55 lines
2.3 KiB
Python
55 lines
2.3 KiB
Python
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#!/usr/bin/python
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# Copyright (c) 2014 Adafruit Industries
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# Author: Tony DiCola
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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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] <GPIO pin number>')
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print('Example: sudo ./Adafruit_DHT.py 2302 4 - Read from an AM2302 connected to GPIO pin #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 humidity is not None and temperature is not None:
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print('Temp={0:0.1f}* Humidity={1:0.1f}%'.format(temperature, humidity))
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else:
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print('Failed to get reading. Try again!')
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sys.exit(1)
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