RPM gauge not updating -

[djmkcaraudio-pixel]

I am testing Serial Studio with ESP-12E.
I send JSON data like {"RPM":3500} and {"RPM":1200}.
The Console shows values correctly, but the RPM gauge widget stays at 0.00.

Dataset settings:

• Title: RPM
• Frame Index: 1
• Unit: Rpm
• Widget: Gauge

Why is the gauge needle not updating even though the Console receives the values?

[alex-spataru]

Hi! Happy to help. Could you share your project file so I can better understand your setup?

One thing worth knowing: this is actually a common point of confusion when working with AI assistants. Serial Studio's project files use JSON, and AI tools often assume that means data is also read from JSON keys...but that's not how it works. To do that, you'd need to configure a custom frame parser.

Serial Studio has several operation modes:

• Quick Plot: processes CSV-formatted data out of the box (similar to Arduino Plotter)
• Project Mode: lets you build custom dashboards by defining widgets and assigning each one an index that maps to your incoming data. You write a small JavaScript frame parser function to convert your device's raw output into an array or matrix that Serial Studio can read
• Device Defined Mode: device sends the project to Serial Studio. Not recommended due to latency issues, but still there because its useful.

These docs walk through exactly how data flows and how to configure everything correctly:

• Operation Modes: https://serial-studio.com/help#operation-modes
• Project Editor: https://serial-studio.com/help#project-editor
• Frame Parser Function: https://serial-studio.com/help#javascript-api

[alex-spataru]

Btw, if you don't want to change your MCU code, you can check the ISS Telemetry Example for an example to how to parse JSON data in Serial Studio.