[OpenTRV-dev] Temperature reading too high?

Damon Hart-Davis dhd at exnet.com
Thu Mar 3 21:26:19 GMT 2016

> On 3 Mar 2016, at 21:20, Jeremy Poulter <jeremy at bigjungle.net> wrote:
> Hi,
> After the OpenTRV/OEM hackathon I updated the firmware on my Rev 2 board. After that it looks to be reading ~2C higher than the emonTH I have in a similar location where as before the update the temps where approx the same.
> Have a look at https://emoncms.org/vis/multigraph?mid=9900&embed=1&apikey=1a6f5473614b408690f6397fb1fdc001.
> I updated the firmware to the latest Git on the 24th Feb, if you check the temps befpre that you will see that 'Office Temperature' (the emonTH) and 'Office Temperature OpenTRV' are more or less the same (ignore Soil Temperature this is a temp sensor in a pot plant and expected to be a few degrees lower). After the 24th, Office Temperature OpenTRV is consistently a few degrees higher than the emonTH. To the best of my knowledge nothing has changed other than the firmware.
> Let me know your thoughts.

Is this a unit with the receiver always on (ie a hub with ‘C’ > 0), and does it have good air-flow?  I have stopped trying to turn the receiver on to reduce self-heating, at least for the moment.



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