Arduino Powered Lucky Cat As Physical Webcounter




Introduction: Arduino Powered Lucky Cat As Physical Webcounter

Everybody wants to know how many pageviews your own website has. But see what's happening you need some analytics code and stuff like this. I wanted to be connected to the wold when I'm sitting on my couch so I connected my Lucky Cat to the internet.
Whenever someone visits a page on my website the cat waves it's arm for a while. At night though I need some silence. So I built in a RGB LED which changes its color whenever a new pageview happens.

All you need is:
a Lucky Cat
an arduino ethernet
two small yellow LEDs
a light sensor
a servo
and a two digit seven segment display (I harvested mine from an old stereo and built a little circuit using some resistors and two shift registers)

Step 1: The Servo

The mechanical part is easy: opening up the cat you can see the counterweight of the arm. When the servo turns, the spring hits the counter weight of the arm and the arm swings for something like 20 seconds. I use some hotglue and part of a small plastic thingy to place the servo beneath the cats mechanics.
(I coded something like a time delay into the software part, so that the servo does only swing the arm once every 20 seconds. So if there would be multiple pageviews in that time, the counter would count them, but the arm just moves every 20 seconds until the work is done)

Step 2: Buttons and LEDs

I used two buttons:
button one is connected to Ground (GND) and the reset pin of the arduino.
The second one is to manually start the RGB LED, because it's always fun to change the color of an LED. It's connected to Pin 7 and +5V. And to pull the pin low there's a resistor (10K) connected to GND.
The RGB LED is connected to Pin 17 to 19 on the arduino. (Would be better to connect them to the PWM pins)
The yellow LEDs are attached to Pin 16
The servo is attached to Pin 6 (and +5V and GND)
The display uses Pin 2 as LatchPin, Pin 3 as DataPin and Pin 4 as ClockPin. It's juice it gets from +5V and GND
The light resistor is attached to analogue pin 1 and +5V and to GND using some resitors (2.4K)

Choose the correct resistors for your leds for example by using ElectroDroid on your smartphone.

Step 3: The Cats Firmware

I used an image as counter on my website which is loaded from the arduino which works as a webserver. Its connected to the internet using dyndns. Whenever the gif on the webpage will be loaded by the client, the arduino notices this and starts counting and processing and working and blinking and stuff like that.
These counts are shown on the display. For the movements of the arm there's another counter so that multiple arm movements can be processed independent of the actual website-hits. That's because the arm swings a while after being hit by the servo. 
The arduino checks the light so that at night, the servo won't work but the RGB LED will change it's color everytime a hit on the website happens (this part happens without a delay)

Here's the code:

  Web  Server

Webserver listens to the web and moves a servo
LightSensor checks the light so that the servo isn't move when it's dark
A seven segment display works with the help of shiftregisters to show a counter


#include <SPI.h>
#include <Ethernet.h>
#include <Servo.h>

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 178, 188};

//for Digits:
int latchPin = 2;//muss noch angeschlossen werden
int clockPin = 4;
int dataPin = 3;
int yellowPin = 16;
int redPin = 18;
int bluePin = 17;
int greenPin = 19;
int btnPin = 7;

int red;
int green;
int blue;
int yellow;
int ydir; //direction of Yellow fade

//digit is the array for numbers 192 for 0, 249 for 1,... 255 for nothing and 191 for -
byte digit[] ={192, 249, 164, 176, 153, 146, 130, 248, 128, 144, 255, 191, 225, 163, 171, 198, 167, 123};

int dig1;
int dig2;
int number;
int light;

//light sensor:
int lightPin = 1;//light sensor

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
Servo myservo; //create servo object to control servo
int count = 0;

unsigned long previousMillis = 0;
unsigned long currentMil = 0;
unsigned long previousMil = 0;
unsigned long mil = 0;

boolean timepassed = true;

void setup()
  myservo.attach(6); // attaches the servo on pin 6
  // start the Ethernet connection and the server:
  Ethernet.begin(mac, ip);

  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(btnPin, INPUT);//switch
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, digit[11]);//ones
  shiftOut(dataPin, clockPin, MSBFIRST, digit[11]);//tens
  digitalWrite(latchPin, HIGH);
  number = 0;
  red = 0;
  green = 0;
  blue = 0;
  yellow = 250;
  ydir = 1;
  analogWrite(yellowPin, yellow);
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);

  Serial.print("server is at ");


void loop()
  //randomSeed(analogRead(A0)); //Yellow random
  //yellow = random(111, 256);
  yellow = yellow + (1 * ydir); //kind of fade
  if (yellow == 255) ydir= -1;
  if (yellow == 110) ydir = 1;
  analogWrite(yellowPin, yellow);//Eyes on

  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c =;
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");

          count = count +1;//there was a request

          number = number+1;//Counter
          if (number == 99) { //so the 100 is missing :( but who cares
            //digitalWrite(yellowPin, HIGH); //not needed anymore because yellowPin is analogWrite all the time
            number = 0;

