Method read

libraries/DHTlib/dht.cpp:133–191

int8_t dht::read(uint8_t pin)
{
    // READ VALUES
    if (_disableIRQ) noInterrupts();
    int8_t result = _readSensor(pin, DHTLIB_DHT_WAKEUP, DHTLIB_DHT_LEADING_ZEROS);
    if (_disableIRQ) interrupts();

    // these bits are always zero, masking them reduces errors.
    bits[0] &= 0x03;
    bits[2] &= 0x83;

    // CONVERT AND STORE
    humidity  = (bits[0] * 256 + bits[1]) * 0.1;
    int16_t t = ((bits[2] & 0x7F) * 256 + bits[3]);
    if (t == 0)
    {
      temperature = 0.0;     // prevent -0.0;
    }
    else
    {
      temperature = t * 0.1;
      if((bits[2] & 0x80) == 0x80 )
      {
        temperature = -temperature;
      }
    }

    // HEXDUMP DEBUG
    /*
    Serial.println();
    // CHECKSUM
    if (_bits[4] < 0x10) Serial.print(0);
    Serial.print(_bits[4], HEX);
    Serial.print("    ");
    // TEMPERATURE
    if (_bits[2] < 0x10) Serial.print(0);
    Serial.print(_bits[2], HEX);
    if (_bits[3] < 0x10) Serial.print(0);
    Serial.print(_bits[3], HEX);
    Serial.print("    ");
    Serial.print(temperature, 1);
    Serial.print("    ");
    // HUMIDITY
    if (_bits[0] < 0x10) Serial.print(0);
    Serial.print(_bits[0], HEX);
    if (_bits[1] < 0x10) Serial.print(0);
    Serial.print(_bits[1], HEX);
    Serial.print("    ");
    Serial.print(humidity, 1);
    */

    // TEST CHECKSUM
    uint8_t sum = bits[0] + bits[1] + bits[2] + bits[3];
    if (bits[4] != sum)
    {
        return DHTLIB_ERROR_CHECKSUM;
    }
    return result;