimeLeft == 0 && northSouthStraightGreenTimeLeft == 0 && northSouthLeftGreenTimeLeft == 0 && yellowTimeLeft == 0) {
    switch (eastWestState) {
      case GREEN:
        turnOnYellowLight(eastWestState, EAST_WEST_GREEN, EAST_WEST_YELLOW, EAST_WEST_RED);
        yellowTimeLeft = YELLOW_TIME;
        break;
      case YELLOW:
        turnOnRedLight(eastWestState, EAST_WEST_GREEN, EAST_WEST_YELLOW, EAST_WEST_RED);
        if (northSouthState == RED) {
          turnOnGreenLight(northSouthState, NORTH_SOUTH_GREEN, NORTH_SOUTH_YELLOW, NORTH_SOUTH_RED);
          northSouthStraightGreenTimeLeft = NORTH_SOUTH_STRAIGHT_GREEN_TIME;
        } else {
          turnOnYellowLight(northSouthState, NORTH_SOUTH_GREEN, NORTH_SOUTH_YELLOW, NORTH_SOUTH_RED);
          yellowTimeLeft = YELLOW_TIME;
        }
        break;
      case RED:
        turnOnGreenLight(eastWestState, EAST_WEST_GREEN, EAST_WEST_YELLOW, EAST_WEST_RED);
        eastWestStraightGreenTimeLeft = EAST_WEST_STRAIGHT_GREEN_TIME;
        break;
    }
  }
  
  // 更新倒计时数码管显示
  eastWestDisplay.showNumberDec(eastWestStraightGreenTimeLeft / 1000, true);
  northSouthDisplay.showNumberDec(northSouthStraightGreenTimeLeft / 1000, true);
  
  // 更新倒计时计数器
  if (eastWestStraightGreenTimeLeft > 0) {
    eastWestStraightGreenTimeLeft -= min(eastWestStraightGreenTimeLeft, 1000ul);
    if (eastWestStraightGreenTimeLeft == 0) {
      turnOnYellowLight(eastWestState, EAST_WEST_GREEN, EAST_WEST_YELLOW, EAST_WEST_RED);
      yellowTimeLeft = YELLOW_TIME;
    }
  } else if (eastWestLeftGreenTimeLeft > 0) {
    eastWestLeftGreenTimeLeft -= min(eastWestLeftGreenTimeLeft, 1000ul);
    if (eastWestLeftGreenTimeLeft == 0) {
      turnOnYellowLight(eastWestState, EAST_WEST_GREEN, EAST_WEST_YELLOW, EAST_WEST_RED);
      yellowTimeLeft = YELLOW_TIME;
    }
  } else if (northSouthStraightGreenTimeLeft > 0) {
    northSouthStraightGreenTimeLeft -= min(northSouthStraightGreenTimeLeft, 1000ul);
    if (northSouthStraightGreenTimeLeft == 0) {
      turnOnYellowLight(northSouthState, NORTH_SOUTH_GREEN, NORTH_SOUTH_YELLOW, NORTH_SOUTH_RED);
      yellowTimeLeft = YELLOW_TIME;
    }
  } else if (northSouthLeftGreenTimeLeft > 0) {
    northSouthLeftGreenTimeLeft -= min(northSouthLeftGreenTimeLeft, 1000ul);
    if (northSouthLeftGreenTimeLeft == 0) {
      turnOnYellowLight(northSouthState, NORTH_SOUTH_GREEN, NORTH_SOUTH_YELLOW, NORTH_SOUTH_RED);
      yellowTimeLeft = YELLOW_TIME;
    }
  } else if (yellowTimeLeft > 0) {
    yellowTimeLeft -= min(yellowTimeLeft, 1000ul);
  }
  
  // 控制黄灯闪烁
  if (yellowTimeLeft > 0) {
    if (yellowTimeLeft % 500 < 250) {
      digitalWrite(EAST_WEST_YELLOW, LOW);
      digitalWrite(NORTH_SOUTH_YELLOW, LOW);
    } else {
      digitalWrite(EAST_WEST_YELLOW, HIGH);
      digitalWrite(NORTH_SOUTH_YELLOW, HIGH);
    }
  }
}

需要注意的是，该示例只是一个简单的实现，可能并不完美，实际应用时需要根据具体情况进行适当调整和优化。同时，为了简化代码，该示例没有考虑多个车辆同时通过的情况，实际应用需要根据实际情况进行调整。