Step 13: Going wireless with XBee

Example 9- Wireless XBee radios

This allows you to use the Nunchuck control but does it by setting up one controller as a transmitter and another controller as the receiver. I use the Adafruit XBee wireless adapter because it's super easy to use and can work on both 3V and 5V so it's great for most any Arduino wireless project. The servo board is set up for point to point communication and the XBee adapter plugs directly into a socket at the top of the board. This setup would really well for controlling haunted house attractions.

You can get the XBee adapter and radios here-

There is a complete XBee tutorial for building the XBee adapter and configuring it here-

Unlike the previous nuchuck control code, this code uses a new nunchuck library that cleans up the code considerably. It is called nunchuck_funcs.h
You can get it here-

Simply place the nunchuck_funcs.h library into your Arduino libraries folder and you're good to go.

The wiring for this is exactly like the wiring for example 6 except the nunchuck is connected to the transmitter and the servos and LEDs are connected to the receiver.

Note- you cannot connect the USB to serial adapter while the XBee adapter is plugged into its socket as they use the same data transmission lines. You must program the controller first and then plug in the XBee adapter. If you need to be able to monitor the serial port while using the XBee you can use a couple of wires to connect the XBee RX and TX to digital out pins 2 and 3 as shown in the Adafruit point-to-point tutorial.

Here's the code for the transmitter-

 * Example 9a
 * Nunchuck XBee transmitter
 * This code uses the nunchuck functions library and an XBee radio (w/ Adafruit XBee adapter)
 * to make a Wii nunchuck a wireless input device
 * Honus 2010
 * Nunchuck functions library from Tod E. Kurt, http://todbot.com/blog

#include "Wire.h" // include the Wire library
#include "nunchuck_funcs.h" // include the nunchuck functions library

int loop_cnt=0;

byte accx,accy,zbut,cbut,joyy,joyx;
int ledPin = 13;

void setup()
    nunchuck_init(); // send the initilization handshake
    pinMode(ledPin, OUTPUT);

void loop()
  digitalWrite(ledPin, HIGH);   // set the LED on  

    if( loop_cnt > 100 ) { // every 100 msecs get new data
        loop_cnt = 0;


        accx  = nunchuck_accelx(); // ranges from approx 70 - 182
        accy  = nunchuck_accely(); // ranges from approx 65 - 173
        zbut = nunchuck_zbutton();
        cbut = nunchuck_cbutton();
        joyx = nunchuck_joyx();
        joyy = nunchuck_joyy();


Here's the code for the receiver-

 * Example 9b
 * Nunchuck XBee receiver
 * This code receives input from a Wii nunchuck using an XBee radio (w/ Adafruit XBee adapter)
 * and controls four servos and two digital pins to turn on LEDs
 * Honus 2010

#include "Servo.h" // include the Servo library

int joyx,joyy = 135;
int accx,accy = 135;
int zbut,cbut = 0;
int ledPin1 = 13;
int ledPin2 = 12;
int lightvalue1 = 255;
int lightvalue2 = 255;
char nunchuckData;
int val = 0;
int tempval = 0;
int servo1Pos;
int servo2Pos;
int servo3Pos;
int servo4Pos;
int buttonState1 = 0;
int buttonState2 = 0;
int lightMode1 = 0;
int lightMode2 = 0;

Servo servo1;
Servo servo2;
Servo servo3;
Servo servo4;

int servoPin1 = 9;
int servoPin2 = 8;
int servoPin3 = 7;
int servoPin4 = 6;

void setup()
//  Serial.begin(9600);
//  Serial.print("Nunchuck ready\n");

    pinMode(ledPin1, OUTPUT);
    pinMode(ledPin2, OUTPUT);

