Shelly-homekit: Add support for fan with speeds using Shelly 2.5

[MichaelVdheeren]

Can we get a firmware version that allows the Shelly 2.5 to be used as a fan within Homekit with each of the inputs being mapped to a fan speed? No input would mean fan is low, input 1 means fan is medium, input 2 means fan is high. Mapped to the same output of course.

[freddair]

My bath fan has 2 speeds which correspond to 2 fan inputs / Shelly outputs:

So for me Shelly 2.5 would need to interlock output 1 and 2.

off: both outputs off
low: output 1 on, output 2 off
high: Output 1 off, output 2 on

When both outputs are on, the fan runs very low, but I am not sure if it's safe to use as that's not specified in the manual.

[andyblac]

why not just set homekit type to fan in homekit settings ?

[freddair]

That's what I currently do using an Aqara double rocker switch. The problem is that it just appears as 2 separate Fan switches and not as fan speed steps, and it does not allow real interlocking of the outputs. I simulate it with scenes but it's not optimal as relays don't switch simultaneously (one after another).

[MichaelVdheeren]

Correct, just changing from switch to a fan is an icon. This means I get two elements in the Home App and not a single fan with two speeds that I can set. What we would need is what you see below.

[rojer]

HAP fan service has speed control as a %, from 0 to 100, but i guess we could have 0-30-60-100 fixed points, something like that.
i am not familiar with fans (i live in ireland, you see, we don't need them here :) ), can you explain what kind of fan are you using? what are the connections?
how common is this type of fan?

[freddair]

Here's mine, built into the bathroom ceiling to exhaust steamy and/or stinky air ;-)

https://www.vortice.ltd.uk/shop/residential-ventilation/quadro/quadro-micro-100-i-es/

[MichaelVdheeren]

I have exactly the same as above. Very common system in Belgium used for ventilation of the home which is mandatory for newly built homes.

I would suggest using 0 - 50 -100 because you can not turn of most of these ventilators - by default they are always in stand 1. You can change them to mode 2 or mode 3.

[jsiegenthaler]

High speed is obviously 100%
Low speed could be user-configurable, or locked at 50%
The core question would be: how would homekit react to the speed control slider: would it "lock" to 50% when between 25% and 75%, and lock to 0% or 100% when outside of the 25-75% range?
Also, anyone wiring this up must be sure not to wire Live to both terminals at the same time. Some fans are simple and use a series resistor to slow down the speed, then it wouldn't matter. But some fans might have different coils or taps on the coils to change the motor speed. Then it may very much matter how it is switched.

[andyblac]

my bathroom fan is a constant presure fan with boost. ie it is contantly on, and when you flip the switch it goes into boost mode. it also has it own onboard moisture sensor that spin up the fan as needed depending on humidity.

https://www.greenwood.co.uk/product/153/unity-cv2gip

[freddair]

Yeah in Germany it's also mandatory in any bathroom or kitchen at least if it has no window.

[rojer]

The core question would be: how would homekit react to the speed control slider: would it "lock" to 50% when between 25% and 75%, and lock to 0% or 100% when outside of the 25-75% range?

1 to 50 would round up to 50, 51 to 100 round up to 100..
the way it works with homekit is, home controller (aka home app) tell you to set it to something like 41, you go - wure enough, ok, then report "set to 50", and it'll update the display. at least that's the way it works with roller shutter positioning.
it tells you "set foo X", you nod, then say "foo is now Y", and it's fine :)

Also, anyone wiring this up must be sure not to wire Live to both terminals at the same time.

sure, that can be arranged.

should also support simple on/off for singe output deices (i.e.0 and 1-100 rounding up to 100), shelly 2 and to have additional position at 50.

[MichaelVdheeren]

Maybe this can help: https://github.com/adri/homebridge-itho-cve-eco-rft

[jsiegenthaler]

1 to 50 would round up to 50, 51 to 100 round up to 100..

Wouldn't that would be quite hard to control, as you have to deliberately
get the slider under 1% to switch off the fan?
That's why I suggested 25%, it gives more of a "snap to the desired
location" behaviour.
You could do 10% & 90% instead of 25% and 75%.
But 1% and 99% is a bit extreme....

Anyway, theoretical for me, as I don't use a shelly dimmer to control my
fan ;)

On Mon, 14 Dec 2020 at 16:46, Deomid Ryabkov [e-mail]
wrote:

The core question would be: how would homekit react to the speed control
slider: would it "lock" to 50% when between 25% and 75%, and lock to 0% or
100% when outside of the 25-75% range?

1 to 50 would round up to 50, 51 to 100 round up to 100..
the way it works with homekit is, home controller (aka home app) tell you
to set it to something like 41, you go - wure enough, ok, then report "set
to 50", and it'll update the display. at least that's the way it works with
roller shutter positioning.
it tells you "set foo X", you nod, then say "foo is now Y", and it's fine
:)

Also, anyone wiring this up must be sure not to wire Live to both
terminals at the same time.

sure, that can be arranged.

should also support simple on/off for singe output deices (i.e.0 and 1-100
rounding up to 100), shelly 2 and to have additional position at 50.

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[timoschilling]

The HAP has a step value setting for that.
So we can say it has step value of 50. Which mean the HomeApp only allows 0%, 50% and 100%, then there is no need to round the value.

Here is an Golang example for that https://github.com/brutella/hc/blob/master/characteristic/rotation_speed.go#L16

[rojer]

step value has to be exactly as specified in the standard, i.e. 1, or controller won't even add the device.

[timoschilling]

If have tested it with the Simulator and it works.

[rojer]

i'm pretty sure i've had accessories rejected for incorrect step value before.
but ok, this is worth trying when implementing.
thanks!

[timoschilling]

Here is how it looks in the HomeApp

Each time the slider jumps up or down, I released the finger at 25% or 75%.

[MichaelVdheeren]

I managed to create this in homebridge-shelly. Maybe it can help you how the logic works.

https://github.com/MichaelVdheeren/homebridge-shelly/pull/1

step value can be anything. The maxValue should always be 100. If you would instead use 2 and stepvalue of 1 then it would work in the Home App but Siri would return 2% every time you try to set it to 100%. So there is some inconsistency of what Siri returns compared to what the Home App shows. Fixed this by using maxValue of 100 and stepValue of 50.