DHT11 Temperature and Humidity Sensor

DHT11 Temperature and Humidity Sensor.

The DHT11 sensor includes a resistive-type humidity measurement component, with an NTC temperature measurement component, and a high-performance 8-bit microcontroller inside, and provides calibrated digital signal output. It has high reliability and excellent long-term stability, thanks to the exclusive digital signal acquisition technique and temperature & humidity sensing technology.

Each DHT11 is strictly calibrated in the laboratory which is extremely accurate in humidity calibration. The calibration coefficients are stored as a program in the OTP memory, which is used by the sensor's internal signal detecting process. The single-wire serial interface makes system integration quick and easy. Its small size, low power consumption, and up-to-20 meter signal transmission make it the best choice for various applications, including those most demanding ones.

DHT11 Temperature and Humidity Sensor Specification:

Power Supply 3.3~5.5V DC
Output 3 pin single row
Measurement Range Humidity 20-90%RH Temperature 0~50
Accuracy Humidity +-5%RH Temperature +-2
Resolution Humidity 1%RH Temperature 1
Interchangeability Fully Interchangeable
Long-Term Stability <1%RH/year

Library: DHT.zip

Sketch

#include <dht.h>

#define dht_dpin A0 //no ; here. Set equal to channel sensor is on  dht DHT;  void setup(){  Serial.begin(9600);  delay(300);//Let system settle  Serial.println("Humidity and temperaturenn");  delay(700);//Wait rest of 1000ms recommended delay before  //accessing sensor }//end "setup()"  void loop(){  //This is the "heart" of the program.  DHT.read11(dht_dpin);   Serial.print("Current humidity = ");  Serial.print(DHT.humidity);  Serial.print("% ");  Serial.print("temperature = ");  Serial.print(DHT.temperature);   Serial.println("C ");  delay(800);//Don't try to access too frequently... in theory  //should be once per two seconds, fastest,  //but seems to work after 0.8 second. }// end loop()