Calibration of temperature sensor

Submitted by Gams on Sat, 09/30/2017 - 10:01

Hi!

I recieved my pocketlab yesterday and am testing the sensors right now.  The tempersture sensor seems to be off a few degrees, but i think it would just need some calibration. My question is if its possible to calibrate it via app, so that the values that are calculated from it (dew point) are more precise too, right?

Thanks 

Gams 

Comments

PocketLab

Mon, 10/02/2017 - 19:45

Hi Gams, 

Glad you received the PocketLab and have everything up and running. Are you using a PocketLab Voyager or a PocketLab Weather? Also, do you have an attachable temperature probe for your unit? 

For both Voyager and Weather, one thing to keep in mind is that the internal temperature sensor measures ambient temperature and might have a longer time constant to "settle" on the correct temperature. This is because the sensor is inside the plastic housing, so it might take a few minutes for the ambient conditions inside the housing to match the ambient conditions of the room you're in, if, for example, the PocketLab has been sitting inside a warmer book bag, a pocket, or even your hand. 

For PocketLab Weather we optimized the weather sensors on board for accuracy, so if you have a PL Weather and it's still that much off let me know and we can troubleshoot further. For PocketLab Voyager, because there are so many more sensors and functions, it was a little more difficult to optimize initially. Basically the board on Voyager runs a little hotter than Weather because some of the other sensors are "always running" in the background. We have a firmware update that we are working on that will fix this issue. Once that is complete we can further calibrate/optimize the weather sensors on Voyager for greater accuracy. 

In the meantime, if the temperature probe works for your use case, that's going to give more accurate and responsive results. We'll have more details on the firmware update soon. 

Let me know if you have any other questions. 


Thanks! 

Robby

Hi Robby!

Thanks for the answer, indeed I have them both...

I already thought about letting them settle to ambient temperature before measurements, what I didn't think  about though was heat dissipation of the other sensors, which of course makes sence and is constant with the measured tmeperature of the voyager being higher than the one of the weather.

For now I'll keep playing mainly with the acceleration and magnetic field sensors anyway, which seem to give quite accurare results.