G'day,
Having a couple of issues getting my msg.payload to display as a value on my guage. I think I'm missing something faily simple.
Im running a loadcell through a HX711 into my arduino and using a serial node to display the data in nodered, I can display it as a numeric value but am unable to represent the data on a gauge.
![Node%20Red%20Nodes](https://global.discourse-cdn.com/business6/uploads/nodered/original/2X/7/7a56b6eeb69a5843ba432415a6e4b5cbb40d3323.png)
![Node%20Red%20UI](https://global.discourse-cdn.com/business6/uploads/nodered/original/2X/d/d68f3f1494b029489ff9c4d9bc359121e775c776.png)
what does the debug node show?
So you can’t send a string “weight : -0.35⏎"
to a gauge.
You would need to strip out the text and probably the ⏎ which you should be able to do with a change node (change the rule drop down to "Change"
Alternative alter your arduino code to send JSON which an be easily converted into a Javascript object with the JSON node
I did try the change node earlier, I don't quite understand how it works. I might need to do some research into it. This is what i have tried
search for the bit you want to remove
i.e. the text bit
Replace with what you want to replace it with
i.e. nothing
You are trying to end up with a payload that is "0.26"
which although it is still a string (text) rather than being a value (number) the gauge should display.
1 Like
You need to get the number from the line of text
Send the payload to function
node.
In that function
node:
msg.payload = parseFloat(msg.payload)
return msg
And then feed it to the gauge
node (and may be to debug
node to see if value is correct)
https://www.w3schools.com/jsref/jsref_parsefloat.asp
Cheers mate, solved the problem, Seems pretty simple now ![:blush: :blush:](https://emoji.discourse-cdn.com/twitter/blush.png?v=9)