Typical Readings - Accelerometer & Temp

Hardware
1

Been playing around with the Hannah and just getting a feel for it. I’m playing with the different components on the board, and was wondering what others are getting for some of the readings.


Accelerometer - X: 2-8, Y:249-255, Z:60-63. This is when sitting upright.

Temperature Sensor - 27 C. This seems a bit high, as I really don’t think it’s 80 F a house that is set to 72 F (and the thermostat reading 73 F). It does seem to be working since the reading does lower when placed near an AC vent.
2

Bear in mind that the accel is signed: I’m sure this is a nasty way of doing it but…


if (x>127) x=-(256-x);
if (y>127) y=-(256-y);
if (z>127) z=-(256-z);

…will get them into the right ballpark.

As the default accel mode is +/-2g, Z being 60-63 indicates a 1g acceleration in the Z axis. Without changing your code, if you invert the hannah Z should go to about 192 (or, with the code above, -64).

I’m not very trusting of the temp sensor, in my experience it appears to read a bit high too…
3

Thanks for the tip & confirmation on the temperature sensor.


Still working on getting the other components working (particularly the light sensor) before I start interfacing with some real things.
4

I notice that the Temp Sensor seems to be about 5.1 degrees F too high as well.

5

For the new users here is temp code with an adjustment to get correct temp

Just modify the number next to tempadjustment as a positive or negative number that the temperature need to be adjusted by.

Example: tempadjustment = 5.1;