器材：arduino uno + 舵機 + dht11 + 杜邦線 + usb + 面包板
第一步：dht11測量 溫濕度
貼代碼：
double Fahrenheit(double celsius)
{
return 1.8 * celsius + 32;
} ? ?//攝氏溫度度轉化為華氏溫度
double Kelvin(double celsius)
{
return celsius + 273.15;
} ? ? //攝氏溫度轉化為開氏溫度
//露點（點在此溫度時，空氣飽和并產生露珠）
//參考: 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);
}
//快速計算露點，速度是5倍dewPoint()
//參考: 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 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.print((float)DHT11.temperature, 2);
Serial.println((float)DHT11.humidity, 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);
}
注明代碼出處：http://www.arduino.cn/thread-1429-1-2.html
第二步：可以通過ArduBlock可視化編程 控制舵機運動
自己改過后的代碼：
double Fahrenheit(double celsius)
{
return 1.8 * celsius + 32;
} ? ?//攝氏溫度度轉化為華氏溫度
double Kelvin(double celsius)
{
return celsius + 273.15;
} ? ? //攝氏溫度轉化為開氏溫度
//露點（點在此溫度時，空氣飽和并產生露珠）
//參考: 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);
}
//快速計算露點，速度是5倍dewPoint()
//參考: 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
#include
dht11 DHT11;
#define DHT11PIN 2
Servo servo_pin_3;
void setup()
{
Serial.begin(9600);
Serial.println("DHT11 TEST PROGRAM ");
Serial.print("LIBRARY VERSION: ");
Serial.println(DHT11LIB_VERSION);
Serial.println();
servo_pin_3.attach(3);
}
void loop()
{
static int a=0;
int chk = DHT11.read(DHT11PIN);
Serial.println((float)DHT11.temperature, 2);
Serial.println((float)DHT11.humidity, 2);
if((float)DHT11.temperature>18)
{
servo_pin_3.write( a );
a+=20;
}
delay(1000);
}
這是我改過之后的代碼可以在串口監視器看到溫濕度讓后用溫度大于18度讓舵機運動。
轉載注明出處。
