# AtariFruit 2600 Joystick ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/048/763/medium800/gaming_PC030143_2k.jpg?1512351977) https://www.youtube.com/watch?v=h8Sy8gepqk4 Playing emulated games on an iPad or iPhone is a lot of fun, but one thing missing from the equation is a proper joystick. To fix this dire situation, you can take an original Atari 2600 joystick and turn it into a wireless controller capable of working with any iCade standard game!  The Feather nRF52 Bluefruit Bluetooth LE microcontroller is perfect for the task. It's fast, has robust Bluetooth, and is tiny enough to fit inside the joystick's case, along with a LiPo battery for power.  You won't even need to modify the case, just remove the original cable and you're ready to create a whole new, modern controller inside of the body of a classic! You can watch the full build from John Park's Workshop LIVE here: https://www.youtube.com/watch?v=qLIosOKl26Q ## Parts & Matrials The star of the show is an Atari CX-40 joystick from the venerable Atari 2600 Video Computer System. Check your basement or attic for one, but if you don't luck out, these are available inexpensively -- usually $10 to $15 -- on eBay or at your local thrift shop. Be sure to get an authentic, vintage, OEM (original equipment manufacturer) Atari joystick made between 1978 to 1986. There are modern joysticks and all-in-one game systems built to look like a CX40, but their internals will vary greatly from the original. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/846/medium800/gaming_PC030004_2k.jpg?1512408532) ### Part: Adafruit Feather nRF52 Bluefruit LE quantity: 1 nRF52832 [Adafruit Feather nRF52 Bluefruit LE](https://www.adafruit.com/product/3406) ### Part: Lithium Ion Polymer Battery quantity: 1 3.7v 500mAh [Lithium Ion Polymer Battery](https://www.adafruit.com/product/1578) ### Part: USB Micro-B Breakout Board quantity: 1 extend the USB port [USB Micro-B Breakout Board](https://www.adafruit.com/product/1833) ### Part: Slide Switch quantity: 1 Breadboard-friendly SPDT [Slide Switch](https://www.adafruit.com/product/805) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 26 AWG black [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/1881) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 White [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/1882) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 Yellow [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/1879) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 Blue [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/1878) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 Red [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/1877) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 Green [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/1880) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 Orange [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/1883) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 30 AWG black [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/2003) ### Part: Silicone Cover Stranded-Core Wire quantity: 1 30 AWG red [Silicone Cover Stranded-Core Wire](https://www.adafruit.com/product/2001) ### Part: 5V 1A (1000mA) USB port power supply quantity: 1 Charger [5V 1A (1000mA) USB port power supply](https://www.adafruit.com/product/501) ### Part: USB cable - A/MicroB quantity: 1 3' cable [USB cable - A/MicroB](https://www.adafruit.com/product/592) ### Part: Heat Shrink Tubing quantity: 1 Size and color variety pack [Heat Shrink Tubing](https://www.adafruit.com/product/1649) You'll also need a Philips screwdriver, soldering iron and solder, wire cutters/strippers, and a small bit of double stick foam tape to secure things. # AtariFruit 2600 Joystick ## Programming the Feather nRF52 ## iCade Standard Since the iPad doesn't have a game controller port on it like a video game console, game developers have come up with a few clever ways to interface physical controls with the device. One such standard is the [iCade](https://en.wikipedia.org/wiki/ICade) protocol, made by ION Audio for their line of iPad desktop arcade cabinets and controllers.  ![](https://cdn-learn.adafruit.com/assets/assets/000/048/834/medium800/gaming_ION_iCade.jpg?1512404972) The iCade standard interfaces with iOS as an HID keyboard, paired over Bluetooth Low Energy. The nRF52 Feather is going to act as a BLE keyboard so that it can "type" the keystrokes that the iCade standard uses. