帮我写个arduino代码实现以下功能：1.基于L892N 不用ENA与ENB只用红外遥控控制小车前进后退转弯2.按钮控制无源蜂鸣器播放音乐，按一下开始播放，再按一下停止播放3.用dht11库让dht11温湿度传感器的温湿度显示在lcd1602a上面4.只用一个循迹模块实现舵机转动，碰一下转动一下

好的，以下是实现以上功能的Arduino代码，请参考：

#include <IRremote.h> //红外遥控库
#include <LiquidCrystal.h> //LCD库
#include <dht.h> //dht11温湿度传感器库

#define IR_PIN 11 //红外遥控接收器接口
#define BUZZER_PIN 12 //无源蜂鸣器接口
#define DHT_PIN 2 //dht11温湿度传感器接口

IRrecv irrecv(IR_PIN); //红外遥控接收器对象
decode_results results; //红外遥控解码结果对象
LiquidCrystal lcd(7, 8, 9, 10, 13, 14); //LCD对象
dht DHT; //dht11温湿度传感器对象

int leftTrackPin = A0; //循迹模块左传感器接口
int middleTrackPin = A1; //循迹模块中间传感器接口
int rightTrackPin = A2; //循迹模块右传感器接口
int servoPin = 5; //舵机接口
int buzzerState = LOW; //无源蜂鸣器状态
int buzzerFlag = 0; //无源蜂鸣器标志
int lastButtonState = LOW; //按钮上一次状态
int buttonState = LOW; //按钮当前状态

void setup() {
  //初始化红外遥控
  irrecv.enableIRIn();
  //初始化LCD
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.setCursor(0, 1);
  lcd.print("Humi:");
  //初始化舵机
  pinMode(servoPin, OUTPUT);
  //初始化按钮
  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, buzzerState);
  //初始化循迹模块
  pinMode(leftTrackPin, INPUT);
  pinMode(middleTrackPin, INPUT);
  pinMode(rightTrackPin, INPUT);
}

void loop() {
  //红外遥控控制小车运动
  if (irrecv.decode(&results)) {
    switch (results.value) {
      case 0xFD00FF: //前进
        digitalWrite(servoPin, LOW);
        analogWrite(3, 150);
        analogWrite(6, 150);
        break;
      case 0xFD807F: //后退
        digitalWrite(servoPin, LOW);
        analogWrite(3, -150);
        analogWrite(6, -150);
        break;
      case 0xFD50AF: //左转
        digitalWrite(servoPin, HIGH);
        analogWrite(3, 150);
        analogWrite(6, 150);
        break;
      case 0xFD10EF: //右转
        digitalWrite(servoPin, LOW);
        analogWrite(3, 150);
        analogWrite(6, 150);
        break;
      default:
        break;
    }
    irrecv.resume();
  }
  //按钮控制无源蜂鸣器播放音乐
  buttonState = digitalRead(BUZZER_PIN);
  if (buttonState != lastButtonState) {
    if (buttonState == HIGH) {
      if (buzzerFlag == 0) {
        tone(BUZZER_PIN, 1000, 500);
        buzzerFlag = 1;
      } else {
        noTone(BUZZER_PIN);
        buzzerFlag = 0;
      }
    }
    lastButtonState = buttonState;
  }
  //dht11温湿度传感器读取温湿度并在LCD上显示
  int chk = DHT.read11(DHT_PIN);
  lcd.setCursor(5, 0);
  lcd.print(DHT.temperature);
  lcd.print("C ");
  lcd.setCursor(5, 1);
  lcd.print(DHT.humidity);
  lcd.print("% ");
  //循迹模块控制舵机转动
  if (digitalRead(leftTrackPin) == HIGH) {
    digitalWrite(servoPin, HIGH);
    delay(500);
  } else if (digitalRead(middleTrackPin) == HIGH) {
    digitalWrite(servoPin, LOW);
    delay(500);
  } else if (digitalRead(rightTrackPin) == HIGH) {
    digitalWrite(servoPin, HIGH);
    delay(500);
  }
}

请注意，此代码仅供参考，具体情况需要根据你的硬件连接和需求进行适当修改。