return values: DHTLIB_OK DHTLIB_ERROR_CHECKSUM DHTLIB_ERROR_TIMEOUT
| 63 | // DHTLIB_ERROR_CHECKSUM |
| 64 | // DHTLIB_ERROR_TIMEOUT |
| 65 | int DHT2pin::read() |
| 66 | { |
| 67 | // READ VALUES |
| 68 | int rv = _readSensor(DHTLIB_DHT_WAKEUP); |
| 69 | if (rv != DHTLIB_OK) |
| 70 | { |
| 71 | _humidity = DHTLIB_INVALID_VALUE; |
| 72 | _temperature = DHTLIB_INVALID_VALUE; |
| 73 | return rv; // propagate error value |
| 74 | } |
| 75 | |
| 76 | // CONVERT AND STORE |
| 77 | _humidity = word(_bits[0], _bits[1]) * 0.1; |
| 78 | _temperature = word(_bits[2] & 0x7F, _bits[3]) * 0.1; |
| 79 | if (_bits[2] & 0x80) // negative _temperature |
| 80 | { |
| 81 | _temperature = -_temperature; |
| 82 | } |
| 83 | |
| 84 | // TEST CHECKSUM |
| 85 | uint8_t sum = _bits[0] + _bits[1] + _bits[2] + _bits[3]; |
| 86 | if (_bits[4] != sum) |
| 87 | { |
| 88 | return DHTLIB_ERROR_CHECKSUM; |
| 89 | } |
| 90 | return DHTLIB_OK; |
| 91 | } |
| 92 | |
| 93 | |
| 94 | float DHT2pin::temperature() |