This Arduino sketch enables serial communication to read user input from the Serial Monitor, including an integer, a floating-point number, and a string, and then echoes the input back.

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An Arduino Uno provides the processing power and drives the serial monitor. A joystick and a Hitachi H48C accelerometer are mounted on a breadboard and wired to the Uno.

While the Arduino family of boards connect to your computer using a USB virtual serial port, the ATmega ones have an actual serial connection on-board.