def __init__(self,
ccs811_address=0x5b,
bme280_address=0x77,
tmp117_address=0x48,
ccs811_n_samples=1):
self.lock = _thread.allocate_lock()
self.ccs811_n_samples = ccs811_n_samples
self.ccs811 = qwiic_ccs811.QwiicCcs811(address=ccs811_address)
self.bme280 = qwiic_bme280.QwiicBme280(address=bme280_address)
self.tmp117 = qwiic_tmp117.QwiicTmp117(address=tmp117_address)
self.ccs811.begin()
self.bme280.begin()
self.tmp117.begin()
# The conversion and averaging affect who long we will have to wait
# for a conversion. See the TMP117 data sheet.
self.tmp117.set_avg(qwiic_tmp117.QwiicTmp117.CONV_AVG_8)
self.tmp117.set_cycle(qwiic_tmp117.QwiicTmp117.CONV_CYCLE_2)
self.tvoc_q = []
self.eco2_q = []
self.pres_q = []
self.tdry_q = []
self.rh_q = []
_thread.start_new_thread(self.read_loop, (None, ))
# Sleep so that the measure thread can start
time.sleep(1)
def __init__(self, title, co2_tvoc="co2"):
self.title = title
self.co2_tvoc = co2_tvoc
logging.debug(self.title + ' init started')
self.sensor = qwiic_ccs811.QwiicCcs811()
self.sensor.begin()
def runSensors():
myBME280 = qwiic_bme280.QwiicBme280()
myCCS811 = qwiic_ccs811.QwiicCcs811()
if my BME280.is_connected() == False:
print("The Qwiic BME280 device isn't connected to the system. Please check your connection", \
file=sys.stderr)
return
def initCCS811(self):
try:
self.ccs811 = qwiic_ccs811.QwiicCcs811(address=0x5a)
if self.ccs811.is_connected() == False:
raise "Sensor not connected"
self.ccs811.begin()
except Exception as e:
print("error establishing ccs811",str(e))
def __init__(self):
self.sensor = qwiic_ccs811.QwiicCcs811()
if self.sensor.is_connected() == False:
print(
"CCS811 Sensor isn't connected to the system. Please check your connection",
file=sys.stderr)
sys.exit(0)
else:
print("CCS811 Sensor start")
self.sensor.begin()
def create_ccs811(verbose=False):
""" Return a ccs811 object to access this sensor. Raises an error if it cannot connect. """
new_ccs811 = qwiic_ccs811.QwiicCcs811() #i2c_driver = i2c_bus)
new_ccs811.begin()
if not new_ccs811.connected:
raise Exception(f"Cannot connect to ccs811 on i2c_bus {i2c_bus}")
# Mode 1 = read every 1s, constant heat (more accurate?)
# Mode 2 = every 10s, pulse heat
# Mode 3 = every 60s, pulse heat
#new_ccs811.set_drive_mode (1)
new_ccs811.set_drive_mode(2)
return new_ccs811
def runExample():
print("\nSparkFun CCS811 Sensor Example 3 - NTC data to CCS811 for compensation. \n")
mySensor = qwiic_ccs811.QwiicCcs811()
if mySensor.connected == False:
print("The Qwiic CCS811 device isn't connected to the system. Please check your connection", \
file=sys.stderr)
return
mySensor.begin()
mySensor.referance_resistance = 9950
while True:
if mySensor.data_available():
mySensor.read_algorithm_results()
print("CO2:\t%.3f ppm" % mySensor.CO2)
print("tVOC:\t%.3f ppb" % mySensor.TVOC)
mySensor.read_ntc()
print("Measured Resistance: %.3f ohms" % mySensor.resistance)
readTemperature = mySensor.temperature
print("Converted Temperature: %.2f deg C" % readTemperature)
mySensor.set_environmental_data( 50, readTemperature)
elif mySensor.check_status_error():
error = mySensor.get_error_register();
if error == 0xFF:
# communication error
print("Failed to get Error ID register from sensor")
else:
strErr = "Unknown Error"
for code in _deviceErrors.keys():
if error & code:
strErr = _deviceErrors[code]
break
print("Device Error: %s" % strErr)
time.sleep(1)
def runExample():
print(
"\nSparkFun CCS811 Sensor Example 3 - NTC data to CCS811 for compensation. \n"
)
mySensor = qwiic_ccs811.QwiicCcs811()
