Calculating Time / Washing Machine Notification

General
1

Hey Guys!
Im trying to get a notification 10 minutes before my washing machine is finishing. There was a remaining time sensor in the past (siemens home connect) but it isn't there anymore. The only sensor left, is a sensor with shows the actual end time of the program. So I put in a current state node and the payload is: 2021-11-03T14:07:53.797900+00:00. I thought about calculating the time difference between the time now and the programm end time and substract 10 minutes. What do you think? Is there a more convenient way to archive this or how would you do that?

Regards

2

You can use the Trigger node and pass in a delay in milliseconds. So you need to do the calculation to convert now - washingEnd into ms. You can do that in a function node or in a change node using JSONata. Send the resulting delay ms to the Trigger node and it will send a msg when the delay time expires.

If you are comfortable with JavaScript, you could also do it all in a function node using a setTimeout function.

1 Like
3

Or
A delay node set to use msg.delay as input then use a simle JSONata expression to calculate the delay
e.g.

[{"id":"3a357922.18ca1e","type":"inject","z":"b779de97.b1b46","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"2021-11-03T11:10:00.000000+00:00","payloadType":"str","x":160,"y":4840,"wires":[["586bd900.831e58"]]},{"id":"586bd900.831e58","type":"change","z":"b779de97.b1b46","name":"","rules":[{"t":"set","p":"delay","pt":"msg","to":"$toMillis($$.payload) - $millis() - 600000","tot":"jsonata"},{"t":"set","p":"payload","pt":"msg","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":340,"y":4860,"wires":[["ff4bd691.5eb148"]]},{"id":"ff4bd691.5eb148","type":"delay","z":"b779de97.b1b46","name":"","pauseType":"delayv","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":580,"y":4840,"wires":[["1e2cb213.f6f5be"]]},{"id":"1e2cb213.f6f5be","type":"debug","z":"b779de97.b1b46","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":560,"y":4940,"wires":[]}]

$toMillis($$.payload) - $millis() - 600000

set timestamp in inject to test

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4

I'm not familiar with coding at all. Just took snippets from here and adjusted them to my needs :-).

First question is how can i calculate the time: "payload time" - "now". In minutes or miliseconds? what is easier to do? So I imagine if the washer is finishing at 16.00 and now it is 14.00 then the result should be 120 minutes difference. And then the flow goes and somehow sends a notification if the value is 10?

Thank you

5

My example calculates how many milliseconds until 10 minutes before stop time. that figure is then used in delay/trigger node to delay message for that set amount of milliseconds.

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6

Hmm. Okay sorry I didn't fully understand what's going on there. Tried it like this:

Bildschirmfoto 2021-11-03 um 12.49.35
Bildschirmfoto 2021-11-03 um 12.49.353010Ă—1186 435 KB

Okay! the delay value is the value in ms until 10minutes before end? And this value sets the delay node to exact 10min before machine end?

7

You need to post the exported flow along with a inject node that contains the incoming msg from the HA node. That image is like going to a mechanic and saying my engine is not working and not opening the bonnet(hood). We need to see the expression used and other settings to

8

Thank you. Tried to kind of reverse engineered your flow and I think it works :-).

Will try to tinker around a little bit!

9

Is $millis() the expression for the current time?

10

Yes in milliseconds

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11

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