Embedded · Tool
Serial monitor and plotter
See what any Arduino sketch prints with Serial.println(), send it text, and plot the numbers it prints, live, without leaving the browser. It works with your own sketches, not just the Hardware lab’s.
Connection
Monitor
Plotter
Each line with numbers in it becomes a point. Print several values separated by spaces or commas, or name them like the Arduino IDE’s plotter: Serial.print("light:"); Serial.print(a0); Serial.print(","); Serial.print("temp:"); Serial.println(t);
If nothing appears
- Only one program can use the port: close the Arduino IDE’s Serial Monitor and Plotter first.
- Garbled characters usually mean the baud rate does not match Serial.begin() in the sketch. Disconnect, change it, and connect again.
- Connecting restarts an Uno or Nano, so the first lines can take a couple of seconds.
- This page needs Chrome or Edge on a computer (Web Serial). Nothing you see here is sent anywhere.
Back to the Hardware lab.