本帖最后由 ruson 于 2015-6-20 23:27 编辑
机智云的arduino底板，采集DHT11温湿度传感器（机智云的功能板上D3脚，连接至7脚）数据，并在1602上显示。程序如下：
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;
}
#include <dht11.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2); //定义脚位
dht11 DHT11;
#define DHT11PIN 7
void setup()
{
lcd.begin(16,2); //设置LCD显示的数目。16 X 2：16格2行。
lcd.print(" Hello,21IC!"); //将Hello,21IC!显示在LCD上
delay(5000);
Serial.begin(9600);
Serial.println("DHT11 TEST PROGRAM ");
Serial.print("LIBRARY VERSION: ");
Serial.println(DHT11LIB_VERSION);
Serial.println();
}
void loop()
{
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;
}
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("Dew PointFast (oC): ");
Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));
lcd.setCursor(0,0); //将闪烁的光标设置到column 0, line 1 (注释：从0开始数起，line 0是显示第一行，line 1是第二行。)
lcd.print("Temp is ");
lcd.print((float)DHT11.temperature, 2);
lcd.print(" ");
lcd.print((char)0xDF);
lcd.print("C");
lcd.setCursor(0,1); //将闪烁的光标设置到column 0, line 1 (注释：从0开始数起，line 0是显示第一行，line 1是第二行。)
lcd.print("Humi is ");
lcd.print((float)DHT11.humidity, 2);
lcd.print(" ");
lcd.print("%");
delay(1000);
}
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