# Sum function of two sensor data

**URL:** <https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761>\
**Category:** General\
**Created:** [2 June 2019 11:35 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761 "2019-06-02T11:35:49Z")\
**Posts on this page:** 13\
**Page:** 1

<div class="post-metadata">

**Author:** ![b3hzad2012](https://avatars.discourse-cdn.com/v4/letter/b/a9a28c/32.png) [@b3hzad2012](https://discourse.nodered.org/u/b3hzad2012)\
**Post date:** [2 June 2019 11:35 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/1 "2019-06-02T11:35:49Z")

</div>

I can't sum the numbers which are collected from sensors.

 ![Capture](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/1/166d1b44dbcc7ae47b9a67249bc42fdd1e6be42f.png)

```auto
 [{"id":"a451fd95.e588d","type":"tab","label":"IoT Imaginary","disabled":false,"info":""},{"id":"9c84ad2a.aa978","type":"http response","z":"a451fd95.e588d","name":"","statusCode":"","headers":{},"x":1470,"y":320,"wires":[]},{"id":"79a9e37d.36d9bc","type":"comment","z":"a451fd95.e588d","name":"Get information Users","info":"Get information from load sensor","x":160,"y":300,"wires":[]},{"id":"909b9546.22b4b8","type":"comment","z":"a451fd95.e588d","name":"Challenge number","info":"","x":130,"y":100,"wires":[]},{"id":"eedb0dc8.653a9","type":"http in","z":"a451fd95.e588d","name":"","url":"/target","method":"get","upload":false,"swaggerDoc":"","x":330,"y":100,"wires":[["ef3dd8b3.074008"]]},{"id":"589db0bc.c9874","type":"http response","z":"a451fd95.e588d","name":"","statusCode":"","headers":{},"x":750,"y":120,"wires":[]},{"id":"ef3dd8b3.074008","type":"template","z":"a451fd95.e588d","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"<!DOCTYPE html>\n<html>\n <body>\n <form action=\"/target\" method=\"post\">\n <input type=\"radio\" name=\"status\" value=\"100\"> 100 <br>\n <input type=\"radio\" name=\"status\" value=\"90\"> 90 <br>\n <input type=\"radio\" name=\"status\" value=\"80\"> 80\n <input type=\"submit\" value=\"Submit\">\n </form>\n \n </body>\n \n</html>","output":"str","x":540,"y":100,"wires":[["589db0bc.c9874"]]},{"id":"936222b4.80eb7","type":"switch","z":"a451fd95.e588d","name":"","property":"payload","propertyType":"msg","rules":[{"t":"btwn","v":"0","vt":"num","v2":"0.24","v2t":"num"},{"t":"btwn","v":"0.25","vt":"num","v2":"0.49","v2t":"num"},{"t":"btwn","v":"0.50","vt":"num","v2":"0.99","v2t":"num"},{"t":"btwn","v":"1","vt":"num","v2":"1.25","v2t":"num"},{"t":"else"}],"checkall":"true","repair":false,"outputs":5,"x":950,"y":320,"wires":[["fcb70e40.3976f"],["ced18342.3a5f4"],["ecfe2bbd.448148"],["e5492f8e.e7e38"],["4d71f88a.407eb8"]]},{"id":"fcb70e40.3976f","type":"change","z":"a451fd95.e588d","name":"5 Cigarettes","rules":[{"t":"set","p":"payload","pt":"msg","to":"5","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1230,"y":240,"wires":[["9c84ad2a.aa978"]]},{"id":"ced18342.3a5f4","type":"change","z":"a451fd95.e588d","name":"10 Cigarettes","rules":[{"t":"set","p":"payload","pt":"msg","to":"10","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1230,"y":280,"wires":[["9c84ad2a.aa978"]]},{"id":"ecfe2bbd.448148","type":"change","z":"a451fd95.e588d","name":"15 Cigarettes","rules":[{"t":"set","p":"payload","pt":"msg","to":"15","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1230,"y":320,"wires":[["9c84ad2a.aa978"]]},{"id":"e5492f8e.e7e38","type":"change","z":"a451fd95.e588d","name":"20 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request","z":"a451fd95.e588d","name":"","method":"GET","ret":"txt","paytoqs":false,"url":"http://localhost:1880/sensor/load/solo2","tls":"","proxy":"","authType":"basic","x":610,"y":620,"wires":[["b4e36c95.47f58","8221d996.bc3c78"]]},{"id":"8221d996.bc3c78","type":"ui_gauge","z":"a451fd95.e588d","name":"","group":"df0f0026.364d9","order":2,"width":0,"height":0,"gtype":"wave","title":"S02","label":"Cig","format":"{{value}}","min":0,"max":"20","colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":1020,"y":680,"wires":[]},{"id":"dc59a747.6fa558","type":"debug","z":"a451fd95.e588d","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":970,"y":440,"wires":[]},{"id":"4848ce9e.39aa4","type":"comment","z":"a451fd95.e588d","name":"Chart","info":"Change