        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
    // give the web browser time to receive the data
    // close the connection:

    red = random(256);
    green = random(256);
    blue = random(256);

     Serial.print("Servo: ");
     Serial.print("Timepassed: ");
     Serial.print("Count: ");
     Serial.print("Number: ");
     Serial.print("Mil: ");
     Serial.print("Licht: ");
     Serial.print("red: ");
     Serial.print("green: ");
     Serial.print("blue: ");


          lightsens(); //checks the light
          time();// checks the time

         if (light <99 && timepassed == true && count >0 ){//so when its dark the servo doesn't work and
            myservo.attach(6);//attaches Servo to Pin6 again
            if ( 0 ) {
                myservo.write(180); //arm up
                timepassed = false;
                count = count -1;
            else if ( == 180) {
                myservo.write(0);//arm down
                timepassed = false;
                count = count -1;
            myservo.detach();//detaches Servo
            //turn lights of if servo is running
            analogWrite(redPin, 0);
            analogWrite(greenPin, 0);
            analogWrite(bluePin, 0);
       else if (light >=99 && count >0){//so when its dark the light changes with every hit on the website
           analogWrite(redPin, red);
           analogWrite(greenPin, green);
           analogWrite(bluePin, blue);
           count = count-1;
           timepassed = false;          

       if (digitalRead(btnPin) == HIGH){ //check if button is pressed
            red = random(256);
            green = random(256);
            blue = random(256);

            analogWrite(redPin, red);
            analogWrite(greenPin, green);
            analogWrite(bluePin, blue);


//----Part two: Seven Segments Display

void SevenSegDis() {//controls display with two shift registers
  number = constrain(number, 0, 99);//number >=0 and <99 because of display range
  if (number<10){
    dig1 = 10; //shows nothing
    dig2 = number; //ones
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, digit[dig2]);//ones
    shiftOut(dataPin, clockPin, MSBFIRST, digit[dig1]);//tens here nothing
    digitalWrite(latchPin, HIGH);
  else {
    dig1 = number/10;// first digit tens
    dig2 = number - dig1*10; //second digit ones
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, digit[dig2]);
    shiftOut(dataPin, clockPin, MSBFIRST, digit[dig1]);
    digitalWrite(latchPin, HIGH);

//---------Part Three: the light sensor part

void lightsens() {
  light = analogRead(lightPin);
  light /= 10;


//---------- Part Four: the time thingy

void time (){
currentMil = millis();
  if (currentMil < previousMil) {// if millis overflows
    mil += 34359738 - previousMil + currentMil;
  else { // if millis has not overflown
    mil += currentMil - previousMil;
    if (mil >25000){//if 20 sec. passed
    timepassed = true;//resets the timepassed to true for the servo
    mil = mil-25000;
    previousMil = currentMil;  

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    9 years ago on Introduction

    The "Lucky Cat" is a cool display! Nice project.


    9 years ago on Introduction

    Hi Janwil ,

    i love the idea of storing a .gif and counting the requests for it .Its a nice workaround for people who don't have a host that supports scripts such as google blogger.Could i request the sketch pls ? as i have a bell here waiting to ring when i get a hit on ,but till now it hasn't been possible .

    Best Regards



    Reply 9 years ago on Introduction

    Hi Rupert,

    the only thing you have to include into your blog or website is a gif, pointing to the arduino. I used dyndns to get something like a "fixed" ip, so the url for the gif is like where is the arduinos ip here in my homenetwork. Include the gifs url into your website and it will be directed to the arduino. On the arduino site you'll need to include the part of the sketch here in the instructable starting with // listen for incoming clients... 

    Nice blog you have there

    very cute, love the idea! can you explain a little more about how you set this up? there is in image on your page that you have stored in the Arduino? where are you hosting the other files on your site? can you post a link to the site?


    Reply 9 years ago on Introduction

    The setup on the website is easy: there's just a .gif pointing to the url of the arduino:

    The ip of the arduino here in my homenetwork is determined within it's sketch. So whenenver a browser asks for that .gif it's directed right to the arduino. The arduino does recognize that and send's back an 200ok line to the browser so that the browser finishes loading the website. So there's never a real image send, it's just used to point the browser to the arduino.


    9 years ago on Introduction

    ALso what are the colors you explain in the beginning such as red pin etc, are these part of your shift register pins? Im curious as to your basic display counter with the 2 7 segment displays do you have more info on that circuit?
    Anyway cool idea!


    Reply 9 years ago on Introduction

    The colors are the variables for the RGB LED which lights up at night instead of waving the cats arm.
    The seven segment displays setup could be part of another instructable I think. basically its 14 LEDs which are controlled by the arduino. Normally one would have to use 14 pins on the arduino, but with using shift registers, you just have to use three arduino pins to control the LEDs. I'll search for my notes on that and jot it down in another instructable