E.getTemperature() results when below zero

[espruino-discuss]

Posted at 2017-01-10 by Eric

I am logging temperatures using the E.getTemperature() function in a Puck and one night I read back values of 255C which on a very cold night assumed that it was actually -1.

Should we be doing anything to sign the results to allow temperatures below zero?

[gfwilliams]

Posted at 2017-01-10 by @gfwilliams

How exactly did you report the temperature back?

Looking at the code, it seems like it should work (or if it breaks it should return something other than 255) - my guess is that E.getTemperature() might actually be working correctly, and it's something else further down the line that's getting confused.

[espruino-discuss]

Posted at 2017-01-10 by Eric

It is the very basic code you published for the Puck.js:

NRF.setAdvertising({
    0x1809 : [Math.round(E.getTemperature())]
  },{
    name: "Puck.js 13f1"
  });

Perhaps I need to parse the results in node-red but its returning an unsigned int (I think)

[gfwilliams]

Posted at 2017-01-11 by @gfwilliams

Ahh - you're using EspruinoHub? It's entirely likely that EspruinoHub isn't doing be doing the conversion from unsigned to signed.