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Arduino · Module 6 of 10

Serial communication and debugging

Talk to your computer and debug sketches.

📖 Key ideas

  1. Serial.begin(9600) starts serial communication.
  2. Serial.print/println sends data to the Serial Monitor.
  3. Serial Plotter graphs values.
  4. Serial.read() receives commands from the PC.
  5. Debug by printing variable values.
💡 Real-life example: The Serial Monitor is a walkie-talkie between your Arduino and your laptop.
Serial.beginStarts serial at a baud rate
Serial MonitorShows serial output
Serial PlotterGraphs serial values
Baud rateCommunication speed