void loop() {
  if (accy > 125) {
    servo1Pos = 90-(accy-125);
    if (servo2Pos < 45)
      servo1Pos = 45;
  if (accy < 125) {
    servo1Pos = 90+(125-accy);
    if (servo1Pos > 135)
      servo1Pos = 135;
  if (accx > 125) {
    servo2Pos = 90-(accx-125);
    if (servo2Pos < 45)
      servo2Pos = 45;
  if (accx < 125) {
    servo2Pos = 90+(125-accx);
    if (servo2Pos > 135)
      servo2Pos = 135;
   if (joyy > 125) {
    servo3Pos = 90-(joyy-125);
    if (servo3Pos < 45)
      servo3Pos = 45;
   if (joyy < 125) {
    servo3Pos = 90+(125-joyy);
    if (servo3Pos > 135)
      servo3Pos = 135;
  if (joyx > 125) {
    servo4Pos = 90-(joyx-125);
    if (servo4Pos < 45)
      servo4Pos = 45;
  if (joyx < 125) {
    servo4Pos = 90+(125-joyx);
    if (servo4Pos > 135)
      servo4Pos = 135;
  if (cbut != buttonState1) {         // the button state has changed!
    if (cbut == 1) {                  // check if the button is pressed
      if (lightMode1 == 0) {          // light is off
        lightMode1 = 1;               // light is on!
        digitalWrite(ledPin1, HIGH);
      } else {
        lightMode1 = 0;               // light is on!
        digitalWrite(ledPin1, LOW);
  if (zbut != buttonState2) {         // the button state has changed!
    if (zbut == 1) {                  // check if the button is pressed
      if (lightMode2 == 0) {          // light is off
        lightMode2 = 1;               // light is on!
        digitalWrite(ledPin2, HIGH);
      } else {
        lightMode2 = 0;               // light is on!
        digitalWrite(ledPin2, LOW);
  buttonState1 = cbut;               // save the new state in our variable
  buttonState2 = zbut;               // save the new state in our variable
  while(Serial.available()) {
    tempval = Serial.read();
    if (tempval=='x')    {
    else if (tempval=='y')    {
    else if (tempval=='X')    {
    else if (tempval=='Y')    {
    else if (tempval=='Z')    {
    else if (tempval=='C')    {
    else if (tempval >='0' && tempval <= '9')  {
      val=val * 10;
      val=val + (tempval - '0');

      if (nunchuckData=='x'){
      else if (nunchuckData=='y'){
      else if (nunchuckData=='X'){
      else if (nunchuckData=='Y'){
      else if (nunchuckData=='Z'){
      else if (nunchuckData=='C'){
  }  //end of input in serial buffer

