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Perhaps could you try to temporarily disable authentication on your router.

I will give it a try but how would that help if I am unable to config the wifi dongle to connect to my ssid in the first place? 

I setup an open wifi network and rebooted the pi with the wifi dongle. I see no difference. ifconfig shows only lo and eth0, but no wifi :-(

You appear to be running the read only file system, which is what the root greeting means.  

So  in order to add those a lines to the files to configure the wifi you will need to do it when the SD card is plugged into a different computer and not modify them on the raspberry pi itself.

sorry ukmoose, I forgot to mention that I made those changes by putting the rootFS in RW mode first (ipe-rw)... that way the files can be edited while ssh'ed into the pi.

Sorry, no time to investigate your problem (I just triggered on Wi-Fi Raspberry Pi, consider this as an automatic answer), but you might find interesting information in there:

http://openenergymonitor.org/emon/node/2941

especially the link to M Svay's blog:

http://svay.com/blog/setting-up-a-wifi-connection-on-the-raspberrypi/

thanks to which I could get mine to work.

Thanks a bunch Jerome, I will investigate :-) 

Hi aet!
I'm experiencing the very same issue. Have you been able to resolve it?
Any help is appreciated!

Which Pi set up are you using? The 20th January image has a problem that prevents it working on WiFi. Trystan & Glyn  are aware of the problem and are working on a fix.

If you run update & upgrade on the earlier image the same problem occurs. 

Regards

Ian

Thank you for your quick response!
 

I am using the ready-to-go SD-card image linked here: http://emoncms.org/site/docs/raspberrypigateway

and I ran apt-get update and upgrade. I´ll try to reinstall the system without running these commands!

[EDIT:]

I reflashed my SD card and changed /etc/network/interfaces and /etc/wpa_supplicant/wpa_supplicant.conf as described here: http://wiki.openenergymonitor.org/index.php?title=Raspberry_Pi#Using_WiF...

Unfortunately I am receiving the very same error message as before when running ifup wlan0: "Cannot find device "wlan0""

I am using the same wifi dongle as aet (with an RTL8188CUS chipset) and can see the device when running lsusb.

I suppose this is because of lacking wifi drivers, is that possible?

[EDIT #2:]
I switched back to raspbian, configured it to minimize write- operations and now the wifi dongle is working like a charm. I also had troubles connecting my arduino nano to the raspberry running ipe- r1, but this issue has also been revolved by switching to raspbian.

Thank you for your efforts!

Regards,

tonnenpinguin

Great.

Can you detail or point to a doc showing how to proceed to minimize write operations ?

Thanks.

(I use raspian myself, and didn't do anything special. I just avoid using emoncms on it, and I try not to limit the logging to what is needed for the tests.)