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/835/medium800/gaming_icade02.png?1512405051) Info: Here's what the button mapping looks like for the standard iCade: ![](https://cdn-learn.adafruit.com/assets/assets/000/048/836/medium800/gaming_icade03.png?1512405079) Info: ## Feather nRF52 Preparation If you're new to the Feather nRF52 Bluefruit board, check out [this Learning Guide to get started](../../../../bluefruit-nrf52-feather-learning-guide) with it. We'll be programming it as an Arduino board, so make sure you have [gone through this setup process](../../../../bluefruit-nrf52-feather-learning-guide/arduino-board-setup) and can successfully upload code to it before proceeding. For extra credit, you may want to also [run some of the example sketches](../../../../bluefruit-nrf52-feather-learning-guide/examples) to make sure you can pair it with your iOS device. ## AtariFruit Code In researching the iCade standard for my [iPad Pinball Controller project](../../../../pinball-controll-ipad/overview), I came across an [excellent project by Allen C. Huffman](http://subethasoftware.com/2013/01/04/teensy-2-0-icade-source-code/) that uses a Teensy as an iCade gamepad controller. We can use a modified version of that code for this project, too! I made some small adjustments to the code, and included keyboard mapping comments in line, as well as all of the code necessary to convert this to Bluetooth on the nRF52 Feather instead of a hard-wired Teensy. Copy the code shown below, make a new sketch in Arduino, paste the code into that sketch, save it as AtariFruit\_Joystick.ino, and then upload it to your Feather. Here are the mappings: - UP on pin 15 - DOWN on pin 7 - LEFT  on pin 11 - RIGHT on pin 16 - FIRE on pin 30 https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/AtariFruit_Joystick/AtariFruit_Joystick.ino If you're dying to jump ahead and test out the code before we wire up the joystick, I get it! -- you can try pairing the Feather with your iOS device and grounding each of the assigned pins with a jumper wire. But, don't worry, we'll do more thorough pairing and testing on later in the guide if you're not sure how to go about that. Once you've uploaded the code, it's time to get inside the joystick and build the AtariFruit circuit! # AtariFruit 2600 Joystick ## Joystick Internals ![](https://cdn-learn.adafruit.com/assets/assets/000/048/847/medium800/gaming_patentjoystick.jpg?1512409358) ![](https://cdn-learn.adafruit.com/assets/assets/000/048/772/medium800/gaming_PC030005_2k.jpg?1512358341) The CX-40 is very simple inside, to be sure, and incredibly robust. It consists of a single printed circuit board (PCB) with five contact switches/traces and a ground plane. These are for up, down, left, and right joystick directions, and the fire button. Normally, these switches are connected directly to the 2600 console by plugging in the cable which is wired to the PCB. Each switch, when pressed, closes a circuit from it's pin to ground. Let's open it up and take a look inside. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/771/medium800/gaming_PC030009_2k.jpg?1512358329) Use a Philips screwdriver to unscrew the four screws from the bottom of the joystick. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/769/medium800/gaming_PC030014_2k.jpg?1512358292) Then you can pull open the joystick by carefully prying up the top. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/770/medium800/gaming_PC030015_2k.jpg?1512358307) There's a really good chance that 30 years worth of dust and grime has accumulated inside of the joystick. You may want to take this opportunity to wipe that off. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/764/medium800/gaming_PC030018_2k.jpg?1512358259) This is the PCB. Each one of those little metal domes is a button, which closes a contact to ground for when pressed. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/773/medium800/gaming_PC030021_2k.jpg?1512358910) We won't be using these wires so you can go ahead and take some pliers to pull the crimp connectors off of the board. ![gaming_PC030022_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/886/medium640/gaming_PC030022_2k.jpg?1512413585) ![gaming_PC030024_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/887/medium640/gaming_PC030024_2k.jpg?1512413601) Then you can remove the whole cable assembly entirely. