def get_humidity(self):
"""Reads the humidity from the sensor. This call blocks
for 250ms to allow the sensor to return the data"""
self.transaction(
writing_bytes(self._I2C_ADDRESS, self._CMD_HUMIDITY_NO_HOLD))
time.sleep(0.250)
data = self.transaction(reading(self._I2C_ADDRESS, 3))[0]
if _calculate_checksum(data, 2) != data[2]:
raise ChecksumFailedError("Humidity checksum failed.")
else:
return _get_humidity_from_buffer(data)
def get_humidity(self):
"""Reads the humidity from the sensor. This call blocks
for 250ms to allow the sensor to return the data"""
self.transaction(
writing_bytes(self._I2C_ADDRESS,
self._CMD_HUMIDITY_NO_HOLD))
time.sleep(0.250)
data = self.transaction(reading(self._I2C_ADDRESS, 3))[0]
if _calculate_checksum(data, 2) != data[2]:
raise ChecksumFailedError("Humidity checksum failed.")
else:
return _get_humidity_from_buffer(data)
def get_temperature(self):
"""Reads the temperature from the sensor. This call blocks
for 250ms to allow the sensor to return the data.
"""
self.transaction(
writing_bytes(self._I2C_ADDRESS, self._CMD_TEMPERATURE_NO_HOLD))
time.sleep(0.250)
data = self.transaction(reading(self._I2C_ADDRESS, 3))[0]
if _calculate_checksum(data, 2) != data[2]:
raise ChecksumFailedError("Temperature checksum failed.")
else:
return _get_temperature_from_buffer(data)
def get_temperature(self):
"""Reads the temperature from the sensor. This call blocks
for 250ms to allow the sensor to return the data.
"""
self.transaction(
writing_bytes(self._I2C_ADDRESS,
self._CMD_TEMPERATURE_NO_HOLD))
time.sleep(0.250)
data = self.transaction(reading(self._I2C_ADDRESS, 3))[0]
if _calculate_checksum(data, 2) != data[2]:
raise ChecksumFailedError("Temperature checksum failed.")
else:
return _get_temperature_from_buffer(data)
def set(self, v):
self.i2c_master.transaction(
writing_bytes(self.device_address, self.register_address, v))
def reset(self):
"""Resets the SHT12."""
self.transaction(
writing_bytes(self._I2C_ADDRESS, self._CMD_SOFTRESET))
time.sleep(0.050)
def send_data(self, *data):
# co = 0
# dc = 1
# control = (co << 7) | (dc << 6)
control = 0x40
self.transaction(writing_bytes(I2C_ADDR, control, *data))
def send_command(self, *cmd):
# co = 0
# dc = 0
# control = (co << 7) | (dc << 6)
control = 0x00
self.transaction(writing_bytes(I2C_ADDR, control, *cmd))
def reset(self):
"""Resets the SHT12."""
self.transaction(writing_bytes(self._I2C_ADDRESS, self._CMD_SOFTRESET))
time.sleep(0.050)
def _send_data(self, *cmd):
# co = 0
# dc = 1
# control = (co << 7) | (dc << 6)
control = 0x40
self.transaction(writing_bytes(I2C_ADDR, control, *cmd))
def _send_command(self, *cmd):
# co = 0
# dc = 0
# control = (co << 7) | (dc << 6)
control = 0x00
self.transaction(writing_bytes(I2C_ADDR, control, *cmd))