the weight of ashes to Number of cigarettes","x":190,"y":580,"wires":[]},{"id":"74fb5f4c.8164f","type":"ui_gauge","z":"a451fd95.e588d","name":"","group":"f48a683a.03ab88","order":3,"width":0,"height":0,"gtype":"wave","title":"S.01","label":"Cig","format":"{{value}}","min":0,"max":"20","colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":1040,"y":620,"wires":[]},{"id":"3f7e6862.2877d8","type":"random","z":"a451fd95.e588d","name":"","low":"0","high":"1.25","inte":"false","property":"payload","x":720,"y":380,"wires":[["936222b4.80eb7","dc59a747.6fa558"]]},{"id":"43622cad.c44734","type":"ui_gauge","z":"a451fd95.e588d","name":"","group":"fc70f4eb.d19968","order":1,"width":0,"height":0,"gtype":"wave","title":"S1+S2","label":"Cig","format":"{{value}}","min":0,"max":"100","colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":1270,"y":900,"wires":[]},{"id":"d8c36831.0a2eb8","type":"comment","z":"a451fd95.e588d","name":"sum the cigarettes","info":"","x":230,"y":760,"wires":[]},{"id":"3b0ee3f0.0e7f4c","type":"change","z":"a451fd95.e588d","name":"","rules":[{"t":"set","p":"var1","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":670,"y":760,"wires":[["4cbaa952.6aa0c8"]]},{"id":"f2db7303.c9f6a","type":"debug","z":"a451fd95.e588d","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","x":1250,"y":820,"wires":[]},{"id":"bbc6bae4.6ad6f8","type":"change","z":"a451fd95.e588d","name":"","rules":[{"t":"set","p":"var2","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":670,"y":820,"wires":[["4cbaa952.6aa0c8"]]},{"id":"5fa7cc2e.149b04","type":"http response","z":"a451fd95.e588d","name":"","statusCode":"","headers":{},"x":1210,"y":760,"wires":[]},{"id":"b7600d49.43634","type":"change","z":"a451fd95.e588d","name":"sum","rules":[{"t":"set","p":"payload","pt":"msg","to":"$flowContext('var1')+$flowContext('var2')","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":1010,"y":760,"wires":[["5fa7cc2e.149b04","f2db7303.c9f6a","43622cad.c44734"]]},{"id":"4cbaa952.6aa0c8","type":"join","z":"a451fd95.e588d","name":"","mode":"auto","build":"string","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":false,"timeout":"","count":"","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":830,"y":760,"wires":[["b7600d49.43634"]]},{"id":"480bc06f.d1d71","type":"http in","z":"a451fd95.e588d","name":"","url":"/sensor/load/solo2","method":"get","upload":false,"swaggerDoc":"","x":440,"y":820,"wires":[["bbc6bae4.6ad6f8"]]},{"id":"84a182d8.e8c34","type":"http in","z":"a451fd95.e588d","name":"","url":"/sensor/load/solo1","method":"get","upload":false,"swaggerDoc":"","x":440,"y":760,"wires":[["3b0ee3f0.0e7f4c"]]},{"id":"df0f0026.364d9","type":"ui_group","z":"","name":"Chart Solo 02","tab":"671e00e4.f26dd","order":2,"disp":true,"width":"6","collapse":false},{"id":"f48a683a.03ab88","type":"ui_group","z":"","name":"Chart Solo 01","tab":"671e00e4.f26dd","order":1,"disp":true,"width":"6","collapse":false},{"id":"fc70f4eb.d19968","type":"ui_group","z":"","name":"S1+S2","tab":"671e00e4.f26dd","order":3,"disp":true,"width":"6","collapse":false},{"id":"671e00e4.f26dd","type":"ui_tab","z":"","name":"Home","icon":"dashboard","disabled":false,"hidden":false}]

```

---

<div class="post-metadata">

**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [2 June 2019 12:05 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/2 "2019-06-02T12:05:18Z")

</div>

Unfortunately your flow isn't currently importable.Please read the following post [How to share code or flow json](https://discourse.nodered.org/t/how-to-share-code-or-flow-json/506) and then edit the above message.

Take a look at the cookbook that might have an example that helps... [http://cookbook.nodered.org](http://cookbook.nodered.org)

---

<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [2 June 2019 12:58 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/3 "2019-06-02T12:58:47Z")

</div>

There are a few ways to do this. I believe the `join` node will work however my preferred method is to store the values in flow context & then when any one changes, pull them both back from flow context & add them together.

