def sample(self):
try:
I2C.start_tx(self.__addr)
temp_msb, temp_lsb, _, humid_msb, humid_lsb, _ = I2C.read_cmd16(
SHT31.__CMD_READ_SINGLE_HIGH, 6)
raw_humid = (humid_msb << 8) | humid_lsb
raw_temp = (temp_msb << 8) | temp_lsb
return SHTDatum(SHT31.humid(raw_humid), SHT31.temp(raw_temp))
finally:
I2C.end_tx()
def sample(self):
if self.__addr == 0:
return None
try:
I2C.start_tx(self.__addr)
temp_msb, temp_lsb, _, humid_msb, humid_lsb, _ = I2C.read_cmd16(SHT31.__CMD_READ_SINGLE_HIGH, 6,
wait=self.MEASUREMENT_DURATION)
raw_humid = (humid_msb << 8) | humid_lsb
raw_temp = (temp_msb << 8) | temp_lsb
return SHTDatum(SHT31.humid(raw_humid), SHT31.temp(raw_temp))
finally:
I2C.end_tx()
def construct_from_jdict(cls, jdict):
if not jdict:
return None
source = jdict.get('src')
rec = LocalizedDatetime.construct_from_jdict(jdict.get('rec'))
period = jdict.get('per')
pm1 = jdict.get('pm1')
pm2p5 = jdict.get('pm2p5')
pm10 = jdict.get('pm10')
bins = jdict.get('bin')
if bins is None:
print("OPCDatum incomplete: %s" % jdict, file=sys.stderr)
sys.stderr.flush()
return None
bin_1_mtof = jdict.get('mtf1')
bin_3_mtof = jdict.get('mtf3')
bin_5_mtof = jdict.get('mtf5')
bin_7_mtof = jdict.get('mtf7')
sfr = jdict.get('sfr')
sht = SHTDatum.construct_from_jdict(jdict.get('sht'))
return OPCDatum(source,
rec,
pm1,
pm2p5,
pm10,
period,
bins,
bin_1_mtof,
bin_3_mtof,
bin_5_mtof,
bin_7_mtof,
sfr=sfr,
sht=sht)
def null_datum(cls):
return SHTDatum(None, None)
#!/usr/bin/env python3 """ Created on 18 Sep 2016 @author: Bruno Beloff ([email protected]) """ from scs_core.climate.sht_datum import SHTDatum from scs_core.data.json import JSONify # -------------------------------------------------------------------------------------------------------------------- sht = SHTDatum(54.3, 23.4) print(sht) print("-") jstr = JSONify.dumps(sht) print(jstr) print("-")
def sample(self):
try:
self.obtain_lock()
self._spi.open()
# command...
self.__cmd(self.__CMD_READ_HISTOGRAM)
chars = self.__read_bytes(86)
# checksum...
required = Decode.unsigned_int(chars[84:86], '<')
actual = ModbusCRC.compute(chars[:84])
if required != actual:
raise ValueError(
"bad checksum: required: 0x%04x actual: 0x%04x" %
(required, actual))
# time...
rec = LocalizedDatetime.now()
# bins...
bins = [
Decode.unsigned_int(chars[i:i + 2], '<')
for i in range(0, 48, 2)
]
# bin MToFs...
bin_1_mtof = chars[48]
bin_3_mtof = chars[49]
bin_5_mtof = chars[50]
bin_7_mtof = chars[51]
# period...
raw_period = Decode.unsigned_int(chars[52:54], '<')
period = round(float(raw_period) / 100.0, 3)
# temperature & humidity
raw_temp = Decode.unsigned_int(chars[56:58], '<')
raw_humid = Decode.unsigned_int(chars[58:60], '<')
sht = SHTDatum(SHT31.humid(raw_humid), SHT31.temp(raw_temp))
# PMx...
try:
pm1 = Decode.float(chars[60:64], '<')
except TypeError:
pm1 = None
try:
pm2p5 = Decode.float(chars[64:68], '<')
except TypeError:
pm2p5 = None
try:
pm10 = Decode.float(chars[68:72], '<')
except TypeError:
pm10 = None
return OPCDatum(self.SOURCE, rec, pm1, pm2p5, pm10, period, bins,
bin_1_mtof, bin_3_mtof, bin_5_mtof, bin_7_mtof,
sht)
finally:
self._spi.close()
self.release_lock()