Tech Prank: Hardware Mouse Jiggler

Contributors: Shawn Hymel

Programming

Follow the instructions found in the Pro Micro Hookup Guide to ensure you can upload programs to the Pro Micro from Arduino. From there, copy the following code into Arduino and upload it to your Pro Micro:

language:c
/**
 * April Fools' Mouse Prank
 * Date: February 27, 2018
 * Author: Shawn Hymel (SparkFun Electronics)
 * 
 * Upload this to a SparkFun Pro Micro, and plug it into an 
 * unsuspecting computer. That's it!
 * 
 * This sketch was written by SparkFun Electronics, with lots of
 * help from the Arduino community. This code is completely free
 * for any use.
 */

#include "Mouse.h"

#define DEBUG 0

// Parameters
const int NUM_STATES = 3;             // Number of possible animations
const unsigned long WAIT_MIN = 10000; // ms (inclusive)
const unsigned long WAIT_MAX = 20000; // ms (exclusive)
const unsigned long JUMP_MIN = -1000; // Pixels (inclusive)
const unsigned long JUMP_MAX = 1000;  // Pixels (exclusive)
const int DIR_MIN = 0;                // Degrees (inclusive)
const int DIR_MAX = 360;              // Degrees (exclusive)
const int SPD_MIN = 1;                // Pixels (inclusive)
const int SPD_MAX = 5;                // Pixels (exclusive)
const int LINE_ACC = 10;              // Number of times to accumulate
const int LINE_NUM_MIN = 50;          // Min number of times to move in line
const int LINE_NUM_MAX = 300;         // Max number of times to move in line
const int JITTER_MIN = -4;            // Pixels (inclusive)
const int JITTER_MAX = 5;             // Pixels (exclusive)
const int JITTER_NUM_MIN = 50;        // Min number of times to jitter
const int JITTER_NUM_MAX = 300;       // Max number of times to jitter

// Patterns
typedef enum {
  STATE_JUMP,
  STATE_LINE,
  STATE_JITTER
} mouse_states;

void setup() {
  randomSeed(analogRead(0));

#if DEBUG
  Serial.begin(9600);
#endif
}

void loop() {

  // Wait a random amount of time
  delay(random(WAIT_MIN, WAIT_MAX));

  // Pick a random state
  switch ( random(NUM_STATES) ) {
    case STATE_JUMP:
      mouseJump();
      break;
    case STATE_LINE:
      mouseLine();
      break;
    case STATE_JITTER:
      mouseJitter();
      break;
    default:
      break;
  }
}

void mouseJump() {
  Mouse.move(random(JUMP_MIN, JUMP_MAX), random(JUMP_MIN, JUMP_MAX), 0);
}

void mouseLine() {

  // Pick a random direction and speed
  int dir_deg = random(DIR_MIN, DIR_MAX);
  float dir = dir_deg * (PI / 180);
  float spd = (float)random(SPD_MIN, SPD_MAX) / LINE_ACC;
  float x = spd * cos(dir);
  float y = spd * sin(dir);
  float x_acc;
  float y_acc;
  int line_num = random(LINE_NUM_MIN, LINE_NUM_MAX);

#if DEBUG
  Serial.print("Speed: ");
  Serial.print(spd);
  Serial.print(" | Dir: ");
  Serial.print(dir_deg);
  Serial.print(" deg ");
  Serial.print(dir);
  Serial.print(" rad | x:");
  Serial.print(x);
  Serial.print(" y:");
  Serial.println(y);
#endif

  // Move mouse in a line for a random number of times
  for ( int j = 0; j < line_num; j++ ) {

    // Accumulate the motion for a few times, round it, and apply
    x_acc = 0;
    y_acc = 0;
    for ( int i = 0; i < LINE_ACC; i++ ) {
      x_acc += x;
      y_acc += y;
    }
    Mouse.move((int)(x_acc + 0.5), (int)(y_acc + 0.5), 0);

    delay(10);
  }

#if DEBUG
  Serial.print("Moving x:");
  Serial.print((int)(x_acc + 0.5));
  Serial.print(" y:");
  Serial.println((int)(y_acc + 0.5));
#endif
}

void mouseJitter() {

  int jitter_times = random(JITTER_NUM_MIN, JITTER_NUM_MAX);

  // Cause the mouse to jitter some random amount
  for ( int i = 0; i < jitter_times; i++ ) {
    Mouse.move(random(JITTER_MIN, JITTER_MAX), random(JITTER_MIN, JITTER_MAX), 0);
    delay(10);
  }
}

You are welcome to play around with the numbers in the Parameters section if you want to make the delay longer between movements or make the jumps farther.