Arduino Internals -

: Your .ino file is converted into a valid .cpp file by adding #include and generating function prototypes.

: The avrdude tool sends this binary file to the microcontroller’s flash memory via the Bootloader . 3. Hardware Internals & Registers Arduino Internals

int main(void) { init(); // Hardware initialization (timers, PWM) setup(); // User-defined setup for (;;) { loop(); // User-defined loop running forever } } Use code with caution. : Your

: Every C++ program needs a main() function. In Arduino, this is hidden in the core files (e.g., main.cpp ). It typically looks like this: Hardware Internals & Registers int main(void) { init();

: These files are linked with the Arduino Core (pre-compiled code for the specific board) to create a single .hex or .bin file.

Contrary to popular belief, Arduino does not have its own language. It uses with a specific set of libraries and a pre-processing step.

When you click "Upload," the Arduino IDE performs several background tasks: