Serial Plotter

▶ Getting Started

Open this page in Chrome or Edge. The Web Serial API is not supported in Firefox or Safari.
Close any other program using the port (Arduino IDE Serial Monitor, CubeIDE terminal, PuTTY…). Only one program can open a port at a time.
Set the Baud rate to match your firmware (default 115200).
Click Connect and choose your board's port in the browser popup.
Every received line appears in the Console; lines containing numbers are also plotted.

No board yet? Click Demo Mode to see simulated signals.

📌 Data Format

Send one sample per line, ending with \n. Two formats are plotted:

Plain numbers separated by commas, spaces, tabs or semicolons. Channels are named ch1, ch2, … by position:
```
0.98,-0.02,0.11
```
Labelled values name:value (the Arduino Serial Plotter format), so each channel gets its own name:
```
ax:0.98,ay:-0.02,az:0.11
```

Lines that mix words and numbers (e.g. WHO_AM_I = 0x6C) are shown in the console only and are not plotted.

💻 Firmware Examples

Arduino / ESP32

Serial.begin(115200);
...
Serial.print("ax:"); Serial.print(ax); Serial.print(",");
Serial.print("ay:"); Serial.println(ay);

STM32 (HAL, printf retargeted to UART)

printf("ax:%.3f,ay:%.3f,az:%.3f\r\n", ax, ay, az);

On STM32, printing floats with printf needs the "Use float with printf" option (newlib-nano) enabled in the project settings.

🛠 Tips

Pause stops recording: lines that arrive while paused are discarded, like an oscilloscope's Stop. While paused, drag or scroll the plot (or use ← → and the timeline slider) to look back in time; dragging or scrolling while live pauses automatically. Resume / Back to live returns to the newest data. About the last 100,000 samples per channel are kept.
Click a channel name above the plot to hide or show it.
Leave Y empty for auto-scaling, or fix the range to compare runs.
CSV downloads every plotted sample (with a time column); Log downloads the console text.
Garbled characters usually mean a wrong baud rate.
Sending binary packets (e.g. for the IMU Viewer)? Use the IMU Viewer instead: this page expects text.