Homey Community Forum

Random flows

Hi
I have set up some flows to announcements setup using tts to my google Home speakers.
That is functioning fine, but I would like to have like 4 different flows or different cards that it should randomly choose to play from.

But I have know idea how to set it up so that when the main flow runs it should choose between 4 different announcements randomly.

Is there a simple example of setting op a flow that can do that.
Hope someone can help. :blush:

Something like this (to get the idea).
The logics condition “proceed with a chance of x %” is key here. It works with numbers around 49 and up (49.1).
Optional: I made a Logics numeric variable, so I can change the x % number (for finetuning) for all flows at once

The idea is workable, but the trigger for all subsequent flows should be “this flow was started”. Now they all go off at movement, and you get double actions. You also have the fact that the probability that the next flow is triggered decreases each time due to multiplication of the probability factors. I can’t think off the top of my head which probabilities you need to fill in to get a fair distribution. Im guessing it should be 25%, 33%, 50% and 100% if you have four options.

Another option is to use better logic, which can do math.js calculations and can probably generate a random number. then you can make a flow ladder like this testing which number came out. Or you could go for Homeyscript.

If you can use Homeyscript you could adjust this script. It was written to randomly play 14 different radiostations and playlist. You can use it to randomly fill one variable. That variable can be used because it is randomly filled. After it was executed you let the script run again to randomly fill this variable again

You’re absolutely right about the trigger part. I adjusted my examples.

I’ve tested this functionality. Each should have the same % value, like 49.

Tested also, and it can be done by Homey logics


BUT, it is not completely random though. One number is returned more often than the other

Have you tested with each flow with the right trigger, and tested by counting each option for large amounts? Because if you daisychain the flows then the first definitely has a higher chance than the next. Especially at 49 percent, because if the first option already has 49% chance, there’s only 51% chance left for the other three to even be considered.

By the way, if the last flow has a percentage chance of doing something, then there’s also a chance nothing happens. Hence my 100% chance at the end. If you didn’t pick any of the first three, there’s only one choice left. And if you’d consider looping back to the first flow, then you would increase the chance of the first option being chosen even more.

That is partially true. The random value should be evenly distributed, othersise it would be a useless function. But you use round, which means the first and the last value have only half the chance (due to the first option never having a chance rounding up, and the last value never having a chance of rounding down). So if you want to round, you should range from 0.5 to 4.499 to get an even distribution from 1 to 4.

This all is assuming the random function returns a decimal value from 0 to 4 and not an integer value.

You’re right, the condition isn’t needed there.
But I just quickly picked the flows from an example and just wanted to point out the “proceed with a chance of” logics condition card is the trick.

Like I said, I’ve tested it multiple times, other users too with a similar result.
It is not random.

-Who feeds the cat / Wie voert de kat-
Used ligics / Gebruikte logica {{round(random(1,4))}}

Who's turn was it / Wie is aan de beurt geweest (view the log below / zie log)
Nr. 1: 25x
Nr. 2: 36x
Nr. 3: 44x
Nr. 4: 12x

Trigger flow:
https://homey.app/f/KONH6x

Log:
2021-03-18 05:10.01.051		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 05:15.01.527		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 05:20.01.347		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 05:25.01.672		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 05:30.08.431		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 05:35.04.709		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 05:40.01.383		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 05:45.02.285		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 05:50.01.671		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 05:55.01.340		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 06:00.01.625		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 06:05.01.418		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 06:10.01.355		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 06:15.01.439		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 06:20.01.342		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 06:25.01.455		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 06:30.01.469		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 06:35.01.751		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 06:40.01.839		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 06:45.01.267		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 06:50.01.847		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 06:55.01.284		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 07:00.01.743		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 07:05.01.205		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 07:10.01.247		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 07:15.01.341		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 07:20.01.263		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 07:25.02.046		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 07:30.01.296		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 07:35.01.893		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 07:40.01.357		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 07:45.01.495		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 07:50.01.600		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 07:55.01.511		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 08:00.01.459		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 08:05.01.308		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 08:10.02.066		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 08:15.01.459		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 08:20.01.278		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 08:25.01.676		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 08:30.01.321		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 08:35.01.323		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 08:40.01.349		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 08:45.01.460		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 08:50.01.521		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 08:55.01.610		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 09:00.01.435		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 09:05.02.057		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 09:10.01.251		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 09:15.01.359		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 09:20.01.255		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 09:25.01.315		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 09:30.01.241		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 09:35.01.287		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 09:40.01.337		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 09:45.01.565		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 09:50.01.382		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 09:55.01.373		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 10:00.01.355		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 10:05.01.388		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 10:10.01.225		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 10:15.01.295		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 10:20.01.280		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 10:25.02.413		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 10:30.04.571		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 10:35.01.357		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 10:40.01.293		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 10:45.01.621		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 10:50.02.241		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 10:55.01.222		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 11:00.01.229		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 11:05.01.577		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 11:10.01.226		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 11:15.01.249		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 11:20.01.246		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 11:25.01.259		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 11:30.01.394		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 11:35.01.392		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 11:40.04.606		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 11:45.01.458		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 11:50.01.189		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 11:55.01.684		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 12:00.01.247		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 12:05.01.391		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 12:10.02.050		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 12:15.01.211		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 12:20.01.279		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 12:25.01.697		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 12:30.01.463		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 12:35.01.398		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 12:40.01.236		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 12:45.01.488		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 12:50.02.028		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 12:55.01.469		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 13:00.01.310		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 13:05.02.345		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 13:10.01.354		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 13:15.01.292		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 13:20.01.319		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 13:25.01.332		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 13:30.01.555		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 13:35.02.042		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 13:40.01.237		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 13:45.01.272		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 13:50.01.423		Flow [0-4] Wie voert de kat: nummer 1  
2021-03-18 13:55.01.191		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 14:00.01.302		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 14:05.01.789		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 14:10.01.397		Flow [0-4] Wie voert de kat: nummer 4  
2021-03-18 14:15.01.405		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 14:20.01.233		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 14:25.01.868		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 14:30.01.363		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 14:35.01.339		Flow [0-4] Wie voert de kat: nummer 2  
2021-03-18 14:40.01.372		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 14:45.01.900		Flow [0-4] Wie voert de kat: nummer 3  
2021-03-18 14:46.21.471		Flow [0-4] Wie voert de kat: nummer 2

