Subjecting 2 msg.payload

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niels-yvo grummel

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May 7, 2018, 6:01:16 AM5/7/18
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I need to know how i can subject 2 msg.payload variable values from eachother. and this has to become a 3 variable value.
all 3 values need to be seen in the dashboard. 

If anyone could help me i'll would be so grateful.

Kindregarts Niels-Yvo Grummel 

Zenofmud

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May 7, 2018, 6:18:01 AM5/7/18
to javier.corado via Node-RED
A little more detail would be useful...
1) are these variables in two different msg’s or are the both in the same msg?
2) what type of variables are they? strings? arrays? numbers?
3) what have you tried so far?
4) what does the data look like? (copy and paste the actual data)
5)how are the variables to be combined? 

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niels-yvo grummel

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May 7, 2018, 7:20:29 AM5/7/18
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Okay so i am using 2 different msg.payload's .
the variables are number that give a a value of 5 at each pulse.
if tried renaming a msg.payload, as well using a formula in a fuction, combinining stuff from the internet. yet nothings seems to work for me ( been sitting on this for the past 3 days)
and the formula is realy easy. 
X2-X1=X3
where X1 is the first value that comes in
and X2 the second one.



7-5-2018 13:15:07node: de2e22da.508d5msg.payload : number
5
7-5-2018 13:15:07node: de2e22da.508d5msg.payload : number
10
7-5-2018 13:15:08node: d672cc76.5a6c1msg.payload : number
5
7-5-2018 13:15:08node: d672cc76.5a6c1msg.payload : number
10
7-5-2018 13:15:09node: d672cc76.5a6c1msg.payload : number
15
7-5-2018 13:15:09node: d672cc76.5a6c1msg.payload : number
20
7-5-2018 13:15:16node: de2e22da.508d5msg.payload : number
15
7-5-2018 13:15:16node: de2e22da.508d5msg.payload : number
20
7-5-2018 13:15:16node: de2e22da.508d5msg.payload : number
25
7-5-2018 13:15:16node: de2e22da.508d5msg.payload : number
30
7-5-2018 13:15:16node: d672cc76.5a6c1msg.payload : number
25
7-5-2018 13:15:16node: d672cc76.5a6c1msg.payload : number
30
7-5-2018 13:15:17node: d672cc76.5a6c1msg.payload : number
35
7-5-2018 13:15:17node: d672cc76.5a6c1msg.payload : number
40\
and a screenshot of the dashboard



Op maandag 7 mei 2018 12:18:01 UTC+2 schreef Paul Woodard:
dash_scrn.png

niels-yvo grummel

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May 7, 2018, 7:22:00 AM5/7/18
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Okay so the Rain water is X3  so rainwater should be 20

Op maandag 7 mei 2018 13:20:29 UTC+2 schreef niels-yvo grummel:

Zenofmud

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May 7, 2018, 7:38:07 AM5/7/18
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So how do you tell msg 1 from msg 2? i.e looking at your data (reading top to bottom) msg arrives with 5 then a message arrives with 10 and you want to add these to get 15, but then another msg arrives with a 5. Does this mean that the msg with 10 is now counted as the first msg or is the new 5 the first msg?

are the msgs coming from different inputs? (having the complete flow is helpful)

You probably want to have a ‘join’ node that will wait for the two messages to arrive and it will combine then. you can then pass the single msg with both values to your function for processing.

Paul


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<dash_scrn.png>

niels-yvo grummel

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May 7, 2018, 7:49:46 AM5/7/18
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Telling them apart is the problem. else i could judt do a simple code line. and the reason you see 5 is cause 1 button press gives 2 pulse's so to make a total of 10 the each give 5 by press and 5 by releas = 10.
and they are from a diffrent pulse 

Op maandag 7 mei 2018 13:38:07 UTC+2 schreef Paul Woodard:

Zenofmud

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May 7, 2018, 8:48:51 AM5/7/18
to javier.corado via Node-RED
So you have two buttons. The buttons must each trigger a node of some sort …correct.

