[Ovmsdev] Celcius vs Fahrenheit, Kilometers vs Miles

[Mark Webb-Johnson]

Felix,

What about the choice? Should we use what is configured in the car, or what is configured on the phone?

For example, a car configured to use Miles, but shown on a phone configured as metric.

Regards, Mark.

On 9 May, 2012, at 8:20 AM, felix bonnier wrote:

> To My knowledge both are used in europe so you can leave the pressure in PSI but someone else might think differently........
> 
> Sent from my iPad somewhere in our beautiful universe.......
> 
> On 9 May, 2012, at 8:16, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
> 
>> 
>> In the car module, and protocol, there is a setting for Miles vs Kilometers and all the distance based measurements (speed, ideal and estimated ranges) are sent from the module in those units.
>> 
>> The protocol states that temperatures (pem, motor, battery, ambient and tpms) should be sent in celcius, and tpms pressures in PSI - and that is what is currently done.
>> 
>> We don't currently convert these to user-suitable units in the iOS App. We leave them in celcius and psi.
>> 
>> Doing the conversion in the App is certainly possible, but my question is how to control this and what to do?
>> 
>> Options I see:
>> 
>> Use the Miles/Kilometer value coming from the car.
>> Use the iOS NSLocale system to read user preferences from the device itself, and convert _everything_ to that.
>> Use the iOS NSLocale system to read user preferences from the device itself, and convert just temperatures/pressures to that.
>> 
>> I've left out [4] "have individual settings in the app for each of temperatures, distance and pressure" as it is overly complicated.
>> 
>> We could convert temperatures from celcius to fahrenheit (using Tf = (9/5)*Tc+32).
>> We could convert pressures from PSI to kPa (using Pkpa = Ppsi * 6.895).
>> 
>> For tire pressures, what is currently used in Europe? I still see PSI used here in Hong Kong, even thought we use Kilometers for distance, but do we need to convert this to something else? I notice the roadster still shows pressures in PSI even though the car is metric and shows kilometers. Is it OK to leave this in PSI?
>> 
>> What do US cars show for ambient and tpms temperatures on the in-car VDS? Celcius / Fahrenheit?
>> 
>> Regards, Mark.
>> 
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