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/776/medium800/gaming_PC030026_2k.jpg?1512358975) ![](https://cdn-learn.adafruit.com/assets/assets/000/048/777/medium800/gaming_PC030028_2k.jpg?1512358986) # AtariFruit 2600 Joystick ## Building the Circuit ![](https://cdn-learn.adafruit.com/assets/assets/000/048/824/medium800/gaming_atariFruit2600_fritzing.png?1512368897) ## Prep the PCB Instead of crimp terminal connectors, we will solder wired directly to the board. Prepare the board by tinning each pad with a bit of solder. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/778/medium800/gaming_PC030030_2k.jpg?1512359025) ![](https://cdn-learn.adafruit.com/assets/assets/000/048/780/medium800/gaming_PC030032_2k.jpg?1512359056) ## Wire Prep Now will prepare to solder connections from the PCB to the Feather microcontroller. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/782/medium800/gaming_PC030044_2k.jpg?1512359138) - Cut a short length of wire for each contact on the Atari PCB, and one for ground. I've color-coded them similarly to the original wiring. Since I didn't have brown wire I substituted it for yellow - Strip a bit of insulation off of the ends of each wire ![gaming_PC030045_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/848/medium640/gaming_PC030045_2k.jpg?1512409499) ![gaming_PC030046_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/849/medium640/gaming_PC030046_2k.jpg?1512409517) ![gaming_PC030047_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/850/medium640/gaming_PC030047_2k.jpg?1512409526) ## Solder the Feather Wires Following this guide, solder each of the direction wires and the fire button wire to the pins of the Feather microcontroller: - **YELLOW: RIGHT ** to **16** - **WHITE: UP**  to **15** - **BLUE** :  **DOWN**  to  **7** - **GREEN: LEFT to 11** - **ORANGE: FIRE ** to ** 30** Since we'll be sharing ground among a few components, wait to solder in the black wire in for now. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/786/medium800/gaming_PC030050_2k.jpg?1512359203) ## USB Breakout In order to charge the battery we will need to extend the USB port to the outside of the joystick. Prepare the USB breakout board by soldering a red wire to it's +5V and a black wire to its ground ![gaming_PC030039_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/851/medium640/gaming_PC030039_2k.jpg?1512409624) ![gaming_PC030042_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/853/medium640/gaming_PC030042_2k.jpg?1512409659) ## Switch Prep This slide switch will be used to turn the microcontroller on and off. We can do this by grounding the enable (En) pin on the Feather. - Remove one outside leg from the switch with diagonal cutters, then tin the two remaining leads - Solder a black wire to each of the switch's leads - Cover them with heat shrink tubing for insulation - Use a larger diameter piece of heat shrink to cover both legs ![gaming_PC030052_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/854/medium640/gaming_PC030052_2k.jpg?1512409782) ![gaming_PC030053_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/855/medium640/gaming_PC030053_2k.jpg?1512409793) ![gaming_PC030056_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/856/medium640/gaming_PC030056_2k.jpg?1512409802) ![gaming_PC030057_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/857/medium640/gaming_PC030057_2k.jpg?1512409829) ![gaming_PC030061_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/858/medium640/gaming_PC030061_2k.jpg?1512409869) ## Switch to Enable Pin Solder one of the wires from the switch to the enable pin. (It doesn't matter which one.) ![gaming_PC030062_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/859/medium640/gaming_PC030062_2k.jpg?1512410061) ![gaming_PC030063_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/860/medium640/gaming_PC030063_2k.jpg?1512410104) ## 5V to USB Solder the red wire from the USB breakout board to the USB pin on the microcontroller. This will be used to charge the battery. ![gaming_PC030064_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/861/medium640/gaming_PC030064_2k.jpg?1512410155) ![gaming_PC030065_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/862/medium640/gaming_PC030065_2k.jpg?1512410183) ![gaming_PC030066_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/863/medium640/gaming_PC030066_2k.jpg?1512410199) ## Shared