In message , Adrian
 writes
>PI 2 running Raspbrian, patched up to date a month ago.
>
>I've been running a Pi2 with a DHT22 temperature/humidty sensor
>attached since early June, and initially all was well.  It seems that
>the Edimax WiFi dongle stopped functioning (symptom was no network
>connectivity), on attempting to reboot, the whole thing stopped
>working, that looks as though it was the power supply that died.
>
>I've put another power supply on, and apart from the network connection
>still not working, all seemed well, until I looked at what the DHT22
>was doing, running the Adafruit_Python_DHT/examples/AdafruitDHT.py
>script I get :
>
>Traceback (most recent call last):
>  File "/home/pi/Adafruit_Python_DHT/examples/AdafruitDHT.py", line 41,
>in 
>    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
>  File "build/bdist.linux-armv7l/egg/Adafruit_DHT/common.py", line 94,
>in read_retry
>  File "build/bdist.linux-armv7l/egg/Adafruit_DHT/common.py", line 81,
>in read
>  File "build/bdist.linux-armv7l/egg/Adafruit_DHT/Raspberry_Pi_2.py",
>line 34, in read
>RuntimeError: Error accessing GPIO.
>
>
>Rummaging around online, I've seen various references to this, but they
>all seem to be for new installs, not a problem that has developed.
>
>One thought that occurred to me was that the new power supply (borrowed
>from my phone) might not have enough power output for anything more
>than the basic board.
>
>Any suggestions on where to look next ?
>
>Adrian

Problem now resolved.

The new power supply was plugged in, but that in itself didn't fix the
problem.  A new SD card was plugged in (the old one was showing various
errors which fsck didn't fix), and that has got me back up and running
again.


Adrian
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