Please export your flow and attach it to a reply so I’ll have some idea what you are actually doing 
editor->top right->hamburger menu (the three lines)->Export->to clipboard->copy->paste in a reply

niels-yvo grummel

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May 7, 2018, 8:56:52 AM5/7/18
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[{"id":"a8ae5945.216dc8","type":"link out","z":"4019ed6.52b8114","name":"Drink_Water","links":["79468677.d40038","d3dad4a3.ebaed8","11b18fcd.6206"],"x":1135,"y":100,"wires":[]},{"id":"66b9ae5c.735c1","type":"link out","z":"4019ed6.52b8114","name":"Water_Gebruik","links":["5ff37763.577448","d6827eb1.70c5e","4989dee.3f7352"],"x":1135,"y":220,"wires":[]},{"id":"79468677.d40038","type":"link in","z":"4019ed6.52b8114","name":"Drink_water_1.1","links":["a8ae5945.216dc8"],"x":95,"y":520,"wires":[["16f5f4c.2db140b"]]},{"id":"5ff37763.577448","type":"link in","z":"4019ed6.52b8114","name":"Water_Gebruik_1.1","links":["66b9ae5c.735c1"],"x":95,"y":700,"wires":[["d89b5e67.bdfe9"]]},{"id":"c9fcbfaf.c006a","type":"counter","z":"4019ed6.52b8114","name":"Counter 3=10L","init":"5","step":"10","lower":"1","upper":"","mode":"increment","outputs":"1","x":720,"y":220,"wires":[["66b9ae5c.735c1"]]},{"id":"7968fba0.bcfb94","type":"counter","z":"4019ed6.52b8114","name":"Counter 2=10L","init":"5","step":"10","lower":"1","upper":"","mode":"increment","outputs":"1","x":720,"y":100,"wires":[["a8ae5945.216dc8"]]},{"id":"16f5f4c.2db140b","type":"counter","z":"4019ed6.52b8114","name":"counter_Drink","init":"0","step":"5","lower":"","upper":"","mode":"increment","outputs":1,"x":580,"y":520,"wires":[["de2e22da.508d5","4ebc3cf0.f031b4"]]},{"id":"d89b5e67.bdfe9","type":"counter","z":"4019ed6.52b8114","name":"counter_gebruik","init":"0","step":"5","lower":"","upper":"","mode":"increment","outputs":1,"x":560,"y":700,"wires":[["d672cc76.5a6c1","15460d45.ddc8a3"]]},{"id":"26e428cd.6cb558","type":"comment","z":"4019ed6.52b8114","name":"Drinking Water","info":"","x":160,"y":60,"wires":[]},{"id":"12d42a78.f1b736","type":"comment","z":"4019ed6.52b8114","name":"Water Usage","info":"","x":170,"y":180,"wires":[]},{"id":"5c76e09c.33314","type":"rpi-gpio in","z":"4019ed6.52b8114","name":"Drink","pin":"13","intype":"down","debounce":"25","read":false,"x":190,"y":100,"wires":[["7968fba0.bcfb94"]]},{"id":"6faa27e7.f64878","type":"rpi-gpio in","z":"4019ed6.52b8114","name":"Usage","pin":"15","intype":"down","debounce":"25","read":false,"x":190,"y":220,"wires":[["c9fcbfaf.c006a"]]},{"id":"8ffd4473.a9b5c8","type":"rpi-gpio in","z":"4019ed6.52b8114","name":"Rainwater","pin":"7","intype":"down","debounce":"25","read":false,"x":180,"y":320,"wires":[["85cfa96e.cfe0e8"]]},{"id":"85cfa96e.cfe0e8","type":"link out","z":"4019ed6.52b8114","name":"test1","links":["efd33294.a2ba1"],"x":1135,"y":320,"wires":[]},{"id":"de2e22da.508d5","type":"debug","z":"4019ed6.52b8114","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":1230,"y":600,"wires":[]},{"id":"d672cc76.5a6c1","type":"debug","z":"4019ed6.52b8114","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":1230,"y":780,"wires":[]},{"id":"4ebc3cf0.f031b4","type":"ui_text","z":"4019ed6.52b8114","group":"ab3af1cb.8d932","order":0,"width":0,"height":0,"name":"","label":"Drining