Debug to Gauge Node

[Rawbutter]

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.

[ukmoose]

what does the debug node show?

[Rawbutter]

[ukmoose]

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

[Rawbutter]

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

[ukmoose]

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.

[hotNipi]

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

[Rawbutter]

Cheers mate, solved the problem, Seems pretty simple now