Apologies for dragging this up from the dead... I, too, have a wmr200 that has been running fine (with only very occasional reception loss e.g. on low battery or significant local RF transmission) standalone for several years.
I recently installed WeeWx/Apache2 running headless on an early Raspberry Pi running the standard (Debian) wheezy image. Software runs fine, no log issues, generates reports nicely. I lost reception from the outdoor sensors as soon as I connected the USB cable to the WMR- even if WeeWx isn't running on the RaPi. it is like magic- connect- lose sensors-disconnect and the data returns to the display. I guessed there was an RFI/EMI problem, so added ferrite slugs to all the RaPi cables- now I just lose the wind sensor (which i think is the poorest transmitter as it suffers very occasional data loss normally). My question is, did you succeed in making it reliable, and has anyone experimented with grounding? I'm going to split the cables as above but both the RaPi and the WMR have cheap floating-output switch mode PSUs which makes me think providing a ground might help? Thanks, Peter p.s. *please* don't tell me to get a Vantage; that was my undisputed choice but I ended up with the WMR because 'someone' spotted a Christmas present opportunity whilst I was working myself up to spend what the Davis cost ;-) On Thursday, March 27, 2014 at 12:25:38 AM UTC, Neville Davis wrote: > > As a suggestion maybe screened twisted with one end of the screen tied to > oV or frame if possible..... > > I am keeping track of this for myself possibly :) > > Neville > > On Wednesday, March 26, 2014 12:04:59 AM UTC+10, Per Edström wrote: >> >> You're right! I will fight to the bitter end! >> >> Round 1 to me at least: I opened WMR200 and found that they put VCC/GND >> from power supply next to the USB in the same band-cable. This will >> probably induce USB-interference in the power for the circuits hence >> blocking out radio reception. I separated the VCC (brown) and GND (green) >> and this improved reception quite a lot! Note that on my other WMR200 the >> VCC is green and minus is brown. >> >> Next step is to run the USB-cables /red/orange/yellow) through a >> ferrite-core but I need new longer cables for this, maybe twisted ones too, >> now they are too short/no space there for the ferrite when closing the box.. >> >> >> >> <https://lh6.googleusercontent.com/-sDeR2xkVEXc/UzGMbMBQkYI/AAAAAAAAFaw/PDkWgF8RTIc/s1600/2014-03-22+13.30.54.jpg> >> > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
