[solved] Temperature sensor way off?

[espruino-discuss2]

Posted at 2024-03-19 by Pologram

Hello,

The temperature sensor of my Bangle JS 2 reads 32°C (on multiple apps) in a room that is 20°C at most. I put the watch on a table for a while to make sure the heat doesn't come from my skin but no change.

Do you know what could cause this issue ?
I am running firmware 2v21.

Thanks

[espruino-discuss2]

Posted at 2024-03-20 by @gfwilliams

What are you using to read? E.getTemperature or:

Bangle.getPressure().then(d=>{
  console.log(d);
  // {temperature, pressure, altitude}
});

The first uses the sensor in the Bangle's CPU, but the latter uses the altimeter chip which should be a lot more accurate.

... but even so the Bangle will take maybe an hour to cool down after you've worn it for a bit

---

Posted at 2024-03-20 by Pologram

I am using the "BW Clock" and "Altimeter" apps.
Looking quickly at the code it looks like they are using the barometer. (I could be wrong though)

I tried to let the watch cool down the whole morning and the temperature now reads 25°C which seams more reasonable. Wikipedia says that skin temperature varies between 33.5 and 36.9 °C so the 32°C I read yesterday makes sense.

I suppose I wasn't patient enough the first time.

Thanks