def sample(self):
r = self.__read(self.__CMD_READ_MEASURED_VALUES, 0, 60)
# density...
pm1 = Decode.float(r[0:4], '>')
pm2p5 = Decode.float(r[4:8], '>')
pm4 = Decode.float(r[8:12], '>')
pm10 = Decode.float(r[12:16], '>')
# count...
pm0p5_count = Decode.float(r[16:20], '>')
pm1_count = Decode.float(r[20:24], '>')
pm2p5_count = Decode.float(r[24:28], '>')
pm4_count = Decode.float(r[28:32], '>')
pm10_count = Decode.float(r[32:36], '>')
# typical size...
tps = Decode.float(r[36:40], '>')
# time...
rec = LocalizedDatetime.now()
# report...
counts = SPSDatumCounts(pm0p5_count, pm1_count, pm2p5_count, pm4_count,
pm10_count)
return SPSDatum(self.SOURCE, rec, pm1, pm2p5, pm4, pm10, counts, tps)
def sample(self):
try:
self.obtain_lock()
self._spi.open()
# command...
self.__cmd(self.__CMD_READ_HISTOGRAM)
chars = self.__read_bytes(62)
# time...
rec = LocalizedDatetime.now()
# bins...
bins = [Decode.unsigned_int(chars[i:i + 2], '<') for i in range(0, 32, 2)]
# bin MToFs...
bin_1_mtof = chars[32]
bin_3_mtof = chars[33]
bin_5_mtof = chars[34]
bin_7_mtof = chars[35]
# period...
period = Decode.float(chars[44:48], '<')
# checksum...
required = Decode.unsigned_int(chars[48:50], '<')
actual = sum(bins) % 65536
if required != actual:
raise ValueError("bad checksum: required: 0x%04x actual: 0x%04x" % (required, actual))
# PMx...
try:
pm1 = Decode.float(chars[50:54], '<')
except TypeError:
pm1 = None
try:
pm2p5 = Decode.float(chars[54:58], '<')
except TypeError:
pm2p5 = None
try:
pm10 = Decode.float(chars[58:62], '<')
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)
finally:
self._spi.close()
self.release_lock()
def sample(self):
try:
self.obtain_lock()
cmd = SPINDIRx1Cmd.find('sg')
response = self._transact(cmd)
cnc = Decode.float(response[0:4], '<')
cnc_igl = Decode.float(response[4:8], '<')
temp = Decode.float(response[8:12], '<')
return NDIRDatum(temp, cnc, cnc_igl)
finally:
self.release_lock()
def measure_voltage(self):
try:
self.obtain_lock()
cmd = SPINDIRx1Cmd.find('mv')
response = self._transact(cmd)
pile_ref_voltage = Decode.float(response[0:4], '<')
pile_act_voltage = Decode.float(response[4:8], '<')
thermistor_voltage = Decode.float(response[8:12], '<')
return pile_ref_voltage, pile_act_voltage, thermistor_voltage
finally:
self.release_lock()
def status(self):
try:
self.obtain_lock()
# restart status...
cmd = SPINDIRx1Cmd.find('ws')
response = self._transact(cmd)
watchdog_reset = bool(response)
# input voltage...
cmd = SPINDIRx1Cmd.find('iv')
response = self._transact(cmd)
pwr_in = Decode.float(response, '<')
# uptime...
cmd = SPINDIRx1Cmd.find('up')
response = self._transact(cmd)
seconds = Decode.unsigned_long(response, '<')
status = NDIRStatus(watchdog_reset, pwr_in, NDIRUptime(seconds))
return status
finally:
self.release_lock()
def get_sample_voltage(self):
try:
self.obtain_lock()
# report...
cmd = SPINDIRt1f1Cmd.find('sv')
response = self._transact(cmd)
pile_ref_amplitude = Decode.float(response[0:4], '<')
pile_act_amplitude = Decode.float(response[4:8], '<')
thermistor_average = Decode.float(response[8:12], '<')
return pile_ref_amplitude, pile_act_amplitude, thermistor_average
finally:
self.release_lock()
def _calib_r_float(self, block, index):
cmd = SPINDIRx1Cmd.find('cr')
cmd.return_count = 4
response = self._transact(cmd, (block, index))
value = Decode.float(response, '<')
return value
def __read_float(self):
read_bytes = []
for _ in range(4):
time.sleep(OPCN2.__TRANSFER_DELAY)
read_bytes.extend(self.__spi.read_bytes(1))
return Decode.float(read_bytes)
def input_voltage(self):
try:
self.obtain_lock()
cmd = SPINDIRx1Cmd.find('iv')
response = self._transact(cmd)
v_in_voltage = Decode.float(response, '<')
return v_in_voltage
finally:
self.release_lock()
def pressure(self):
try:
self.obtain_lock()
cmd = SPINDIRx1Cmd.find('sp')
response = self._transact(cmd)
p_a = Decode.float(response[0:4], '<')
return round(p_a, 1)
finally:
self.release_lock()
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()