WOW It's fun~!Like it
<p>Okay I have no idea how to even get half of the things you used there, but I LOVE LOVE LOVE the Predator costume and I'm going to a costume party in May and Im wondering what it would cost me to have you do those things for me? It would be awesome! Seriously! I'd be the coolest girl there for sure! And/or maybe you can just make some nice sound and lightning effects for me if that would be easier? Please let me know and send me an email to Maria.marlean@gmail.com</p>
Sorry but I can't take on any more work right now!
I am interested in buying a Predator cannon with head tracking movement so I can put it in my bio helmet my email address is joe.r.moreno.1969@gmail.com if anyone has one for sale I will really appreciate it thank you
<p>hello honus , is it possible to have the plan and component name for the hand repulsor , please , thanks my mail , leeloan@hotmail.com</p>
I'm not sure I understand. Everything you need is shown in the instructable.
<p>hello honus , is it possible to have full plan and component for build the hand repulsor ? as i'm not expert electronic but will try to buy and build it myself , my mail leeloan@hotmail.com</p>
Hi man. That canon is awesome. Would you be able to make the basic assembly as shown in the 15 steps. I will build into medi pack and add the canon onto the white bracketing<br>I have a suit and would love this accessory
Thanks- glad you like it! I'm sorry but I can't take on any more work right now.
My suit
My suit
And we'll paid for your time. No rush at all for finished article
Awesome stuff. Can't believe I haven't discovered your stuff sooner. Do you have a email contact?<br>What is the best way to get your some of your pcb boards made? servo, transistor, led boards.
Oh and just with the servo and the blinking LEDs, nothing else
You mean like in Step 7? You can add another servo to any digital output pin and then just copy the code for the existing servo and change the output pin number.
Ah ok cheers
I like this a lot thanks for posting! Can someone tell me how I could add another servo to it, on the same breadboard?
<p>HI, you mentioned possibly building and assembling an Arduino animatronics board at a price. I'm not sure if this is something i could successfully build on my own, but I would be interested in building an adruino board with an Xbee chip that would power my repulsors and Unibeam with sound, helmet opening/closing with eyes lit up flickering when closed, and mini gun movement (spinning and movement tracking for my War Machine costume, I would be really interested in getting some pricing on what it would cost to build. If that is something you may have time or be interested in building, please let me know. Sincerely, ~greg my email is thegovernor08@yahoo.com</p><p>And thanks again for all of the helpful information.</p>
Honus, <br><br> Absolutely amazing work and I want to thank you very much for all the effort that has gone into this as well as taking and answering questions and comments! <br> I am just getting started with arduino and hope you can help me if at all possible. I'm planning a project for Halloween that includes a &quot;Nullifier Ray&quot; attached to the ceiling. I would like to have the body of the ray drop (tilt) down from level with the ceiling, and swing (pan) to the right to point at an object on a table. Then, I'd like the barrel to begin to spin and ultimately activate several super bright LEDs to simulate a &quot;blast&quot; from the ray. Sound would be great but isn't necessary. <br> Does this sound possible for a beginner such as myself and if so, would it be possible for you to help me work parts of your code to make it happen? <br> Thank you for any advice or help you can provide. I'm overwhelmed by all the information in this instructable!
Thanks! Of course your project is possible to do and I'm happy to help. Just work up a drawing or schematic with the specifics of what you want it to do and message me. The important things you need to figure out is the range of movement you need, how heavy it will be and how you want to power and activate it.
<p>Thank you for all the time you out into this, especially the purchase links. I'll be sure to share projects that result from the info.</p>
<p>Honus,</p><p>I'm wondering if I need a voltage regulator with the Pro Mini. Reading on the Arduino website, it says:</p><p>&quot;The Arduino Pro Mini can be powered with an FTDI cable or breakout board <br> connected to its six pin header, or with a regulated 3.3V or 5V supply <br>(depending on the model) on the Vcc pin. There is a voltage regulator on <br> board so it can accept voltage up to 12VDC. If you're supplying <br>unregulated power to the board, be sure to connect to the &quot;RAW&quot; pin on <br>not VCC.&quot;</p><p>I'm trying to figure out how to connect a G4 LED light which is rated to 9-15V DC to the Pro Mini to use in my IM gloves with a flex sensor to turn them on and off. I'm testing with my mega 2560 and have the flex sensor figured out but am trying to figure out how I am supposed to connect the light and the flex sensor and the battery to the pro mini. It sounds like I should be able to use an E23A battery which is 12 volts, but I don't want to fry the board, and have no idea how to wire all of these together as I'm just getting started with the electronics stuff. Any hints?</p>
There's a few different ways you can do this. You could use a 7805 voltage regulator to drop the voltage from your battery to 5V to power the ProMini and connect it to the VCC pin ( assuming you have the 5V version ProMini ) if you're worried about frying it. Some batteries are rated at maybe 12V but at full charge they can overshoot this by a fair amount. <br><br>Then you can also connect your 12V battery to your LED light using a transistor to turn it on and off- the ProMini will not be able to provide enough current to drive it so it cannot be directly connected to an output pin. You can use something like a TIP120 transistor to turn the LED on and off. <br><br>Just let me know if you need a wiring diagram! It's pretty simple to do. :)
<p>Hmm. Well, I bought 4 of the 3.3 volt Pro Minis to use in various parts of the suit, but may be able to return them to SparkFun as they haven't been opened. I got them because I figured fewer batteries to power the boards would save space. Would you recommend doing that or is there a workaround? And a diagram would be awesome! Can't tell you how many times I've poured over your tutorial and am just amazed at what you've done. </p>
<p>You can still use the 3.3V ProMinis- just connect the power out from the regulator to the RAW input. I do this all the time since I run servos with a ProMini from single power source. I'll get you a wiring diagram asap.</p>
