What I wanted to learn, and why it interested me: I thought it would be fun to learn how to write to mouse/keyboard, no particular reason.

Process and reflection: 

Initially my first goal was to make a button that would type on the keyboard with a simple press. The largest issue with this was not realizing the Arduino pro micro board I was using had not been fully soldered. This realization took most of my time to fix. Upon fixing the issue setting up a safety pullout pin was simple enough.
Upon moving to the next part I was able to quickly implement the keyboard button press and mouse commands within a short amount of time. To test the mouse inputs I considered Inkcsape to be the best test subject given it is a vector designing program that would certainly have a rectangle tool.

/*

    60-223 Intro to Physical Computing, fall 2025

    Domain-specific Skill Building exercise: Square Mouse Drawer

    Code intended for the Arduino Pro Micro Board, it will hold the mouse, moving it diagonally

for 100 x 100 pixels downward to the bottom right of a screen from where the mouse is. 

    Pin mapping:

    Arduino pin | role  | details

    ------------------------------

    10            input   Safety plug

    9             input   Button to draw

*/

include "Mouse.h"

const static uint16_t SAFETY_PIN = 10;

const static uint16_t BUTTON_PIN = 9;

void setup() {

  pinMode (SAFETY_PIN, INPUT_PULLUP);

  pinMode (BUTTON_PIN, INPUT);

  Serial.begin (9600);

  Mouse.begin();

}

void loop() {

  while (digitalRead(SAFETY_PIN) == HIGH){

    Serial.print ("Safety pin is unplugged, safety pin at: ");

    Serial.println (SAFETY_PIN);

    delay (1000);

  }

  if (digitalRead (BUTTON_PIN)){

    Mouse.press();

    Mouse.move(100, 100, 0);

    Mouse.release();

    delay (150);

  }

}