def get_result_data(self, test):
"""Get the result data, convert to word and store in variables
Args:
None
Returns:
None
Raises:
None
"""
msgs = [CCS811_ALG_RESULT_DATA]
# self._i2c.msg_write(msgs, test)
msgs = self._i2c.msg_read(4, msgs, test)
if test:
for msg in msgs:
print("Msg: ")
for d in msg.data:
print("d: " + str(hex(d)))
self._eCO2 = bytesToWord(msgs[1].data[0], msgs[1].data[1])
# print "CO2", self._eCO2
self._TVOC = bytesToWord(msgs[1].data[2], msgs[1].data[3])
# print "TVOC", self._TVOC
return
def getChannels(self):
'''Reads two light channels and calculates visible spectrum
Args:
self:
Returns:
ir, full: infra-red and full spectrum reading
Raises:
None
'''
# Select control register, 0x00(00) with command register, 0x80(128)
# 0x03(03) Power ON mode
cmds = [ctrl | cmd, power_on]
self._i2c.msg_write(cmds)
cmds = [timing | cmd, nominal_integration]
self._i2c.msg_write(cmds)
# need a pause here between sending the request and getting the data
# print("Sleep")
time.sleep(0.05)
# Full Spectrum
# Read data back from 0x0C(12) with command register, 0x80(128), 2 bytes
# ch0 LSB, ch0 MSB
cmds = [cmd | 0x0C]
size = 2
ms2 = self._i2c.msg_read(size, cmds)
# ms2 = self._i2c.msg_read2(cmds, size)
# for ms in ms2:
# print('-')
# for dt in ms.data:
# print("Data " + str(dt))
full = bytesToWord(ms2[1].data[1], ms2[1].data[0])
# Infra-red band
# Read data back from 0x0E(14) with command register, 0x80(128), 2 bytes
# ch1 LSB, ch1 MSB
size = 2
# cmds = [cmd, 0x0E]
cmds = [cmd | 0x0E]
# cmds = [0x0E, cmd]
ms3 = self._i2c.msg_read(size, cmds)
# ms3 = self._i2c.msg_read2(cmds, size)
# for ms in ms3:
# print('-')
# for dt in ms.data:
# print("Data " + str(dt))
ir = bytesToWord(ms3[1].data[1], ms3[1].data[0])
if ir == None or full == None:
return None, None
else:
return ir, full
def get_tempC_prior(self):
"""Get the temperature from the prior humidity reading
Args:
None
Returns:
tempC: calculated temperature in Centigrade
Raises:
None
"""
print("\nGet Temp - get previous")
msgs = self._i2c.get_msg([previous_temp], 3)
if msgs == None:
return None
else:
value = bytesToWord(msgs[1].data[0], msgs[1].data[1])
tempC = self.calc_temp(value)
return tempC
def get_tempC(self):
"""Get the temperature (new reading)
Args:
None
Returns:
tempC: calculated temperature in Centigrade
Raises:
None
"""
# print "\nGet Temp - no hold split"
msgs = self._i2c.msg_write([temp_no_hold])
# need a pause here between sending the request and getting the data
time.sleep(0.03)
msgs = self._i2c.msg_read(3)
if msgs == None:
return None
else:
value = bytesToWord(msgs[0].data[0], msgs[0].data[1])
return self.calc_temp(value)
def get_humidity(self):
"""Get the humidity
Args:
None
Returns:
rh: calculated relative humidity
Raises:
None
"""
#print ("\nGet Humidity - no hold split")
msgs = self._i2c.msg_write([rh_no_hold])
# need a pause here between sending the request and getting the data
time.sleep(0.03)
msgs = self._i2c.msg_read(3)
if msgs == None:
return None
else:
value = bytesToWord(msgs[0].data[0], msgs[0].data[1])
rh = self.calc_humidity(value)
return rh