---

<div class="post-metadata">

**Author:** ![b3hzad2012](https://avatars.discourse-cdn.com/v4/letter/b/a9a28c/32.png) [@b3hzad2012](https://discourse.nodered.org/u/b3hzad2012)\
**Post date:** [2 June 2019 16:27 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/4 "2019-06-02T16:27:35Z")

</div>

Unfortunately, my major is product design and I'm not familiar with the node red environment. In fact, the university has forced on to work on this project

---

<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [2 June 2019 16:36 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/5 "2019-06-02T16:36:35Z")

</div>

have you tried anything?

Have you tried a join node to see what happens?

Have you read up on [context](https://nodered.org/docs/user-guide/context)?

Lastly, have you searched this forum? There are many examples.

Heres one i adapted slightly...

```auto
[{"id":"123c9490.2e5d7b","type":"ui_numeric","z":"80855e36.822e4","name":"","label":"User input","tooltip":"","group":"3a2a4dcc.dcbe52","order":2,"width":0,"height":0,"passthru":true,"topic":"","format":"{{value}}","min":0,"max":"65535","step":1,"x":132,"y":419,"wires":[["7bfa89f5.6cd918"]]},{"id":"52d1cae0.928e64","type":"ui_text","z":"80855e36.822e4","group":"3a2a4dcc.dcbe52","order":3,"width":0,"height":0,"name":"","label":"Result","format":"{{msg.payload}}","layout":"row-spread","x":670,"y":400,"wires":[]},{"id":"897f5f4f.ba462","type":"change","z":"80855e36.822e4","name":"","rules":[{"t":"set","p":"val1","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":290,"y":360,"wires":[["8f1ffaa.e986308"]]},{"id":"8f1ffaa.e986308","type":"function","z":"80855e36.822e4","name":"add","func":"var val1 = parseInt(flow.get(\"val1\") || \"0\");\nmsg.payload = parseInt(flow.get(\"val2\") || \"0\") + val1;\nreturn msg;","outputs":1,"noerr":0,"x":530,"y":400,"wires":[["52d1cae0.928e64"]]},{"id":"7bfa89f5.6cd918","type":"change","z":"80855e36.822e4","name":"","rules":[{"t":"set","p":"val2","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":290,"y":420,"wires":[["8f1ffaa.e986308"]]},{"id":"a5bad124.1f4b9","type":"ui_numeric","z":"80855e36.822e4","name":"","label":"User input","tooltip":"","group":"3a2a4dcc.dcbe52","order":2,"width":0,"height":0,"passthru":true,"topic":"","format":"{{value}}","min":0,"max":"65535","step":1,"x":130,"y":360,"wires":[["897f5f4f.ba462"]]},{"id":"3a2a4dcc.dcbe52","type":"ui_group","z":"","name":"Default","tab":"7a83039f.32968c","disp":true,"width":"6","collapse":false},{"id":"7a83039f.32968c","type":"ui_tab","z":"","name":"Home","icon":"dashboard"}]

```

**edit...**  
This example requires node-red-dashboard  
Steps to use it...

1. Press CTRL+I (to open the import dialog)
2. Paste the code in
3. Deploy.
4. Press CTRL+SHIFT+D to access the dashboard

---

<div class="post-metadata">

**Author:** ![b3hzad2012](https://avatars.discourse-cdn.com/v4/letter/b/a9a28c/32.png) [@b3hzad2012](https://discourse.nodered.org/u/b3hzad2012)\
**Post date:** [2 June 2019 16:45 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/6 "2019-06-02T16:45:46Z")

</div>

I've read this:

> [@How to do a simple sum of 2 msgs](https://discourse.nodered.org/t/how-to-do-a-simple-sum-of-2-msgs/5382):
>
> Hello, Im working in my final paper and I find myself in a situation I cant solve a simple sum of two mqtt messages. Could someone help-me?

but it doesn't work.

