| 70 | |
| 71 | |
| 72 | int AM232X::read() |
| 73 | { |
| 74 | if (millis() - _lastRead < _readDelay) |
| 75 | { |
| 76 | return AM232X_READ_TOO_FAST; |
| 77 | } |
| 78 | _lastRead = millis(); |
| 79 | |
| 80 | // READ HUMIDITY AND TEMPERATURE REGISTERS |
| 81 | int rv = _readRegister(0x00, 4); |
| 82 | if (rv < 0) return rv; |
| 83 | |
| 84 | if (rv != AM232X_OK) |
| 85 | { |
| 86 | if (_suppressError == false) |
| 87 | { |
| 88 | _humidity = AM232X_INVALID_VALUE; |
| 89 | _temperature = AM232X_INVALID_VALUE; |
| 90 | } |
| 91 | return rv; // propagate error value |
| 92 | } |
| 93 | |
| 94 | // EXTRACT HUMIDITY AND TEMPERATURE |
| 95 | _humidity = (_bits[2] * 256 + _bits[3]) * 0.1; |
| 96 | int16_t t = ((_bits[4] & 0x7F) * 256 + _bits[5]); |
| 97 | if (t == 0) |
| 98 | { |
| 99 | _temperature = 0.0; // prevent -0.0; |
| 100 | } |
| 101 | else |
| 102 | { |
| 103 | _temperature = t * 0.1; |
| 104 | if ((_bits[4] & 0x80) == 0x80 ) |
| 105 | { |
| 106 | _temperature = -_temperature; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | #ifdef AM232X_VALUE_OUT_OF_RANGE |
| 111 | // TEST OUT OF RANGE |
| 112 | if (_humidity > 100) |
| 113 | { |
| 114 | return AM232X_HUMIDITY_OUT_OF_RANGE; |
| 115 | } |
| 116 | if ((_temperature < -40) || (_temperature > 80)) |
| 117 | { |
| 118 | return AM232X_TEMPERATURE_OUT_OF_RANGE; |
| 119 | } |
| 120 | #endif |
| 121 | |
| 122 | return AM232X_OK; |
| 123 | } |
| 124 | |
| 125 | |
| 126 | float AM232X::getHumidity() |