Square Wave Generator Using Arduino

This project transforms an Arduino Uno into a configurable square wave generator capable of producing signals up to 10kHz. At the heart of the system is the Arduino Uno board, which executes the control firmware written via the Arduino IDE. Users interface with the generator using a 4x3 matrix keyboard connected to the digital pins of the microcontroller. By pressing keys on the matrix, the user can input specific parameters to adjust both the frequency and the duty cycle of the output signal in real-time. The circuit layout utilizes 1-kilo-ohm resistors (designated as R1 through R3) to provide necessary current-limiting and pull-up or pull-down configurations for reliable scanning of the keypad rows and columns. Power is supplied to the entire assembly via an external power supply source connected to the Arduino board. Once the user inputs the desired wave parameters through the keypad interface, the Arduino processes these values and toggles its digital output pins accordingly, generating the precise square wave signal for external use.