33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
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import sys
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import Adafruit_DHT
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# Parse command line parameters.
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sensor_args = { '11': Adafruit_DHT.DHT11,
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'22': Adafruit_DHT.DHT22,
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'2302': Adafruit_DHT.AM2302 }
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if len(sys.argv) == 3 and sys.argv[1] in sensor_args:
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sensor = sensor_args[sys.argv[1]]
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pin = sys.argv[2]
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else:
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print('usage: sudo ./Adafruit_DHT.py [11|22|2302] GPIOpin#')
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print('example: sudo ./Adafruit_DHT.py 2302 4 - Read from an AM2302 connected to GPIO #4')
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sys.exit(1)
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# Try to grab a sensor reading. Use the read_retry method which will retry up
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# to 15 times to get a sensor reading (waiting 2 seconds between each retry).
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humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
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# Un-comment the line below to convert the temperature to Fahrenheit.
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# temperature = temperature * 9/5.0 + 32
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# Note that sometimes you won't get a reading and
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# the results will be null (because Linux can't
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# guarantee the timing of calls to read the sensor).
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# If this happens try again!
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if temperature is not None:
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print('{0:0.1f}'.format(temperature))
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else:
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print('Failed')
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sys.exit(1)
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