Discussion about Units of Measurement

Setup, Configuration and Use Runtime
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Hi Everyone,

I, for one, am really excited about the Units of Measurement feature.
There are a number of units already available in the code:

I have already added the pressure unit “bar” to the UoM

My question to you all is:

What units would you like to see added to the list?

Thanks

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https://en.wikibooks.org/wiki/Units_of_Measurement/Pressure


http://www.reiner-tolksdorf.de/tab/einheiten_druck.html

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Thanks @hr3, Harry,
I have added bars in a pull request already, but what units would you find useful?

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Really, no one want to add units to the system?

Flow rates? Fuel Efficiency? pH?

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Humidity? Not sure if that has a UoM technically, as it’s usually expressed as a percentage.
Checked, and yes there are ‘absolute’ humidty units. Conversion to RH% not possible without further information (temp).

Rotational speed? e.g. rpm. I have no use-case for that!

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You are correct technically but that’s already in the units

example:

Number:Dimensionless Humidity "Humidity [%d %]"
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What about RAIN mm/hr?
And I’m using a custom absolut humidity in g/m³ that can be even espressed in g/kg (g of water on kg of air)

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And as the other thread you would like two more units of power VA and VAR, correct?
ApparentPower VA
ReactivePower VAR

Thanks

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That would be a Speed quantity, Thanks

That would be a new Type of Density with the base unit as SI kg/m³

That would be a Dimensionless unit part per thousand (I plan to add this)

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yes and what about the speed Mbit/s or MByte/s?

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New unit type DataRate what should the base unit be? bit/s or byte/s

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https://lifehacker.com/the-difference-between-bits-and-bytes-and-why-it-matte-510705022
Here they say the standard is B/s. b/s is only used when buying broadband from providers.
Must be kept in mind that the conversion between b/s to B/s is 8/1 and MB/s to B/s is 1024/1

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It’s the week-end.
Has anyone requests for units to be added to the Units of Measurements
I am thinking of our friends from the USA.

US gallons?
PSI?

Thanks

1 Like
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Have a look at the Datapoint types in KNX’s Engineering Tool Software. That will give you a pretty comprehensive list of building control related units of measurement.

This list is a bit old but is a starting point!
http://www.sti.uniurb.it/romanell/Domotica_e_Edifici_Intelligenti/110504-Lez10a-KNX-Datapoint%20Types%20v1.5.00%20AS.pdf

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Perhaps Nautical miles (distance), Knots (speed). Someone must have OpenHAB on a boat …

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I need:
litre / second (l/s)
cubic meter / hour (m3/hour)

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What about µS/cm?

The electric conductivity e.g. also for soil fertility measurement as is the case with the Miflora sensor.

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So far, electric charge has only unit C, mAh is not SI unit, but it’s also common unit for charge.

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@vzorglub would litres be something to add? I noticed it was missing from the list. The HP Printers deal in microlitres/millilitres for marking agent used…

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AFAIK LITRE should be available in SmartHomeUnits. It is possible to modify them by a MetricPrefix like MICRO or MILLI (e.g. MetricPrefix.MILLI(SmartHomeUnits.LITRE)). Does that work for you @Cossey?