Water ","format":"{{msg.payload}}","layout":"row-left","x":1240,"y":520,"wires":[]},{"id":"15460d45.ddc8a3","type":"ui_text","z":"4019ed6.52b8114","group":"ab3af1cb.8d932","order":0,"width":0,"height":0,"name":"","label":"Water Usage","format":"{{msg.payload}}","layout":"row-left","x":1230,"y":700,"wires":[]},{"id":"eecc4b21.266ae8","type":"debug","z":"4019ed6.52b8114","name":"","active":true,"tosidebar":true,"console":true,"tostatus":true,"complete":"true","x":1130,"y":1180,"wires":[]},{"id":"73393e96.a533f","type":"comment","z":"4019ed6.52b8114","name":"Rain Water","info":"","x":180,"y":280,"wires":[]},{"id":"e7e28d4a.a3e6e","type":"ui_text","z":"4019ed6.52b8114","group":"ab3af1cb.8d932","order":0,"width":0,"height":0,"name":"Rain Water","label":"Rain Water","format":"{{msg.payload}}","layout":"row-left","x":1150,"y":1060,"wires":[]},{"id":"d6827eb1.70c5e","type":"link in","z":"4019ed6.52b8114","name":"Water_Gebruik_1.1","links":["66b9ae5c.735c1"],"x":95,"y":1180,"wires":[["a60f1726.284d78"]]},{"id":"11b18fcd.6206","type":"link in","z":"4019ed6.52b8114","name":"Drink_water_1.1","links":["a8ae5945.216dc8"],"x":95,"y":1060,"wires":[["ec6cbaf1.be9ec8"]]},{"id":"692fa31f.f40ebc","type":"comment","z":"4019ed6.52b8114","name":"Water Usage","info":"","x":110,"y":1140,"wires":[]},{"id":"23ed51e9.e82abe","type":"comment","z":"4019ed6.52b8114","name":"Drinking Water","info":"","x":100,"y":1020,"wires":[]},{"id":"a60f1726.284d78","type":"counter","z":"4019ed6.52b8114","name":"counter_Drink","init":"0","step":"5","lower":"","upper":"","mode":"increment","outputs":1,"x":280,"y":1180,"wires":[["94028e2f.8499d"]]},{"id":"ec6cbaf1.be9ec8","type":"counter","z":"4019ed6.52b8114","name":"counter_gebruik","init":"0","step":"5","lower":"","upper":"","mode":"increment","outputs":1,"x":280,"y":1060,"wires":[["94028e2f.8499d"]]},{"id":"94028e2f.8499d","type":"merge","z":"4019ed6.52b8114","name":"","timeout":"1","x":690,"y":1120,"wires":[["e7e28d4a.a3e6e","eecc4b21.266ae8"]]},{"id":"315496d9.3235ea","type":"debug","z":"4019ed6.52b8114","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":1230,"y":880,"wires":[]},{"id":"47b589e5.1c7968","type":"function","z":"4019ed6.52b8114","name":"Testing","func":"msg.payload = msg.payload + msg.payload\nreturn msg;","outputs":1,"noerr":0,"x":560,"y":880,"wires":[["315496d9.3235ea","fffd6685.721688"]]},{"id":"4989dee.3f7352","type":"link in","z":"4019ed6.52b8114","name":"Water_Gebruik_1.1","links":["66b9ae5c.735c1"],"x":95,"y":880,"wires":[["47b589e5.1c7968"]]},{"id":"fffd6685.721688","type":"ui_text","z":"4019ed6.52b8114","group":"ab3af1cb.8d932","order":0,"width":0,"height":0,"name":"Rain Water","label":"Rain Water","format":"{{msg.payload}}","layout":"row-left","x":1230,"y":840,"wires":[]},{"id":"ab3af1cb.8d932","type":"ui_group","z":"","name":"Water Level","tab":"8930cdf2.5376a","order":1,"disp":true,"width":"6","collapse":false},{"id":"8930cdf2.5376a","type":"ui_tab","z":"","name":"Water Level","icon":"dashboard","order":1}]

