Preparing the Raspberry Pi. Download a recent version of Raspbian this Tutorial was made with Jessie, Release 20170302, but any later version should work. I made a xylophone that uses an Arduino Mega to detect when a note is struck, and generate MIDI output. This project is wondeful because I essentially made a. If you havent solved it yet, you might be in luck I just wrote and released released minutes ago, I saved a link to this post an Arduino library for the 24XX1025. Serial Multiplexer Arduino' title='Serial Multiplexer Arduino' />Multiplexer. Multiplexing is the property of combining one or more signals and transmitting on a single channel. This is achieved by the device multiplexer. The MPU6050 is a serious little piece of motion processing tech By combining a MEMS 3axis gyroscope and a 3axis accelerometer on the same silicon die t. Transform an Ikea Side Table into a Music Visualizer. Photography by Hep Svadja. Heres a table I bought from Ikea and inserted loads of LEDs, electronics, and a microphone into, so I can put it next to the stereo and have a display that reacts and dances to the music played. Its great for parties, and it makes a superb conversation piece. Its got an Arduino for a brain and uses a minimal amount of current, so you can run it off an i. Pad charger or any USB port thats handy. Plug it in and watch each column of LEDs jump to the bass, midrange, and treble frequencies like a jumbo sized graphic equalizer or spectrum analyzer. ArduinoPov.jpg' alt='Serial Multiplexer Arduino' title='Serial Multiplexer Arduino' />Gammon Forum Electronics Microprocessors I2C TwoWire Peripheral Interface for Arduino. I based it on the Tiny Music Visualizer project from Adafruit, using their I2. C multiplexer board for a tiny 88 bicolor LED matrix. The Arduino code is from there, the circuit is from there all I really created was a big handmade LED matrix, and put it into an Ikea table I did troubleshoot a couple of glitches for you I found that if I connected the circuit as described by Adafruit, with a common ground for the microphone and the display, the results were erratic. If you connect the circuit as Ill show here, using separate grounds on the Arduino board, it works fine. I also found that Chinese Arduino Nano clones did not run the code properly. Switching to the full sized Uno solved this problem. Build Your Own Music Visualizer Table. Modify the table. Start with an Ikea Lack table, about 1. The matte white was on sale, so thats what I used. Draw a square in the center of the tabletop Figure A mine was 1. Figure ACarefully cut out the square from the tabletop and set it aside Figures B and C. Figure BTIP First drill a hole inside one corner of your square, or make a preliminary cut on your line using a Dremel. Then carefully cut the whole square out with a small handsaw, utility knife, or Dremel. Figure CRemove the corresponding 1. Figure D. This will create a space about 1 1. Figure D2. Mount the LEDs. Youll use your tabletop cutout as the mounting board for your LEDs. First, mark the big square off into 6. Figure E. Figure EIn each square, mark and drill holes for 2 LEDs one green, and one red. Put them pretty close together so their colors will blend nicely to amber when theyre both lit. To speed up marking, you can make a little template from a scrap of cardboard or hardboard. I placed green toward the upper left and red toward the lower right Figures F and G. Figure FFigure GFill the holes with the LEDs 6. Figures H and I. Take a picture with all the LEDs in place. Feel good about what youve done. Figure HFigure I3. Wire up your LED matrix. Youre just making a very large version of the common cathode matrix shown in the wiring diagram Figure J. The numbers here indicate which pins youll connect to on the Adafruit LED controller board. Figure JFirst, cut some wires and strip them, lots of them I suggest you buy a good wire stripper, I did and it made it so much easier Once you think youve got enough, cut some more Youll need 5. Each should be about 3 7cm8cm long Figure K, but this will vary depending on your array, so just check before you cut all of them. Figure KNext, to save my fat fingers whilst soldering, I twisted the wires into chains of 7 end to end so I could solder them easily without trying to hold multiple wires at once Figure L. Figure LOn the back of the LED board, bend the legs of each pair of LEDs so that their cathodes touch, but their anodes are separate. Solder all the cathodes together using the black wires Figure M, following the wiring diagram. Figure MSolder all the anodes of the red LEDs together using the red wires. Then solder all the anodes of the green LEDs together using the green wires Figure N. Finally, cut and solder 2. These will run off board to connect to the electronics Adafruit board, breadboard, and Arduino so their lengths will vary. Its easiest to locate the electronics near the bottom edge of your LED panel the front of the table but you could choose another location, just make sure these off board wires are long enough to reach. Figure NTIP You could use red for all the anodes, but we found using red and green here makes the connections a lot easier to follow later. Jenny Ching, Make Labs. Connect the electronics. