Контроллер Arduino Uno, пара сервомашинок (для наклонно-поворотного механизма) и лазерная указка — вот и всё, что потребуется, чтобы самостоятельно сделать интерактивную игру для своего кота или кошки.

Код для Arduino — LaserCat.ino

// Include Libraries
#include "Arduino.h"
#include "BTHC05.h"
#include "VarSpeedServo.h"

// Pin Definitions
#define BTHC05_PIN_RXD	10
#define BTHC05_PIN_TXD	11
#define LASER_PIN_S	2
#define SERVO9G1_PIN_SIG	3
#define SERVO9G2_PIN_SIG	4

// Global variables and defines
// object initialization
VarSpeedServo servo9g1;
VarSpeedServo servo9g2;
BTHC05 bthc05(BTHC05_PIN_RXD, BTHC05_PIN_TXD);

bool laserState = 0;
bool autoplayState = 0;

const int servoSpeed = 10;
const int seqIntervalDelta = 50;
const int manualyServoMinStep = 5;
const int manualyServoMaxStep = 20;
const int minimalRangeSize = 10;

// Change these parameters to define the rectangular play area
int servo1Min = 80;
int servo1Max = 110;
int servo2Min = 20;
int servo2Max = 50;

int servo1pos = (servo1Min + servo1Max) / 2;
int servo2pos = (servo2Min + servo2Max) / 2;
int delayVal = 300;


// Setup the essentials for your circuit to work. It runs first every time your circuit is powered with electricity.
void setup()
{
  // Setup Serial which is useful for debugging
  // Use the Serial Monitor to view printed messages
  Serial.begin(9600);
  while (!Serial) ; // wait for serial port to connect. Needed for native USB
  Serial.println("start");

  bthc05.begin(9600);
  //This example uses HC-05 Bluetooth to communicate with an Android device.
  //Download bluetooth terminal from google play store, https://play.google.com/store/apps/details?id=Qwerty.BluetoothTerminal&hl=en
  //Pair and connect to 'HC-05', the default password for connection is '1234'.
  //You should see this message from your arduino on your android device
  bthc05.println("Bluetooth On....");

  servo9g1.attach(SERVO9G1_PIN_SIG);         // 1. attach the servo to correct pin to control it.
  servo9g2.attach(SERVO9G2_PIN_SIG);         // 1. attach the servo to correct pin to control it.
  pinMode(LASER_PIN_S, OUTPUT);
  // start with laser off
  digitalWrite(LASER_PIN_S, laserState);
  servo9g2.write(servo2pos , servoSpeed);
  servo9g1.write(servo1pos , servoSpeed);
}

// Main logic of your circuit. It defines the interaction between the components you selected. After setup, it runs over and over again, in an eternal loop.
void loop()
{
  String bthc05Str = "";
  //Receive String from bluetooth device
  if (bthc05.available())
  {
    //Read a complete line from bluetooth terminal
    bthc05Str = bthc05.readStringUntil('\n');
    // Print raw data to serial monitor
    // Serial.print("BT Raw Data: ");
    // Serial.println(bthc05Str);
  }

  // Settings
  // Turn laser On/Off
  if (bthc05Str == "Laser On/Off") {
    laserState = !laserState;
    digitalWrite(LASER_PIN_S, laserState);
    Serial.print("Laser: ");
    Serial.println(laserState);
  }
  // decrease the delay between random points in Autoplay mode
  else if (bthc05Str == "Speed Up") {
    delayVal -= seqIntervalDelta;
    Serial.print("delay: ");
    Serial.println(delayVal);
  }
  // increase the delay between random points in Autoplay mode
  else if (bthc05Str == "Speed Down") {
    delayVal += seqIntervalDelta;
    Serial.print("delay: ");
    Serial.println(delayVal);
  }
  // Enable Autoplay - random points
  else if (bthc05Str == "Autoplay") {
    autoplayState = !autoplayState;
    Serial.print("AutoPlay: ");
    Serial.println(autoplayState);
  }
  // Widen the servo margins
  else if (bthc05Str == "Area +") {
    servo1Min -= 5;
    servo1Max += 5;
    servo2Min -= 5;
    servo2Max += 5;

    servo1Min  = constrain(servo1Min, 0, servo1Max);
    servo1Max  = constrain(servo1Max, servo1Min, 180);
    servo2Min  = constrain(servo2Min, 0, servo2Max);
    servo2Max  = constrain(servo2Max, servo2Min, 180);
    Serial.print("Area +: ");
    char buf[20];
    sprintf(buf, "%d,%d,%d,%d", servo1Min, servo1Max, servo2Min, servo2Max);
    Serial.println(buf);
  }
  // tighten the servo margins
  else if (bthc05Str == "Area -") {
    if (servo1Max - servo1Min > minimalRangeSize) {
      servo1Min += 5;
      servo1Max -= 5;
    }
    if (servo2Max - servo2Min > minimalRangeSize) {
      servo2Min += 5;
      servo2Max -= 5;
    }
    Serial.print("Area -: ");
    char buf[20];
    sprintf(buf, "%d,%d,%d,%d", servo1Min, servo1Max, servo2Min, servo2Max);
    Serial.println(buf);
  }


  // Functionality
  if (autoplayState || bthc05Str == "Random Position") {
    servo9g2.write(random(servo2Min, servo2Max), servoSpeed);
    servo9g1.write(random(servo1Min, servo1Max), servoSpeed);
    // waits until servos reaches destination
    servo9g2.wait();
    servo9g1.wait();
    delay(random(delayVal, delayVal * 5));
  }
  else {
    // Move the laser manually in random size steps from 5 - 20 deg
    if (bthc05Str == "Up") {
      servo2pos += random(manualyServoMinStep, manualyServoMaxStep);
      servo2pos = constrain(servo2pos, servo2Min, servo2Max);
      servo9g2.write(servo2pos, servoSpeed);
      // waits until servo reaches destination
      servo9g2.wait();
      Serial.println(servo2pos);
    }
    else if (bthc05Str == "Down") {
      servo2pos -= random(manualyServoMinStep, manualyServoMaxStep);
      servo2pos = constrain(servo2pos, servo2Min, servo2Max);
      servo9g2.write(servo2pos, servoSpeed);
      // waits until servo reaches destination
      servo9g2.wait();
      Serial.println(servo2pos);
    }
    else if (bthc05Str == "Left") {
      servo1pos += random(manualyServoMinStep, manualyServoMaxStep);
      servo1pos = constrain(servo1pos, servo1Min, servo1Max);
      servo9g1.write(servo1pos, servoSpeed);
      // waits until servo reaches destination
      servo9g1.wait();
    }
    else if (bthc05Str == "Right") {
      servo1pos -= random(manualyServoMinStep, manualyServoMaxStep);
      servo1pos = constrain(servo1pos, servo1Min, servo1Max);
      servo9g1.write(servo1pos, servoSpeed);
      // waits until servo reaches destination
      servo9g1.wait();
    }
  }
}

Ссылки
How to Make an Interactive Cat Laser Pointer

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