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()
