How to choose the highest temperature value in 8x8 array of amg8833 and display it on the dashboard?

asyrahshah · 21 January 2022 07:53

Hi, i have a problem in writing the function to display only the highest value in the 8x8 array of AMG8833. below is my currently dashboard. but for the temperature reading value is not correct. I want to display on the temperature reading value the highest temperature that is display on the 8x8 array of thermal imaging.

here is my function for the temperature reading.

Steve-Mcl · 21 January 2022 07:58

Please show us the data used to render the thermal image

Better still, use the "copy value" button on the debug to grab the actual values as text & share your flow.

asyrahshah · 21 January 2022 08:07

asyrahshah · 21 January 2022 08:08

the flow of my node

Steve-Mcl · 21 January 2022 08:10

Unfortunately, I can not use pictures to re-create (or solve) your problem.

For a flow - Use the node-red export feature (CTRL+E)
for data in a debug message - use the "copy value" button on the debug message property

See this post for more details - How to share code or flow json

E1cid · 21 January 2022 08:15

Try something like this

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asyrahshah · 21 January 2022 08:23

sorry.. here is my node flow

asyrahshah · 21 January 2022 08:24

sorry im still new to this...

asyrahshah · 21 January 2022 08:27

where should i put this?

E1cid · 21 January 2022 08:30

where ever you wish. You feed the array into the change node, the change node outputs the highest value.

Ps your flow json is corrupt , you need to paste the code between backtickd
eg
```
paste code here
```

Steve-Mcl · 21 January 2022 08:30

Please☝️read this - your posted flow is not valid/importable

In order to make code more readable and importable it is important to surround your code with three backticks
```
like this
```

You can edit and correct your post by clicking the pencil icon.

asyrahshah · 21 January 2022 08:52

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width=\\\"40px\\\" height=\\\"40px\\\" align=\\\"center\\\" valign=\\\"middle\\\"><font size=\\\"2\\\" color= \\\"#CCCCCC\\\">\"+temp+\"</font></td>\"\n    }\n    html = html + \"</tr>\"\n}\n\nhtml = html + \"</table>\"\n\nmsg.payload = html;\n\nreturn [msg,{\"payload\":MINTEMP},{\"payload\":MAXTEMP}];","outputs":3,"noerr":0,"initialize":"","finalize":"","libs":[],"x":400,"y":440,"wires":[["a3c4087e.bc2c28","ce18a3aa.bdd22"],[],[]]},{"id":"a3c4087e.bc2c28","type":"debug","z":"948243a3.6a4c2","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":650,"y":460,"wires":[]},{"id":"ce18a3aa.bdd22","type":"ui_template","z":"948243a3.6a4c2","group":"38a41d52.5ca782","name":"","order":1,"width":"8","height":"10","format":"<div 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Steve-Mcl · 21 January 2022 09:09

Hi, there was really no need to post your entire flow - a cut down demo would suffice. You also didn't provide sample data.

never mind.

Here is a demo I knocked up

[{"id":"b20b0bace1cb8757","type":"function","z":"23a4d2dd73b6359f","name":"min max","func":"\nconst image = msg.payload.split(\",\");\nconst data = image.map(e => parseFloat(e) + 5.0);\nconst min = Math.min(...data);\nconst max = Math.max(...data);\n\nmsg.payload = {\n    min: min,\n    max: max\n}\n\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":640,"y":320,"wires":[["b1c2ac35c45cb973"]]},{"id":"7926e8b8790cd901","type":"function","z":"23a4d2dd73b6359f","name":"min and max separate","func":"\nconst image = msg.payload.split(\",\");\nconst data = image.map(e => parseFloat(e) + 5.0);\nconst min = Math.min(...data);\nconst max = Math.max(...data);\n\nreturn [{ payload: min }, { payload: max }];","outputs":2,"noerr":0,"initialize":"","finalize":"","libs":[],"x":680,"y":380,"wires":[["d2213c2210e09113"],["1b5e47b734bfecf6"]]},{"id":"26f4abce7d70d21c","type":"inject","z":"23a4d2dd73b6359f","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"30,20,40,33,44,26,27","payloadType":"str","x":440,"y":320,"wires":[["b20b0bace1cb8757","7926e8b8790cd901"]]},{"id":"b1c2ac35c45cb973","type":"debug","z":"23a4d2dd73b6359f","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","statusVal":"payload","statusType":"auto","x":910,"y":320,"wires":[]},{"id":"d2213c2210e09113","type":"debug","z":"23a4d2dd73b6359f","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","statusVal":"payload","statusType":"auto","x":910,"y":380,"wires":[]},{"id":"1b5e47b734bfecf6","type":"debug","z":"23a4d2dd73b6359f","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","statusVal":"payload","statusType":"auto","x":910,"y":440,"wires":[]}]

NOTE: for anyone looking at the image and thinking 25 is not the min - the OP had a formula to add 5.0 to the value. I included this in the demo (remove that if not required)

jbudd · 21 January 2022 09:16

This seems to be the function node that feeds your gauge:

let image = msg.payload.split(",");
// auto calculate min and max
//MINTEMP = 200.0;
//MAXTEMP = 32.0;
for (let k=0;k<=64;k++) {
    value = parseFloat(image[k-1])+5.0;  
}
return [msg,{"payload":value}];

I think you are trying to loop through all the values in the array, but you don't do anything with the measurements, so the value passed to the gauge comes from the last array element.

But your other function "Render image" does record MINTEMP and MAXTEMP. Why can't you send MAXTEMP to your gauge?

Edit - Looking at the picture you posted, I would expect the gauge to show 40.75 (35.75 + 5.0) so either I'm misunderstanding the code or else that picture is from an earlier attempt at the code.

And I suspect that

for (let k=0;k<=64;k++) {
    value = parseFloat(image[k-1])+5.0;  
}

would be better as

for (let k=0;k<64;k++) {
    value = parseFloat(image[k])+5.0;  
}

asyrahshah · 21 January 2022 09:27

thank you.. i got it already

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