diff options
Diffstat (limited to 'src/home/temphum/i2c.py')
-rw-r--r-- | src/home/temphum/i2c.py | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/src/home/temphum/i2c.py b/src/home/temphum/i2c.py deleted file mode 100644 index 7d8e2e3..0000000 --- a/src/home/temphum/i2c.py +++ /dev/null @@ -1,52 +0,0 @@ -import abc -import smbus - -from .base import BaseSensor, SensorType - - -class I2CSensor(BaseSensor, abc.ABC): - def __init__(self, bus: int): - super().__init__() - self.bus = smbus.SMBus(bus) - - -class DHT12(I2CSensor): - i2c_addr = 0x5C - - def _measure(self): - raw = self.bus.read_i2c_block_data(self.i2c_addr, 0, 5) - if (raw[0] + raw[1] + raw[2] + raw[3]) & 0xff != raw[4]: - raise ValueError("checksum error") - return raw - - def temperature(self) -> float: - raw = self._measure() - temp = raw[2] + (raw[3] & 0x7f) * 0.1 - if raw[3] & 0x80: - temp *= -1 - return temp - - def humidity(self) -> float: - raw = self._measure() - return raw[0] + raw[1] * 0.1 - - -class Si7021(I2CSensor): - i2c_addr = 0x40 - - def temperature(self) -> float: - raw = self.bus.read_i2c_block_data(self.i2c_addr, 0xE3, 2) - return 175.72 * (raw[0] << 8 | raw[1]) / 65536.0 - 46.85 - - def humidity(self) -> float: - raw = self.bus.read_i2c_block_data(self.i2c_addr, 0xE5, 2) - return 125.0 * (raw[0] << 8 | raw[1]) / 65536.0 - 6.0 - - -def create_sensor(type: SensorType, bus: int) -> BaseSensor: - if type == SensorType.Si7021: - return Si7021(bus) - elif type == SensorType.DHT12: - return DHT12(bus) - else: - raise ValueError('unexpected sensor type') |