WMR 200 - alix 3 board & meteohub: huge sensor problems :(

[devriendtm]

Hello,

I'm having very strange problems with my setup.

I'm having a very unreliable connection to my wireless sensors when i plug in the usb cable on the alix 3 board.

It loses connection a certain time after plugging in the cable, unplugging it results in an almost immediate reading.

After browsing a bit on the subject i've found this:

http://www.midlandsweather.org.uk/equip ... mr200.html

the solution of changing the usb port is even worse :(

on the system log:
Mar 20 23:23:37 meteohub kernel: wlan0: no IPv6 routers present
Mar 20 23:25:36 meteohub kernel: usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd hidlog3 rqt 33 rq 9 len 8 ret -110
Mar 20 23:35:51 meteohub kernel: usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd hidlog3 rqt 33 rq 9 len 8 ret -110
Mar 20 23:38:56 meteohub kernel: usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd hidlog3 rqt 33 rq 9 len 8 ret -110
Mar 20 23:47:06 meteohub kernel: usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd hidlog3 rqt 33 rq 9 len 8 ret -110
Mar 20 23:48:36 meteohub kernel: usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd hidlog3 rqt 33 rq 9 len 8 ret -110


on the meteohub log:
ogger (20.03.2010 23:33:12): connect station 0 (WMR-200 via USB HID).
logger (20.03.2010 23:36:06): station 0 (WMR-200), wrong checksum (0300 vs computed 0329) for sensor model d6 in byte sequence: d6 0d 00 03 03 01 07 ee 63 d7 10 00 03
logger (20.03.2010 23:39:16): station 0 (WMR-200), wrong checksum (cd00 vs computed 01f0) for sensor model d7 in byte sequence: d7 10 03 03 03 01 07 d7 10 03 03 03 01 07 00 cd
logger (20.03.2010 23:47:26): station 0 (WMR-200), wrong checksum (0103 vs computed 02c6) for sensor model d7 in byte sequence: d7 10 0b 03 03 01 07 02 cf 00 d7 10 0b 03 03 01


is it the software that bugs the wmr 200?

what can i do, to solve this annoying problem :(


thanx in advance.

Miguel

[skyewright]

the solution of changing the usb port is even worse :(

I've no personal experience of this problem, but...

Have you tried using a different USB cable?

In the UK at least the WMR200 cable already has RF chokes fitted at both ends (which is good!), but you might be able to improve on the cable quality or shielding? If you could manage with a shorter cable that might help too.

[devriendtm]

I have already changed the cable, to a very short usb cable, same thing.

(the one i originally used has indeed rf chokes)

strange thing, if i use my normal pc's usb port, the logging stays good!

[skyewright]

strange thing, if i use my normal pc's usb port, the logging stays good!

Could the problem perhaps be some sort of interference coming from something at the ALIX 3 end?

Do you maybe have an alternative PSU with the same rating and connector that you could try?

Alternatively, something I've seen done at the WMR200 end in an attempt to improve signal quality is to use a ferrite core ring on the cable from the PSU! That's mentioned in this Weather-Watch.com topic.