<p>Cool. Thanks Honus.</p>
<p>Here you go. Just let me know if this doesn't make sense!</p>
<p> Thanks Honus. You are awesome! It totally makes sense.</p>
<p>Thanks to you I got the sensor, G4 light, and pro mini all working off that little 12V A23 battery. Thank you! Thank you! I had issues with the board not wanting to talk to my laptop to upload my sketch, and realized it was the cable of all things. The first 2 I tried wouldn't allow an upload, the third and 4th ones did. Did my first through-hole soldering to get wires hooked up.</p>
<p>Awesome! So happy you got it to work! :)</p>
<p>Wow awesome Instructable! very nice Project! </p><p>Do you have a Video of it working in final state? :-)</p><p>vlg Stefan</p>
<p>Thanks- glad you like it! </p><p>Video of what in it's final state?</p>
<p>I meant the Predator Gun and Helmet with painting and Costume ;)</p>
Have a look here-<br> <a href="https://www.instructables.com/id/Building-a-killer-Predator-costume/" rel="nofollow">https://www.instructables.com/id/Building-a-killer-Predator-costume/</a>
<p>Cool! Thank you!</p>
Wondering if there is another place to buy your PCB? <br>
You can upload the board files to several different PCB manufacturers and have them made. I haven't made any more of them as I'm going to make a simpler version of the board- I've found I rarely use the rechargeable LiPo and I'd like it to be a bit smaller to make it easier to fit in my projects.
Honus, <br>If you aren't using the LiPos any more, what are you using?
I've been using NiMh cells to power everything. Much more durable inside costumes. The biggest problem with using LiPo cells (especially when using multiple cells, like 2s packs) is regulating them in regards to low voltage cutoff since RC packs don't usually have any type of protection circuitry. There are also severe shipping restrictions on LiPo packs so if you have to ship a costume somewhere it's a real pain.<br><br>Unless you have a specific application where you need the energy density of LiPo cells due to weight and/or space restrictions they're just not worth the hassle in my opinion.
Great! <br>Favorited!
Thanks for this great instructable! <br> <br>I'm planning a very similar thing as the Predator shoulder cannon and have one question: <br> <br>I'm not much of a Wii gamer so I don't know exactly how a nunchuck behaves. But wouldn't the motion sensor still also be triggered when you move and walk around and not only when you turn your head? How did you make the cannon only follow your heads movement no matter where your whole body moves and turns to?
Thanks- glad you like it!<br><br>The sensor from the nunchuck is an accelerometer and it's mounted in the helmet so it only senses when the helmet moves (with respect to gravity.) It only senses when the helmet tilts ( X and Y axis ) so you can walk around all you want without it being affecting. Also have a look at the FAQ section- I explain a bit more there.
I looked at the FAQ first, but didn't understand it all. My first idea before reading your instructable was actually using two gyros (one on the head and one in the cannons base) like you described but that seemed very complicated to me. I think I'll try it with your method and experiment a bit :). <br> <br>I don't want to use a Nunchuk since there are some affordable accelerometer modules out there like this one: <br>http://www.ebay.de/itm/ADXL345-3-axis-Digital-Tilt-Sensors-Acceleration-Module-For-Arduino-/181185887400?pt=Bauteile&amp;hash=item2a2f853ca8 <br> <br>Or would it be advisable to get one with a gyro like this? <br>http://www.ebay.de/itm/MPU-6050-3-Axis-Gyro-Gyroscope-Accelerometer-Sensor-Module-for-Arduino-/181018466904?pt=Bauteile&amp;hash=item2a258a9a58
Pretty much any of the Analog Devices ADXL accelerometers would work. I really don't see the need for a gyro in this application but if you want to incorporate one to try and improve the rotation performance then I say go for it! :)
What would it take to adapt this setup to be used in your Horus helmet rig? I just ordered an arduino board to get started and would love to be able to track my own head movements to the bird's head.
I've had a few people ask about this. The problem is that you can't really move your head that much while wearing the Horus helmet. The great bit with the Horus helmet is that your head stays still and ONLY the bird head moves. The lower part of the Horus helmet really does not move- the movie helmets only had a few degrees of rotation between the lower part of the helmet and the neck collar.
hi um i was wondering about animatronics and what i would need to go to college for in order to buld,design,and program animatronics and i noticed what you made was cool. so do you have any tips on what schools to go to or what programs to take?
I would look at mechanical engineering, robotics, 3D design/CAD, electronics and classes that involve physical computing. Animatronics covers a wide variety of disciplines- molding, casting, fabrication, mechanics, hydraulics, pneumatics, electronics, programming, etc. There's a lot of problem solving that involves thinking about how you want things to move and then making mechanisms that fit within a limited volume.<br> <br> There are classes and workshops for Arduino to get your feet wet in the electronics area and Stan Winston School has videos you can watch that cover all aspects of creature fabrication. They specifically have a couple of videos by Rick Lazzarini of The Character Shop that covers radio control animatronics. Check it out here-&nbsp;<a href="http://www.stanwinstonschool.com" rel="nofollow">http://www.stanwinstonschool.com</a><br> <br> Rick Lazzarini also teaches people here- <a href="http://www.animatronicsinstitute.com/" rel="nofollow">http://www.animatronicsinstitute.com/</a><br> <br> If you have any other questions just let me know!
Thanks so much...all of this makes alot of sense...I know what I want but no idea how to get there and have never done anything like this before. Sadly I have not even found anything prebuilt out there that does what I want either (my 2nd resort is always to cannablize anything premade). <br>I think it would be amazing if the eyes lit up when the sound effect when off...you are going to have to email me or else this post will get very long, but a list of parts would be a fantastic start. As far as sounds I would love a Wolf howl and growl/snarl too but I may be well overstepping my novice skills
It's definitely possible to do everything you want. :) just message me your email and I'll help you put it together.

About This Instructable




Bio: I'm a former bicycle industry designer turned professional jeweler. I like working with my hands and am happiest when I'm in the shop ... More »
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