Re: Pressure sensors

[Konrad Schroder <perseant%hhhh.org@localhost>]

At ${WORK} we frequently use single-digit milliTorr, as well as 1e-7 
Torr or so, for lab measurements.  I'm not sure that you want to support 
sensors in that range; I'm just mentioning it in an attempt to quantify 
a possible use case.

Take care,

-Konrad


On 1/2/19 11:31 AM, David Holland wrote:
> On Wed, Jan 02, 2019 at 01:56:12PM -0500, Greg Troxel wrote:
>   > > I would make it Pa in the API and let userland translate to whatever
>   > > values we want to display by default.
>   >
>   > That seems somewhat reasonable, except that in my experience everybody
>   > wants to see atmospheric pressure in mb/hPa (if they aren't using inches
>   > or mm of Hg).
>
> This is an integer API underneath, right? So the choice of kernel ->
> user reporting unit should be made on precision and range grounds.
> Which isn't much of a concern for atmospheric pressure as the possible
> range is narrow, but one could imagine someone trying to use the same
> interface for lab equipment.