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风一样的男子 发表于 2017-4-6 17:01:19

如何同时用两个dht11测量出来的温度？

本帖最后由 风一样的男子 于 2017-4-6 17:04 编辑

这是一个dht11测量温度并读取出来的程序，求大神指导怎么用两个dht11测量不同物体温度并读出来
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>

dht11 DHT11;

#define DHT11PIN 2

void setup()
{
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));

delay(2000);
}

galaxy 发表于 2017-4-6 20:53:21

這是兩個 dht22 的,供你參考#include <LiquidCrystal.h>
#include <DHT22.h>
// Data wire is plugged into port 7 on the Arduino
// Connect a 4.7K resistor between VCC and the data pin (strong pullup)
#define DHT22_PIN_1 10
#define DHT22_PIN_2 12
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
//int pin=10;
//int pin=12;
// Setup a DHT22 instance
DHT22 myDHT22_1(DHT22_PIN_1);
DHT22 myDHT22_2(DHT22_PIN_2);

void setup(void)
{
lcd.clear();
lcd.begin(20, 4);
}
void loop(void)
{
//lcd.clear();
DHT22_ERROR_t errorCode;
errorCode = myDHT22_1.readData();
switch(errorCode)
{
case DHT_ERROR_NONE:
lcd.setCursor(0,2);
lcd.print("T1=");
lcd.print(myDHT22_1.getTemperatureC());
lcd.print(char(223));
lcd.print("C");
lcd.setCursor(11,2);
lcd.print("H1=");
lcd.print(myDHT22_1.getHumidity());
lcd.print("% ");

errorCode = myDHT22_2.readData();
//switch(errorCode)
//case DHT_ERROR_NONE:
lcd.setCursor(0,3);
lcd.print("T2=");
lcd.print(myDHT22_2.getTemperatureC());
lcd.print(char(223));
lcd.print("C");
lcd.setCursor(11,3);
lcd.print("H2=");
lcd.print(myDHT22_2.getHumidity());
lcd.print("% ");

delay(500);      
}
}

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