온도와 습도를 검출할 수 있는 센서로 우수한 품질, 빠른 응답, 저항 방지 기능을 갖추고 있으며
저렴한 비용으로 높은 성능을 보여줍니다.




· 인터페이스 : 디지털
· 공급 전원 : 5V
· 온도범위 : 0 - 50℃ (±2℃ 오차)
· 습도 : 20 - 90% 상대습도 (±5℃오차)




☞ 아날로그 PIN 0를 이용한 예제코드.




#define dht11_pin 14 //Analog port 0 on Arduino Uno
//#define dht11_pin 54 //Analog port 0 on Arduino Mega2560
byte read_dht11_dat()
{
byte i = 0;
byte result=0;
for(i=0; i< 8; i++)
{
while (!digitalRead(dht11_pin));
delayMicroseconds(30);
if (digitalRead(dht11_pin) != 0 )
bitSet(result, 7-i);
while (digitalRead(dht11_pin));
}
return result;
}
void setup()
{
pinMode(dht11_pin, OUTPUT);
digitalWrite(dht11_pin, HIGH);
Serial.begin(9600);
Serial.println("Ready");
}
void loop()
{
byte dht11_dat[5];
byte dht11_in;
byte i;// start condition
digitalWrite(dht11_pin, LOW);
delay(18);
digitalWrite(dht11_pin, HIGH);
delayMicroseconds(1);
pinMode(dht11_pin, INPUT);
delayMicroseconds(40);
if (digitalRead(dht11_pin))
{
Serial.println("dht11 start condition 1 not met"); // wait for DHT response signal: LOW
delay(1000);
return;
}
delayMicroseconds(80);
if (!digitalRead(dht11_pin))
{
Serial.println("dht11 start condition 2 not met"); //wair for second response signal:HIGH
return;
}
delayMicroseconds(80);// now ready for data reception
for (i=0; i<5; i++)
{ dht11_dat[i] = read_dht11_dat();} //recieved 40 bits data. Details are described in datasheet
pinMode(dht11_pin, OUTPUT);
digitalWrite(dht11_pin, HIGH);
byte dht11_check_sum = dht11_dat[0]+dht11_dat[2];// check check_sum
if(dht11_dat[4]!= dht11_check_sum)
{
Serial.println("DHT11 checksum error");
}
Serial.print("Current humdity = ");
Serial.print(dht11_dat[0], DEC);
Serial.print("% ");
Serial.print("temperature = ");
Serial.print(dht11_dat[2], DEC);
Serial.println("C ");
delay(2000); //fresh time
}