Grounds   - We will twist together and solder the three ground wires before connecting them to the single ground pin on the Feather. One is from the switch, the second is from the USB breakout, and the third is the wire we'll be connecting to the joystick PCB This wire can get too thick to fit in the Feather's pin through hole, so be sure to use a light hand with the solder when initially joining the wire ends. - Insert the combined ground wires into the microcontroller's ground pin, then solder the connection ![gaming_PC030067_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/864/medium640/gaming_PC030067_2k.jpg?1512410278) ![gaming_PC030069_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/865/medium640/gaming_PC030069_2k.jpg?1512410325) ![gaming_PC030072_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/866/medium640/gaming_PC030072_2k.jpg?1512410334) ![gaming_PC030073_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/867/medium640/gaming_PC030073_2k.jpg?1512410343) ![gaming_PC030076_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/868/medium640/gaming_PC030076_2k.jpg?1512410351) ![gaming_PC030077_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/869/medium640/gaming_PC030077_2k.jpg?1512410525) ![](https://cdn-learn.adafruit.com/assets/assets/000/048/805/medium800/gaming_PC030078_2k.jpg?1512359734) Feed the slide switch and USB breakout board from the inside of the joystick through the hole and then to the outside. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/806/medium800/gaming_PC030081_2k.jpg?1512359751) ## Feather to PCB Traces - Now place the microcontroller inside of the joystick body as shown and placed the original PCB onto its mounting holes - Trim the pin connection wires to a proper length to fit, with just a bit of extra wiggle room. If the wires are too long they may make it difficult to fit everything inside - Next, solder the connecting wires to the original Atari PCB as shown ![gaming_PC030082_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/870/medium640/gaming_PC030082_2k.jpg?1512412022) ![gaming_PC030087_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/871/medium640/gaming_PC030087_2k.jpg?1512412033) ![gaming_PC030090_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/872/medium640/gaming_PC030090_2k.jpg?1512412059) ![gaming_PC030103_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/873/medium640/gaming_PC030103_2k.jpg?1512412068) ## Battery Power - Use a little bit of double stick foam tape to secure the battery inside of the joystick body as shown - Plug the battery's JST connector into the Feather microcontroller.  If the controller turns on, go ahead and flip the switch to turn it off ![gaming_PC030105_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/874/medium640/gaming_PC030105_2k.jpg?1512412127) ![gaming_PC030107_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/875/medium640/gaming_PC030107_2k.jpg?1512412135) ![gaming_PC030109_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/876/medium640/gaming_PC030109_2k.jpg?1512412193) ![gaming_PC030113_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/877/medium640/gaming_PC030113_2k.jpg?1512412248) ## Reassembly Tuck everything in neatly and close the case, being careful not to allow the button spring to fly off! ![](https://cdn-learn.adafruit.com/assets/assets/000/048/816/medium800/gaming_PC030114_2k.jpg?1512359969) ![](https://cdn-learn.adafruit.com/assets/assets/000/048/817/medium800/gaming_PC030116_2k.jpg?1512359979) Secure the joystick with the four original screws. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/818/medium800/gaming_PC030119_2k.jpg?1512359994) ## Switch and USB Port - To secure the slide switch and USB breakout to the joystick's cable port, use some double stick foam tape - To maintain the look of the controller, you can blacken the edges of the tape with permanent marker ![gaming_PC030123_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/878/medium640/gaming_PC030123_2k.jpg?1512412307) ![gaming_PC030131_2k.jpg](https://cdn-learn.adafruit.com/assets/assets/000/048/879/medium640/gaming_PC030131_2k.jpg?1512412315) ## Charge It Now, you'll be able to plug in the USB cable whenever you need to charge the battery. