# Parse command line parameters.
sensor_args = { '11': Hema_DHT.DHT11,
'22': Hema_DHT.DHT22,
'2302': Hema_DHT.AM2302 }
if len(sys.argv) == 3 and sys.argv[1] in sensor_args:
sensor = sensor_args[sys.argv[1]]
pin = sys.argv[2]
else:
print 'usage: sudo ./Hema_DHT.py [11|22|2302] GPIOpin#'
print 'example: sudo ./Hema_DHT.py 2302 4 - Read from an AM2302 connected to GPIO #4'
sys.exit(1)
# Try to grab a sensor reading. Use the read_retry method which will retry up
# to 15 times to get a sensor reading (waiting 2 seconds between each retry).
humidity, temperature = Hema_DHT.read_retry(sensor, pin)
# Un-comment the line below to convert the temperature to Fahrenheit.
# temperature = temperature * 9/5.0 + 32
# Note that sometimes you won't get a reading and
# the results will be null (because Linux can't
# guarantee the timing of calls to read the sensor).
# If this happens try again!
if humidity is not None and temperature is not None:
print 'Temp={0:0.1f}* Humidity={1:0.1f}%'.format(temperature, humidity)
else:
print 'Failed to get reading. Try again!'
sys.exit(1)
# Parse command line parameters.
sensor_args = {
'11': Hema_DHT.DHT11,
'22': Hema_DHT.DHT22,
'2302': Hema_DHT.AM2302
}
if len(sys.argv) == 3 and sys.argv[1] in sensor_args:
sensor = sensor_args[sys.argv[1]]
pin = sys.argv[2]
else:
print 'usage: sudo ./Hema_DHT.py [11|22|2302] GPIOpin#'
print 'example: sudo ./Hema_DHT.py 2302 4 - Read from an AM2302 connected to GPIO #4'
sys.exit(1)
# Try to grab a sensor reading. Use the read_retry method which will retry up
# to 15 times to get a sensor reading (waiting 2 seconds between each retry).
humidity, temperature = Hema_DHT.read_retry(sensor, pin)
# Un-comment the line below to convert the temperature to Fahrenheit.
# temperature = temperature * 9/5.0 + 32
# Note that sometimes you won't get a reading and
# the results will be null (because Linux can't
# guarantee the timing of calls to read the sensor).
# If this happens try again!
if humidity is not None and temperature is not None:
print 'Temp={0:0.1f}* Humidity={1:0.1f}%'.format(temperature, humidity)
else:
print 'Failed to get reading. Try again!'
sys.exit(1)
except Exception as ex:
print 'Unable to login and get spreadsheet. Check OAuth credentials, spreadsheet name, and make sure spreadsheet is shared to the client_email address in the OAuth .json file!'
print 'Google sheet login failed with error:', ex
sys.exit(1)
print 'Logging sensor measurements to {0} every {1} seconds.'.format(GDOCS_SPREADSHEET_NAME, FREQUENCY_SECONDS)
print 'Press Ctrl-C to quit.'
worksheet = None
while True:
# Login if necessary.
if worksheet is None:
worksheet = login_open_sheet(GDOCS_OAUTH_JSON, GDOCS_SPREADSHEET_NAME)
# Attempt to get sensor reading.
humidity, temp = Hema_DHT.read(DHT_TYPE, DHT_PIN)
# Skip to the next reading if a valid measurement couldn't be taken.
# This might happen if the CPU is under a lot of load and the sensor
# can't be reliably read (timing is critical to read the sensor).
if humidity is None or temp is None:
time.sleep(2)
continue
print 'Temperature: {0:0.1f} C'.format(temp)
print 'Humidity: {0:0.1f} %'.format(humidity)
# Append the data in the spreadsheet, including a timestamp
try:
worksheet.append_row((datetime.datetime.now(), temp, humidity))
except: