[units] "Simple" conversion from Kelvin to Celsius
Hello, It's been a couple of years since I've done any work with Boost.Units, and I am finding that I want to make a dimensionally-safe conversion from Kelvin to Celsius. I've got an I2C controller that reports in Kelvin, but I want to report it to the end-user in Celsius. The examples I am finding seem to "almost" fit the bill, but I am having a difficult time extrapolating a sane conversion. First, would help if I understood what the Boost.Units SI (my assumed base-system) base-temperature units were. I gather Fahrenheit? Or is it indeed Kelvin? I could be mistaken. Thank you... Regards, Michael Powell
On 08/14/2013 03:39 PM, Michael Powell wrote:
Hello,
It's been a couple of years since I've done any work with Boost.Units, and I am finding that I want to make a dimensionally-safe conversion from Kelvin to Celsius.
I've got an I2C controller that reports in Kelvin, but I want to report it to the end-user in Celsius.
The examples I am finding seem to "almost" fit the bill, but I am having a difficult time extrapolating a sane conversion.
First, would help if I understood what the Boost.Units SI (my assumed base-system) base-temperature units were. I gather Fahrenheit? Or is it indeed Kelvin? I could be mistaken.
The SI system uses Kelvin as its temperature unit. This is reflected in the Boost.Units documentation here: http://www.boost.org/doc/libs/1_54_0/doc/html/boost_units/Reference.html#hea... Jason
There are some subtleties for temperature conversions, depending on whether you want to convert relative temperatures (differences) or absolute temperatures. See here for example : http://www.boost.org/doc/libs/1_54_0/doc/html/boost_units/Examples.html#boos... Matthias
Hello,
It's been a couple of years since I've done any work with Boost.Units, and I am finding that I want to make a dimensionally-safe conversion from Kelvin to Celsius.
I've got an I2C controller that reports in Kelvin, but I want to report it to the end-user in Celsius.
The examples I am finding seem to "almost" fit the bill, but I am having a difficult time extrapolating a sane conversion.
First, would help if I understood what the Boost.Units SI (my assumed base-system) base-temperature units were. I gather Fahrenheit? Or is it indeed Kelvin? I could be mistaken.
Thank you...
Regards,
Michael Powell _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
On Aug 22, 2013, at 10:25 AM, Matthias Schabel <boost@schabel-family.org> wrote:
There are some subtleties for temperature conversions, depending on whether you want to convert relative temperatures (differences) or absolute temperatures. See here for example :
http://www.boost.org/doc/libs/1_54_0/doc/html/boost_units/Examples.html#boos...
Oh yes. My daughter bought a sun-shade to go inside her car, and on the packaging it says "Keeps your vehicle up to 44°F/7°C cooler" Ouch. -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki
Well... As it turns out, our little fuel gauge, while it can report temperatures, OT, UT (over/under), and so on, the temperature parts are not hooked up. I haven't read the data sheet that closely, but my guess is that's temperature from a known reference voltage, usually converted to/from a DAC somewhere. Anyhow, thank you those who responded or are following this for the clarification. Regards, Michael Powell On Thu, Aug 22, 2013 at 12:25 PM, Matthias Schabel <boost@schabel-family.org> wrote:
There are some subtleties for temperature conversions, depending on whether you want to convert relative temperatures (differences) or absolute temperatures. See here for example :
http://www.boost.org/doc/libs/1_54_0/doc/html/boost_units/Examples.html#boos...
Matthias
Hello,
It's been a couple of years since I've done any work with Boost.Units, and I am finding that I want to make a dimensionally-safe conversion from Kelvin to Celsius.
I've got an I2C controller that reports in Kelvin, but I want to report it to the end-user in Celsius.
The examples I am finding seem to "almost" fit the bill, but I am having a difficult time extrapolating a sane conversion.
First, would help if I understood what the Boost.Units SI (my assumed base-system) base-temperature units were. I gather Fahrenheit? Or is it indeed Kelvin? I could be mistaken.
Thank you...
Regards,
Michael Powell _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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Jason Roehm -
Marshall Clow -
Matthias Schabel -
Michael Powell