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Zenofmud

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May 7, 2018, 8:59:03 AM5/7/18
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Ok, did you ever fix the problem with the counter node from the other thread?

niels-yvo grummel

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May 7, 2018, 9:01:00 AM5/7/18
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Yes i did. it was never a problem for me.
but now i need to subtrect those values for my third value

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Zenofmud

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May 7, 2018, 9:01:24 AM5/7/18
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and what is the ‘merge’ node you are using?

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niels-yvo grummel

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May 7, 2018, 9:02:44 AM5/7/18
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that was just something i was trying but is doest work. forgot to delete it sorry


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Zenofmud

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May 7, 2018, 9:21:15 AM5/7/18
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so are you trying to combine the msgs from the different gpio’s?

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niels-yvo grummel

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May 7, 2018, 9:22:51 AM5/7/18
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yes 

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Zenofmud

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May 7, 2018, 9:40:10 AM5/7/18
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so add a change node to each flow (to add the requirements for the join node) then have the output of the two change nodes go to a join node. Then after you join the messages you can put them into your function to do what ever you want.

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niels-yvo grummel

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May 7, 2018, 9:45:24 AM5/7/18
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maybe to much to ask. but is it posiable you make a quick example?

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Zenofmud

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May 7, 2018, 9:51:15 AM5/7/18
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I’ll have to get back to you because I have to step out for a bit. But give it a try - have the change node assign the same ID to both msgs, set the count to 2 and the past as part 1 and part two. put debug nodes to the outputs to see what you get and then point them both at a join and have a debug attached to that too. I suggest you have the debug nodes display the complete msg object.

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Zenofmud

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May 7, 2018, 12:22:42 PM5/7/18
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So what have you come up wth?

niels-yvo grummel

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May 8, 2018, 2:49:05 AM5/8/18
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Right now i still trying stuff. nothing seemed to be working for me

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Nick O'Leary

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May 8, 2018, 5:06:33 AM5/8/18
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Hi,

let me start by clarifying what I think you're trying to do with this flow.

You have some type of sensor attached to a pair of GPIO pins, one is measuring 'Drinking water' and the other 'Water usage'. Each time one of those pins changes state you increment a corresponding counter. You display their values on a dashboard.

You then want to subtract one value from the other. It is this last step that is slightly tricky as each message is an independent event. You can't directly subtract two msg.payload values because you only have one msg at any particular time. When you receive a 'Drinking water' message it doesn't include any information about 'Water usage'.

To solve this there are two possible approaches. One is to use a Join node that will help combine separate messages into one. The other option is to use flow context to store the individual values so they can be retrieved later. For your scenario, I'd personally recommend the latter approach.

Here's a quick sketch of that:
--------------

[GPIO Node] --> [Counter] --> [Change: set flow.drinking to msg.payload] --> [Link Out]
                                                                         \-> [ui_text dashboard] 

[GPIO Node] --> [Counter] --> [Change: set flow.usage to msg.payload] --> [Link Out]
                                                                      \-> [ui_text dashboard]

[Link In] --> [Function: see below] --> [Whatever you want to do with the result]

---------------

They key thing is the Change nodes attached to each GPIO-triggered flow. They set a pair of flow context variables with the latest values of drinking water and water usage. They each then update their dashboard text widget, and then both link a third flow that does the maths you want.

The Function node in that third flow is able to access flow context to get both of the latest values and then calculate the result. That means it doesn't matter which of the GPIO nodes has triggered the flow (ie it doesn't matter what is in msg.payload at this point as we'll use what is in flow context)

    var drinking = flow.get('drinking');
  var usage = flow.get('usage');
  msg.payload = drinking - usage;
  return msg;


I've forgotten which you want to subtract from which, but I hope you can see how this works even if I've got them swapped by mistake.

Hope that helps

Nick

yes 

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niels-yvo grummel

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May 8, 2018, 5:19:10 AM5/8/18
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I'm going to give it a try. Thanks for your time

Op di 8 mei 2018 11:06 schreef Nick O'Leary <nick....@gmail.com>:
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niels-yvo grummel

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May 8, 2018, 6:05:21 AM5/8/18
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Nick you are my freaking hero. I dont know how to thank you. But Thanks SOOOO MUCh

Op maandag 7 mei 2018 12:01:16 UTC+2 schreef niels-yvo grummel:
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