if mySensor.connected == False:
print("The Qwiic CCS811 device isn't connected to the system. Please check your connection", \
file=sys.stderr)
return
mySensor.begin()
while True:
humidityVariable = random.randrange(0, 10000) / 100 # 0 to 100%
temperatureVariable = random.randrange(500, 7000) / 100 #5C to 70C
print("New humidity and temperature:")
print(" Humidity: %.2f percent relative" % humidityVariable)
print(" Temperature: %.2f degrees C" % temperatureVariable)
mySensor.set_environmental_data(humidityVariable, temperatureVariable)
if mySensor.data_available():
mySensor.read_algorithm_results()
print(" CO2:\t%.3f ppm" % mySensor.CO2)
print(" tVOC:\t%.3f ppb\n" % mySensor.TVOC)
elif mySensor.check_status_error():
error = mySensor.get_error_register()
if error == 0xFF:
# communication error
print("Failed to get Error ID register from sensor")
else:
strErr = "Unknown Error"
for code in _deviceErrors.keys():
if error & code:
strErr = _deviceErrors[code]
break
print("Device Error: %s" % strErr)
time.sleep(1)
def runExample():
mySensor = qwiic_ccs811.QwiicCcs811()
if mySensor.connected == False:
print("The Qwiic CCS811 device isn't connected to the system. Please check your connection", \
file=sys.stderr)
return
mySensor.begin()
mySensor.read_algorithm_results()
time.sleep(3)
mySensor.read_algorithm_results()
time.sleep(3)
mySensor.read_algorithm_results()
print(datetime.datetime.now().strftime("%Y-%m-%dT%H:%M:%S"),end=",")
print("%.3f" % mySensor.CO2,end = ",")
print("%.3f" % mySensor.TVOC)
def runExample():
print("\nSparkFun CCS811 Sensor Basic Example \n")
mySensor = qwiic_ccs811.QwiicCcs811()
if mySensor.connected == False:
print("The Qwiic CCS811 device isn't connected to the system. Please check your connection", \
file=sys.stderr)
return
mySensor.begin()
while True:
mySensor.read_algorithm_results()
print("CO2:\t%.3f" % mySensor.CO2)
print("tVOC:\t%.3f\n" % mySensor.TVOC)
time.sleep(1)
import os
import qwiic_ccs811
from time import sleep
from dbwriter import writeinflux
# Variables used and inputted into the fuctions
location = os.getenv("DEVICE_DB_LOCATION")
measurement_name = "ccs811"
# startup of sensor so it doesn't just write 0 values
# API Documentation @ https://qwiic-ccs811-py.readthedocs.io/en/latest/apiref.html
mySensor = qwiic_ccs811.QwiicCcs811()
mySensor.begin()
mySensor.read_algorithm_results()
sleep(30)
def convertdata():
# take the readings and store it on the board so it can be pulled
mySensor.read_algorithm_results()
# format the data as a single measurement for influx
co2_level = {
"measurement": measurement_name,
"tags": {
"location": location
},
"fields": {
"co2": float(mySensor.get_co2())
}
}
tvoc_level = {
print()
devices = qwiic.list_devices()
if len(devices) == 0:
print("No Devices Found!")
exit(1)
print("Found the following device(s):")
for device in devices:
print(device[1])
myJoystick = qwiic_joystick.QwiicJoystick()
bme280 = qwiic_bme280.QwiicBme280()
ccs811 = qwiic_ccs811.QwiicCcs811()
if myJoystick.connected == True:
useJoystick = True
myJoystick.begin()
if bme280.connected == True:
useBme280 = True
bme280.begin()
bme280.filter = 1 # 0 to 4 is valid. Filter coefficient. See 3.4.4
bme280.standby_time = 0 # 0 to 7 valid. Time between readings. See table 27.
bme280.over_sample = 1 # 0 to 16 are valid. 0 disables temp sensing. See table 24.
bme280.pressure_oversample = 1 # 0 to 16 are valid. 0 disables pressure sensing. See table 23.
bme280.humidity_oversample = 1 # 0 to 16 are valid. 0 disables humidity sensing. See table 19.
