DHT22 Adafruit_DHT sensor import error

So, I correctly connected my DHT22 humidity sensor to my BeagleBone Black Rev C. I am running Mavericks OS on my MacBook Pro and I followed the directions provided by Adafruit on how to use my DHT22

The website I used was pretty clear: https://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging/software-install-updated

Also the github files are cloned here: https://github.com/adafruit/Adafruit_Python_DHT

I entered the following lines:

git clone https://github.com/adafruit/Adafruit_Python_DHT.git

cd Adafruit_Python_DHT

sudo apt-get upgrade

sudo apt-get install build-essential python-dev

sudo python setup.py install

cd examples

sudo ./AdafruitDHT.py 22 P8_11

      

I am successful until the last line. After entering this last line (sudo./AdafruitDHT.py 22 P8_11) the following error message appears:

Traceback (most recent call last):
  File "./AdafruitDHT.py", line 23, in <module>
    import Adafruit_DHT
ImportError: No module named Adafruit_DHT

      

I know there is an Adafruit_DHT file somewhere because when I am in the Adafruit_Python_DHT directory I get this:

root@beaglebone:~/Adafruit_Python_DHT# ls
Adafruit_DHT  examples  ez_setup.py  ez_setup.pyc  LICENSE  README.md  setup.py  source

      

I tried reinstalling setup.py but the result is the same.

I've followed all the directions that Adafrut has suggested, but I just can't get past it. Any idea what is going on? This looks like a simple problem, but it is one of the main obstacles in getting readings from my DHT22. If there is more information needed to answer this problem, please let me know.

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3 answers


Simple fix:

cd Adafruit_Python_DHT

sudo apt-get update

sudo apt-get install build-essential python-dev python-openssl

sudo python setup.py install

      



Try to run the file again sudo ./AdafruitDHT.py ## ## ...

You may have forgotten to run the setup correctly.

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It seems that your script cannot find the Adafruit_DHT module. There are two ways.



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Okay, try running this script with "sudo".

import sys
import Adafruit_DHT

def main():
    sensor_args = { '11': Adafruit_DHT.DHT11,
                        '22': Adafruit_DHT.DHT22,
                        '2302': Adafruit_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 ./Adafruit_DHT.py [11|22|2302] GPIOpin#'
        print 'example: sudo ./Adafruit_DHT.py 2302 4 - Read from an AM2302 connected to GPIO #4'
        sys.exit(1)

    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)

if humidity is not None and temperature is not None:
    print 'Temp={0:0.1f}*C  Humidity={1:0.1f}%'.format(temperature, humidity)
else:
    print 'Failed to get reading. Try again!'

if __name__ == '__main__':
   main()

      

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