I have just installed (separate) temperature and humidity sensors
connected to a Raspberry Pi 2 in my summerhouse. The values from both
sensors are oscillating in parallel: looking at values over an 8 hour
period, max-to-min is typically 14 minutes and min-to-max is typically
24 minutes. The sensors are being read by a One-wire protocol and are
serially connected by Cat5 cables to a DS2490 USB adaptor. The humidity
sensor is fed by an external 5v source, and the temperature is passive.
The only other electrical device in the summerhouse is a new freezer. A
previously installed temperature sensor (different from the current one)
did not exhibit this behaviour. This seems to implicate the new humidity
sensor, but I can't think how. Can anyone suggest a reason for this
regular oscillation?
TIA
Graeme
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