def main():
constants.hostname = socket.gethostname()
if ((len(constants.hostname) < 1)
or (constants.hostname == "undefined")):
print("could not determine hostname")
sys.exit()
os.chdir("/home/pi/Projects/sensor-box")
logger.logEvent("sensor-box.py started at " + str(datetime.datetime.now()))
# using CCS811 mode 1 for internal measurement every second
ccs811Sensor = qwiic_ccs811.QwiicCcs811()
bme280Sensor = qwiic_bme280.QwiicBme280()
if (HASPM25):
pm25Sensor = smbus.SMBus(1)
pm1count = -1
pm10count = -1
pm25count = -1
if (ccs811Sensor.connected == False) or (bme280Sensor.connected == False):
logger.logEvent("failed to connect to sensors")
sys.exit(-1)
ccs811Sensor.begin()
bme280Sensor.begin()
yesterday = 0
today = 1
baseValues = [ 0, 0, 0, 0, 0, 0]
baseValueSet = False
baseValue = 0
baseIndex = 0
config = constants.hostname + ".conf"
if (exists(config)):
with open(config) as c:
baseValue = int(c.read())
ccs811Sensor.set_baseline(baseValue)
baseValueSet = True
if (DEBUG):
print("read baseline from " + config)
while True:
today = time.localtime().tm_mday
if (yesterday != today):
if (DEBUG):
print("yesterday", yesterday, "not equal to today",today)
logger.logEvent("yesterday " + str(yesterday) + " not equal to today " + str(today))
uptime = os.popen('uptime -s').read() [:-1]
logger.logSensorHeader("#boot time " + uptime)
logger.logSensorHeader("time,temp,humid,CO2,tVOC,PM1.0,PM2.5,PM10.0")
logger.logEventHeader("#boot time " + uptime)
logger.logEventHeader("#description of event")
baseline = ccs811Sensor.get_baseline()
logger.logEvent("#baseline at day rollover " + str(baseline))
yesterday = today
if (baseline != baseValue) and (baseValueSet == True):
if (DEBUG):
logger.logEvent("#baseline " + str(baseline) + " does not match baseValue " + str(baseValue) + ", resetting")
ccs811Sensor.set_baseline(baseValue)
if (baseValueSet == False):
interval = 10
if ((time.localtime().tm_min % interval) == 0):
baseline = ccs811Sensor.get_baseline()
if (baseline >= constants.maxBaseline):
if (DEBUG):
logger.logEvent("baseline too high, using 0: " + str(baseline))
baseline = 0
if (DEBUG):
logger.logEvent("#baseline " + str(interval) + " min read " + str(baseline))
baseValues[baseIndex] = baseline
baseIndex +=1
logger.logEvent("#basevalues " + str(baseValues))
if (baseIndex == 6):
baseIndex = 0
if (checkBaseline(baseValues)):
logger.logEvent("#baseline set to " + str(baseline))
baseValue = baseline
ccs811Sensor.set_baseline(baseValue)
with open(config, 'w') as c:
c.write(str(baseValue))
baseValueSet = True
else:
interval = 10
if ((time.localtime().tm_min % interval) == 0):
baseline = ccs811Sensor.get_baseline()
if (DEBUG):
logger.logEvent("#baseline " + str(interval) + " min read " + str(baseline))
if (baseline != baseValue) and (baseValueSet == True):
if (DEBUG):
logger.logEvent("#baseline " + str(baseline) + " does not match baseValue " + str(baseValue) + ", resetting")
ccs811Sensor.set_baseline(baseValue)
humidity = bme280Sensor.humidity
if (HASPM25):
pm25Data = pm25Sensor.read_i2c_block_data(0x12, 0x00, 32)
pm1count = (pm25Data[4]<<8) + pm25Data[5]
pm10count = (pm25Data[8]<<8) + pm25Data[9]
pm25count = (pm25Data[6]<<8) + pm25Data[7]
tempCelsius = bme280Sensor.temperature_celsius
ccs811Sensor.set_environmental_data(humidity, tempCelsius)
#TODO my stretto reads 4C lower than the reported temperature
#tempCelsius -= 4
if ccs811Sensor.data_available():
ccs811Sensor.read_algorithm_results()
if (ccs811Sensor.CO2 > 2**14):
logString = '#error CO2 {:.2f}'.format(ccs811Sensor.CO2)
logger.logEvent(logString)
elif (ccs811Sensor.TVOC > 2**14):
logString = '#error tVOC {:.2f}'.format(ccs811Sensor.TVOC)
logger.logEvent(logString)
else:
logString = '{:.2f},{:.2f},{:d},{:d},{:d},{:d},{:d}'.format(
tempCelsius, humidity,
ccs811Sensor.CO2,
ccs811Sensor.TVOC,
pm1count, pm25count, pm10count)
logger.logSensor(logString)
if DEBUG:
print(logString)
time.sleep(60)