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如何同时用两个dht11测量出来的温度?

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发表于 2017-4-6 17:01:19 | 显示全部楼层 |阅读模式
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);
}
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发表于 2017-4-6 20:53:21 | 显示全部楼层
這是兩個 dht22 的,供你參考
  1. #include <LiquidCrystal.h>
  2. #include <DHT22.h>
  3. // Data wire is plugged into port 7 on the Arduino
  4. // Connect a 4.7K resistor between VCC and the data pin (strong pullup)
  5. #define DHT22_PIN_1 10
  6. #define DHT22_PIN_2 12
  7. LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
  8. //int pin=10;
  9. //int pin=12;
  10. // Setup a DHT22 instance
  11. DHT22 myDHT22_1(DHT22_PIN_1);
  12. DHT22 myDHT22_2(DHT22_PIN_2);

  13. void setup(void)
  14. {
  15.   lcd.clear();
  16.   lcd.begin(20, 4);
  17. }
  18. void loop(void)
  19. {
  20. //  lcd.clear();
  21.   DHT22_ERROR_t errorCode;
  22.   errorCode = myDHT22_1.readData();
  23.   switch(errorCode)
  24.   {
  25.   case DHT_ERROR_NONE:
  26.   lcd.setCursor(0,2);
  27.   lcd.print("T1=");
  28.   lcd.print(myDHT22_1.getTemperatureC());
  29.   lcd.print(char(223));
  30.   lcd.print("C");
  31.   lcd.setCursor(11,2);
  32.   lcd.print("H1=");
  33.   lcd.print(myDHT22_1.getHumidity());
  34.   lcd.print("% ");
  35.   
  36.   errorCode = myDHT22_2.readData();
  37. //  switch(errorCode)
  38. //  case DHT_ERROR_NONE:
  39.   lcd.setCursor(0,3);
  40.   lcd.print("T2=");
  41.   lcd.print(myDHT22_2.getTemperatureC());
  42.   lcd.print(char(223));
  43.   lcd.print("C");
  44.   lcd.setCursor(11,3);
  45.   lcd.print("H2=");
  46.   lcd.print(myDHT22_2.getHumidity());
  47.   lcd.print("% ");
  48.   
  49.   delay(500);      
  50.   }
  51. }
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