C++ (Cpp) _readSensor Examples

Example #1

// return values:
// DHTLIB_OK
// DHTLIB_ERROR_CHECKSUM
// DHTLIB_ERROR_TIMEOUT
int DHT2pin::read()
{
    // READ VALUES
    int rv = _readSensor(DHTLIB_DHT_WAKEUP);
    if (rv != DHTLIB_OK)
    {
        humidity    = DHTLIB_INVALID_VALUE;  // invalid value, or is NaN prefered?
        temperature = DHTLIB_INVALID_VALUE;  // invalid value
        return rv; // propagate error value
    }

    // CONVERT AND STORE
    humidity = word(bits[0], bits[1]) * 0.1;
    temperature = word(bits[2] & 0x7F, bits[3]) * 0.1;
    if (bits[2] & 0x80)  // negative temperature
    {
        temperature = -temperature;
    }

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

Example #2

File: dht.cpp Project: 07spider70/Arduino

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

    // 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;
    temperature = ((bits[2] & 0x7F)*256 + bits[3]) * 0.1;
    if (bits[2] & 0x80)  // negative temperature
    {
        temperature = -temperature;
    }

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

Example #3

File: dht.cpp Project: twinsenfan/ElectronicDesign

// return values:
// DHTLIB_OK
// DHTLIB_ERROR_CHECKSUM
// DHTLIB_ERROR_TIMEOUT
int dht::read11(uint8_t pin)
{
    // READ VALUES
    //if (_disableIRQ) noInterrupts();
    int rv = _readSensor(pin, 18);
    //if (_disableIRQ) interrupts();
    if (rv != 0)
    {
        //humidity    = DHTLIB_INVALID_VALUE; // invalid value, or is NaN prefered?
        temperature = -99; // invalid value
        return rv;
    }

    // CONVERT AND STORE
    //humidity = bits[0] + bits[1] * 0.1;
    temperature = (bits[2] & 0x7F) + bits[3] * 0.1;
    if (bits[2] & 0x80)  // negative temperature
    {
        temperature = -temperature;
    }

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

Example #4

// return values:
// DHTLIB_OK
// DHTLIB_ERROR_CHECKSUM
// DHTLIB_ERROR_TIMEOUT
int DHT2pin::read11()
{
    // READ VALUES
    int rv = _readSensor(DHTLIB_DHT11_WAKEUP);
    if (rv != DHTLIB_OK)
    {
        humidity    = DHTLIB_INVALID_VALUE; // invalid value, or is NaN prefered?
        temperature = DHTLIB_INVALID_VALUE; // invalid value
        return rv;
    }

    // CONVERT AND STORE
    humidity    = bits[0];  // bits[1] == 0;
    temperature = bits[2];  // bits[3] == 0;

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

    return DHTLIB_OK;
}

Example #5

File: dht.cpp Project: 07spider70/Arduino

int8_t dht::read11(uint8_t pin)
{
    // READ VALUES
    int8_t result = _readSensor(pin, DHTLIB_DHT11_WAKEUP, DHTLIB_DHT11_LEADING_ZEROS);

    // these bits are always zero, masking them reduces errors.
    bits[0] &= 0x7F;
    bits[2] &= 0x7F;

    // CONVERT AND STORE
    humidity    = bits[0];  // bits[1] == 0;
    temperature = bits[2];  // bits[3] == 0;

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