Hi Luc, Some progress. a) I first tried on a clean Debian install on a spare Sheevaplug I had (my previous logs are from that) - didn't work, but might be a USB issue? - will try again sometime with a powered USB hub as the Sheevaplug only has one USB port.
b) Made a clean Debian install on a recycled ex thin client - Intel Atom i386 - didn't properly compile rtldavis and so didn't work. c) Shut down on of my Pi3's and made a clean install on a fresh SD card, compiled/installed everything and it works (well, mostly). The Pi3 is complaining about 'outHumidity' - what do you think Luc?? Nothing is being shown on the humidity graph either. Apr 24 16:00:53 raspberrypi weewx[8765]: engine: 2019-04-24 16:00:53 BST (1556118053) LOOP value 'outHumidity' 471.537 outside limits (0.0, 100.0) Apr 24 16:01:03 raspberrypi weewx[8765]: engine: 2019-04-24 16:01:03 BST (1556118063) LOOP value 'outHumidity' 471.537 outside limits (0.0, 100.0) Apr 24 16:01:44 raspberrypi weewx[8765]: engine: 2019-04-24 16:01:44 BST (1556118104) LOOP value 'outHumidity' 471.838 outside limits (0.0, 100.0) Apr 24 16:01:54 raspberrypi weewx[8765]: engine: 2019-04-24 16:01:55 BST (1556118115) LOOP value 'outHumidity' 471.838 outside limits (0.0, 100.0) Apr 24 16:02:35 raspberrypi weewx[8765]: engine: 2019-04-24 16:02:36 BST (1556118156) LOOP value 'outHumidity' 471.236 outside limits (0.0, 100.0) Apr 24 16:02:45 raspberrypi weewx[8765]: engine: 2019-04-24 16:02:46 BST (1556118166) LOOP value 'outHumidity' 471.236 outside limits (0.0, 100.0) Apr 24 16:03:26 raspberrypi weewx[8765]: engine: 2019-04-24 16:03:27 BST (1556118207) LOOP value 'outHumidity' 471.537 outside limits (0.0, 100.0) Apr 24 16:03:37 raspberrypi weewx[8765]: engine: 2019-04-24 16:03:37 BST (1556118217) LOOP value 'outHumidity' 471.537 outside limits (0.0, 100.0) Apr 24 16:04:18 raspberrypi weewx[8765]: engine: 2019-04-24 16:04:18 BST (1556118258) LOOP value 'outHumidity' 472.741 outside limits (0.0, 100.0) You can see both my console based weewx and the RTLdavis one here www.nthead.co.uk Once again, thanks for your efforts Luc. Nigel
