基于Arduino的开空调提醒实验（温湿度模块、语音录放、1602显示屏）

//**************************库文件部分**************************
#include <LiquidCrystal_I2C.h>//I2C1602显示屏头文件
#include <Wire.h>//I2C头文件
LiquidCrystal_I2C lcd(0x27,16,2);//I2C1602显示屏地址、坐标
int PE=4;
int k=1;
//**************************温湿度计算部分**************************
double Fahrenheit(double celsius)
{
return 1.8 * celsius + 32;
}    //摄氏温度度转化为华氏温度
double Kelvin(double celsius)
{
return celsius + 273.15;
}     //摄氏温度转化为开氏温度
// 露点（点在此温度时，空气饱和并产生露珠）
// 参考: http://wahiduddin.net/calc/density_algorithms.htm
double dewPoint(double celsius, double humidity)
{
double A0= 373.15/(273.15 + celsius);
double SUM = -7.90298 * (A0-1);
SUM += 5.02808 * log10(A0);
SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
SUM += log10(1013.246);
double VP = pow(10, SUM-3) * humidity; double T = log(VP/0.61078);  // temp var return (241.88 * T) / (17.558-T);
}
// 快速计算露点，速度是5倍dewPoint()
// 参考: http://en.wikipedia.org/wiki/Dew_point
double dewPointFast(double celsius, double humidity)
{
double a = 17.271;
double b = 237.7;
double temp = (a * celsius) / (b + celsius) + log(humidity/100);
double Td = (b * temp) / (a – temp);
return Td;
}
//**************************温度传感器文件部分**************************
#include <dht11.h>//引用头文件
dht11 DHT11;//申明函数名称
#define DHT11PIN 2//定义DHT11引脚
void setup() {
//**************************初始值设定部分**************************
Serial.begin (9600);
Serial.print(“LIBRARY VERSION: “);
Serial.println(DHT11LIB_VERSION);
Serial.println();//显示名称字符
}
void loop()
{

//**************************温度传感器输出部分**************************
Serial.println(“\n”);
int chk =DHT11.read(DHT11PIN);
Serial.print(“Read sensor: “);
switch (chk)
{
case DHTLIB_OK:
Serial.println(“OK”);
break;
case DHTLIB_ERROR_CHECKSUM:
Serial.println(“Checksum error”);
break;
case DHTLIB_ERROR_TIMEOUT:
Serial.println(“Time out error”);
break;
default:
Serial.println(“Unknown error”);
break;
}//读取模块状态
Serial.print(“Humidity (%): “);
Serial.println((float)DHT11.humidity, 2);
Serial.print(“Temperature (oC): “);
Serial.println((float)DHT11.temperature, 2);
Serial.print(“Temperature (oF): “);
Serial.println(Fahrenheit(DHT11.temperature), 2);
Serial.print(“Temperature (K): “);
Serial.println(Kelvin(DHT11.temperature), 2);
Serial.print(“Dew Point (oC): “);
Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));
Serial.print(“DewPointFast (oC): “);
Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));//串口输出函数
//**************************I2C1602显示屏温度显示部分**************************
lcd.init();
lcd.backlight();
lcd.print(“wendu:”);
lcd.print((float)DHT11.temperature,2);
lcd.println(“C    “);
//温度的单位参数
lcd.setCursor(0,1);
lcd.print(“shidu:”);
lcd.print((float)DHT11.humidity,2);
lcd.println(“%RH  “);//%RH湿度的单位参数

//**************************ISD1820录放音模块部分**************************
if(DHT11.temperature>30)
digitalWrite(PE,HIGH);
k++;
if(k==100000)//k+1直到计到100000.
{
digitalWrite(PE,LOW);
k=1;
}
lcd.init();
lcd.backlight();
lcd.print(“wendu:”);
lcd.print((float)DHT11.temperature,2);
lcd.println(“C    “);

//温度的单位参数
lcd.setCursor(0,1);
lcd.print(“shidu:”);
lcd.print((float)DHT11.humidity,2);
lcd.println(“%RH  “);//%RH湿度的单位参数
}