#include <U8g2lib.h>
#include "u8g2_font_shnufont.h"
#include "pitches.h"
#include "song.h"
int switchState = 0;
int prevSwitchState = 0;
const int switchpin = 3;
const int redled = 12;
const int greenled = 8;
const int relay = 13;
int sensorValue = 0;//红外传感器读数
const int sensorPin = A0; // 红外传感器引脚
U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ A5, /* data=*/ A4, /* reset=*/ U8X8_PIN_NONE);   // All Boards without Reset of the Display

void setup(void) {
  u8g2.begin();
  u8g2.enableUTF8Print();		// enable UTF8 support for the Arduino print() function
  u8g2.setFont(u8g2_font_shnufont);
  u8g2.setFontDirection(0);
  pinMode(redled, OUTPUT);
  pinMode(greenled, OUTPUT);
  pinMode(6, OUTPUT);
  length = sizeof(tune) / sizeof(tune[0]);
  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
  pinMode(relay, OUTPUT);
  pinMode(switchpin, INPUT);
}

void loop(void) {
  switchState = digitalRead(switchpin);
  sensorValue = analogRead(A0);
  u8g2.clearBuffer();
  
      digitalWrite(greenled, HIGH);//点亮绿灯
      u8g2.setCursor(0, 15);
      u8g2.print("绿灯可以通行");
      u8g2.sendBuffer();
      delay(5000);
      digitalWrite(greenled, LOW);
      digitalWrite(redled, HIGH);
      u8g2.setCursor(0, 15);
      u8g2.print("红灯禁止通行");
      u8g2.sendBuffer();
      if (sensorValue > 150) {
        u8g2.setCursor(0, 50);
        u8g2.print("闯红灯请退回");
        u8g2.sendBuffer();
        for (int i = 0; i < length; i++)
        {
          tone(6, tune[i]);
          delay(400 * durt[i]);
          noTone(6);
        }
        
      }
      delay(10000);
    

  
}