So, is it possible to test with 0.5 to 4.5 like I said? Because what I predicted seems to happen, the first and last have approx. half the chance. If you cannot use fractions as the start and end, then you should use truncation, not rounding. That, and you should test way more times for the values to truly converge.

Should be 0.5 and 4.499999 by the way, otherwise there’s a chance you’ll get 5.

Your version seems like a fine way to determine who feeds the cat though, as long as it is Mom, daughter, son, dad :wink:

Did a little test myself, now with the right range. The delays are to prevent Homey from killing the flow for running too often and to make sure the calculation is done when the result is counted:

After 825 steps the division is: 197/212/205/211 and that is not that bad for this low a testcount. After 8782 steps the division is 2217/2163/2169/2233. Again, pretty good. So my conclusion is: if you do the range right, there’s nothing wrong with the random function. @Peter_Kawa, hope your family will now be able to trust Homey to pick who’ll feed the cat, and @Dalle do these flows give you enough of an idea how to build your announcements?

It will probably look something like this If you do not want to delay the announcement itself:

Flow 1: if this flow was started then let TextToSpeach cast variable NextAnnouncementText to a chromecast device,
and calculate variable NextAnnouncement to {{round(random(0.5,4.4999))}} with a delay of a 5 seconds

Flow 2: If variable NextAnnouncement changes and NextAnnouncement equals 1 then set variable NextAnnouncementText to text1

Flow 3: If variable NextAnnouncement changes and NextAnnouncement equals 2 then set variable NextAnnouncementText to text2

Flow 4: If variable NextAnnouncement changes and NextAnnouncement equals 3 then set variable NextAnnouncementText to text3

Flow 5: If variable NextAnnouncement changes and NextAnnouncement equals 4 then set variable NextAnnouncementText to text4

Note that the very first time you’ll have to set the text yourself or run the first flow once more, as the next announcement text is determined 5 seconds after the announcement was made. These delays are needed because Homey runs all cards at the same time and things may not happen in the right order. I used 5 seconds because I thought text to speach and casting would take some time, but you can probably safely set the delay much lower because the variable will probably be used only at the very start of the texttospeach card.

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Just add the action card for letting Homey say something and use “;” between the different announcements. “Text 1;text2;text3;text4”

Then make a second flow “IF Homey said something” and send the tag to TTS.

Maybe add an extra variable so it only works on this specific flow if you don’t want to transmit anything else that Homey is saying.

Hi and thanks for the examples, I will try this later today and see if I can understand how et works.
I´am new to the logic part so I will see if I can understand how to get the tts flows to be incorporated. :slight_smile:

Sorry but I´am not sure of how to setup the ransom flows that it should be executing.

Have you looked at the test flows I shared? All the building blocks are there to create the random text. The actual flows you need to build your original question are below in text.
Maybe looking at the tutorial Getting Started - Logic variables will help you on your way how to create the cards you need.

Thanks I will check it out, and thanks for the link that will should hopefully give me a better understanding of how things work.

Why all the work with all the different flows and logic when you could easily do it with 1 extra flow? Or am I missing the point here? :eyes:

I cannot speak for the poster, but I wouldn’t want to have the announcement twice. One of which is in the wrong place, close to a kids bedroom.
The other reason is that picking something at random is a useful thing to be able to for other applications as well. So learning about that is useful for other things too, when it is not logical to have homey speak to get things done.

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Hi again I have finally got it to function, hurray my first flow with logic cards and variables :blush:
But it is a lot of flows to create for this type of functionality.
It would have been great if there was a card that could just choose from a list of flows that you give it.
Thanks a lot for your help. :blush:

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You’re welcome. Homey often requires more flows. It is a consequence of how they designed it to be both simple, powerful and efficient at the same time. The trick is not to worry too much about it, but organize them nicely in folders and use descriptive nam3s.

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