Calibration missing?? - Githubissues

btittelbach commented 2 years ago

Hi,

My two CO2-Ampel are offset by 400ppm even when next to each other. Very likely they need calibration. How is calibration handled with the firmare? I was not able to find any evidence that it is implemented.

in sensors.cpp I found a function() for calibration, but it does not seem to be called by anything.
in CO2-Ampel_Plus.ino there is a comment describing the buttons one needs to press for calibration, but this seems to refer to the original watterott firmware and not work with this firmware
In Issue #7 someone already asked this question, but it was not answered

If you have plans to implement calibration

what is the plan? / timeline? / current state? / current problems with that?
anything I can do to help and code this over the next few days?

mariolukas commented 2 years ago

what is the plan? / timeline? / current state? / current problems with that?

This code was derived from a very early version of the Watterott Firmware. I added the calibration routine, but it was never fully implemented. I think the calibration process needs more than only the code. We will also need a part in the documentation. As far as i know do those SCD based Co2 Sensors need a couple of hours/days for calibrating. Best case of calibrating is outside in the fresh air. But i am not sure about that, somebody should do some research by reading the datasheet.

There is no plan/timeline now. I don't have the time to implement it yet. But and that leads to the next point....

anything I can do to help and code this over the next few days?

Feel free to do an implementation and a PR. I would appreciate it.

btittelbach commented 2 years ago

The above mentioned pullrequest should fix this issue

mariolukas / Watterott-CO2-Ampel-Plus-Firmware

Calibration missing?? #47