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DHT11

DHT11 - Miscellaneous
Brand: Various
Product Code: AC-1140
Availability: In Stock
Price: 3,95€
Incl. 0,63€ VAT excl. shipping costs
Qty:        

DHT11

    • Supply voltage: 3.3 ~ 5.5V DC
    • Output: single-bus digital signal
    • Measuring range: Humidity 20-90% RH, Temperature 0 ~ 50 ℃
    • Accuracy: Humidity + -5% RH, temperature + -2 ℃
    • Resolution: Humidity 1% RH, temperature 1 ℃
    • Long-term stability: <± 1% RH / Year

     

    Code Sample:

    int DHpin = 8;
    byte dat [5];
    byte read_data () {
    byte data;for (int i = 0; i < 8; i ++) {if (digitalRead (DHpin) == LOW) {while (digitalRead (DHpin) == LOW); // wait for 50us
    delayMicroseconds (30); // determine the duration of the high level to determine the data is '0 'or '1'if (digitalRead (DHpin) == HIGH)
    data |= (1 << (7-i)); // high front and low in the postwhile (digitalRead (DHpin) == HIGH); // data '1 ', wait for the next one receiver}}return data;}
     
    void start_test () {
    digitalWrite (DHpin, LOW); // bus down, send start signal
    delay (30); // delay greater than 18ms, so DHT11 start signal can be detected
     
    digitalWrite (DHpin, HIGH);
    delayMicroseconds (40); // Wait for DHT11 response
     
    pinMode (DHpin, INPUT);while (digitalRead (DHpin) == HIGH);
    delayMicroseconds (80); // DHT11 response, pulled the bus 80usif (digitalRead (DHpin) == LOW);
    delayMicroseconds (80); // DHT11 80us after the bus pulled to start sending data
     
    for (int i = 0; i < 4; i ++) // receive temperature and humidity data, the parity bit is not considered
    dat[i] = read_data ();
     
    pinMode (DHpin, OUTPUT);
    digitalWrite (DHpin, HIGH); // send data once after releasing the bus, wait for the host to open the next Start signal}
     
    void setup () {
    Serial.begin (9600);
    pinMode (DHpin, OUTPUT);}
     
    void loop () {
    start_test ();
    Serial.print ("Current humdity =");
    Serial.print (dat [0], DEC); // display the humidity-bit integer;
    Serial.print ('.');
    Serial.print (dat [1], DEC); // display the humidity decimal places;
    Serial.println ('%');
    Serial.print ("Current temperature =");
    Serial.print (dat [2], DEC); // display the temperature of integer bits;
    Serial.print ('.');
    Serial.print (dat [3], DEC); // display the temperature of decimal places;
    Serial.println ('C');
    delay (700);}

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