On Sunday, 7 October 2018 16:25:42 BST Graeme Gemmill wrote: > Ralph, Terry, thanks for the replies. Further information: > Sensors are Hobby Boards DS18S20 and Sheepwalk SWE3 humidity sensor.
The only common factor with those two devices would seem to be the +5 V PSU brick. If the PSU voltage was varying by a small amount over time, then the readings will too. If this is the case, you might have to provide a PSU brick with better regulation or insert a regulator into the line between the brick and the devices. Can you run the two devices from separate PSUs to see if the variations stay in step? -- Terry Coles -- Next meeting at *new* venue: Bournemouth, Tuesday, 2018-11-06 20:00 Check if you're replying to the list or the author Meetings, mailing list, IRC, ... http://dorset.lug.org.uk/ New thread, don't hijack: mailto:dorset@mailman.lug.org.uk