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/821/medium800/gaming_PC030134_2k.jpg?1512360034) Excellent! The joystick is now wireless and ready for play. ![](https://cdn-learn.adafruit.com/assets/assets/000/048/823/medium800/gaming_PC030138_2k.jpg?1512360112) ![](https://cdn-learn.adafruit.com/assets/assets/000/048/822/medium800/gaming_PC030137_2k.jpg?1512360044) # AtariFruit 2600 Joystick ## Playing Games ## Bluetooth Pairing Before you can play, you'll need to pair the controller with your iPad or iPhone. This is a simple as turning on the joystick and then heading to the Bluetooth settings on your device and choosing the new item listed at the bottom called "AtariFruit Joystick." ![](https://cdn-learn.adafruit.com/assets/assets/000/048/826/medium800/gaming_IMG_0927.png?1512401099) You'll be prompted to accept the pairing request. Go ahead and tap "pair". ![](https://cdn-learn.adafruit.com/assets/assets/000/048/827/medium800/gaming_IMG_0932b.png?1512401238) Now, you'll see the AtariFruitJoystick" has been added to the Bluetooth devices list, with the "Connected" status. It's ready to go! ![](https://cdn-learn.adafruit.com/assets/assets/000/048/828/medium800/gaming_IMG_0933b.png?1512401356) Once paired, you can test it out by heading to a note-taking app and moving the joystick in all four directions as well as pressing the fire button. You'll see a letter "typed" each time you press or release the joystick from a particular direction, or shoot with the button. That's great, it means everything is working! ![](https://cdn-learn.adafruit.com/assets/assets/000/048/829/medium800/gaming_IMG_F0D3ABFCBCA8-1.jpeg?1512401592) Info: ## Play Time All that's left is to play! Look for games in the app store that are iCade compatible. The Atari official collection is a great place to start, with it's huge list of 2600 games, all of which use the joystick and single button for control. How about some Adventure? ![](https://cdn-learn.adafruit.com/assets/assets/000/048/830/medium800/gaming_PC030146_2k.jpg?1512404071) ![](https://cdn-learn.adafruit.com/assets/assets/000/048/831/medium800/gaming_PC030151_2k.jpg?1512404095) Another really fun one is Ms. Pac-Man, which, in all honesty should never be played without a joystick! ![](https://cdn-learn.adafruit.com/assets/assets/000/048/881/medium800/gaming_PC030140_2k.jpg?1512412442) ![](https://cdn-learn.adafruit.com/assets/assets/000/048/883/medium800/gaming_PC030141_2k.jpg?1512412521) Enjoy your new/old, wireless classic gaming joystick! ## Featured Products ### Adafruit Feather nRF52 Bluefruit LE [Adafruit Feather nRF52 Bluefruit LE](https://www.adafruit.com/product/3406) The **Adafruit Feather nRF52 Bluefruit** is another easy-to-use all-in-one Bluetooth® Low Energy board, with a native-Bluetooth® chip, the nRF52832!  It's our take on an 'all-in-one' Arduino-compatible + Bluetooth® Low Energy with built in USB and... 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Able to handle up to 200°C and up to 600V, it will do when PVC covered wire wimps out. We like this wire for being extremely supple and flexible, so it is great for wearables or projects where the wire-harness has to... Out of Stock [Buy Now](https://www.adafruit.com/product/1878) [Related Guides to the Product](https://learn.adafruit.com/products/1878/guides) ### Silicone Cover Stranded-Core Wire - 2m 26AWG Yellow [Silicone Cover Stranded-Core Wire - 2m 26AWG Yellow](https://www.adafruit.com/product/1879) Silicone-sheathing wire is super-flexible and soft, and its also strong! Able to handle up to 200°C and up to 600V, it will do when PVC covered wire wimps out. We like this wire for being extremely supple and flexible, so it is great for wearables or projects where the wire-harness has to... No Longer Stocked [Buy Now](https://www.adafruit.com/product/1879) [Related Guides to the Product](https://learn.adafruit.com/products/1879/guides) ### Silicone Cover Stranded-Core Wire - 2m 26AWG Red [Silicone Cover Stranded-Core Wire - 2m 26AWG Red](https://www.adafruit.com/product/1877) Silicone-sheathing wire is super-flexible and soft, and its also strong! Able to handle up to 200°C and up to 600V, it will do when PVC covered wire wimps out. We like this wire for being extremely supple and flexible, so it is great for wearables or projects where the wire-harness has to... 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