 ![Capture](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/2/2c1ecc16f415420b923707ea2bd071da310e6d73.png)  
How can I use it?

```auto
[{"id":"123c9490.2e5d7b","type":"ui_numeric","z":"80855e36.822e4","name":"","label":"User input","tooltip":"","group":"3a2a4dcc.dcbe52","order":2,"width":0,"height":0,"passthru":true,"topic":"","format":"{{value}}","min":0,"max":"65535","step":1,"x":132,"y":419,"wires":[["7bfa89f5.6cd918"]]},{"id":"52d1cae0.928e64","type":"ui_text","z":"80855e36.822e4","group":"3a2a4dcc.dcbe52","order":3,"width":0,"height":0,"name":"","label":"Result","format":"{{msg.payload}}","layout":"row-spread","x":670,"y":400,"wires":[]},{"id":"897f5f4f.ba462","type":"change","z":"80855e36.822e4","name":"","rules":[{"t":"set","p":"val1","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":290,"y":360,"wires":[["8f1ffaa.e986308"]]},{"id":"8f1ffaa.e986308","type":"function","z":"80855e36.822e4","name":"add","func":"var val1 = parseInt(flow.get(\"val1\") || \"0\");\nmsg.payload = parseInt(flow.get(\"val2\") || \"0\") + val1;\nreturn msg;","outputs":1,"noerr":0,"x":530,"y":400,"wires":[["52d1cae0.928e64"]]},{"id":"7bfa89f5.6cd918","type":"change","z":"80855e36.822e4","name":"","rules":[{"t":"set","p":"val2","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":290,"y":420,"wires":[["8f1ffaa.e986308"]]},{"id":"a5bad124.1f4b9","type":"ui_numeric","z":"80855e36.822e4","name":"","label":"User input","tooltip":"","group":"3a2a4dcc.dcbe52","order":2,"width":0,"height":0,"passthru":true,"topic":"","format":"{{value}}","min":0,"max":"65535","step":1,"x":130,"y":360,"wires":[["897f5f4f.ba462"]]},{"id":"3a2a4dcc.dcbe52","type":"ui_group","z":"","name":"Default","tab":"7a83039f.32968c","disp":true,"width":"6","collapse":false},{"id":"7a83039f.32968c","type":"ui_tab","z":"","name":"Home","icon":"dashboard"}]

```

---

<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [2 June 2019 16:48 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/7 "2019-06-02T16:48:55Z")

</div>

> [@b3hzad2012](#):
>
> How can I use it?

Use what? The flow you posted is the one I posted 5 mins ago.

> [@Steve-Mcl](#):
>
> Steps to use it...
> 
> 1. Press CTRL+I (to open the import dialog)
> 2. Paste the code in
> 3. Deploy.
> 4. Press CTRL+SHIFT+D to access the dashboard

Use it like that ^

Or take the functioning parts and adapt them into your flow. I dont understand what you want?

---

<div class="post-metadata">

**Author:** ![b3hzad2012](https://avatars.discourse-cdn.com/v4/letter/b/a9a28c/32.png) [@b3hzad2012](https://discourse.nodered.org/u/b3hzad2012)\
**Post date:** [2 June 2019 16:59 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/8 "2019-06-02T16:59:30Z")

</div>

I have two sensors. Each of them gives numbers between 0-1.25. Then I've changed them to numbers between 0-25. I have a chart for each sensor and now I need the chart which shows the sum of these two.

 ![Capture](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/5/5528d3cb39a8d8ab9bed3efaebb998eaa691a6a5.png)

---

<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [2 June 2019 17:06 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/9 "2019-06-02T17:06:04Z")

</div>

So where you get the value for gauge1 and gauge2, connect them also into the "set val1" and "set val2" nodes I provided. Then connect the output of the `add` function to your gauge3?

All the pieces are there - give it a go.

---

<div class="post-metadata">

**Author:** ![b3hzad2012](https://avatars.discourse-cdn.com/v4/letter/b/a9a28c/32.png) [@b3hzad2012](https://discourse.nodered.org/u/b3hzad2012)\
**Post date:** [2 June 2019 17:08 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/10 "2019-06-02T17:08:53Z")

</div>

It Works!!! Thanks 😍😍😍

---

<div class="post-metadata">

**Author:** ![cwein87](https://avatars.discourse-cdn.com/v4/letter/c/b38774/32.png) [@cwein87](https://discourse.nodered.org/u/cwein87)\
**Post date:** [4 February 2022 12:59 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/11 "2022-02-04T12:59:46Z")

</div>

Thanks Steve - it work's like charm! 🙂

One question: I added six values, the debug now sends six times the same value.. is there a solution to that?

---

<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [4 February 2022 13:51 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/12 "2022-02-04T13:51:50Z")

</div>

Hi @cwein87 welcome to the forum.

That post is over 3 years old. A lot has changed in that time.

Please start a new thread detailing what you have done & what you are seeing.  
Ensure the title is descriptive to draw the correct attension (e.g. "I have a problem" is not a good title. "How can 6 values in separate messages be added together" is a good title)

closing this old thread.

---

<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [4 February 2022 13:51 UTC](https://discourse.nodered.org/t/sum-function-of-two-sensor-data/11761/13 "2022-02-04T13:51:56Z")

</div>