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from .base import I2CTempHumSensor
class DHT12(I2CTempHumSensor):
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
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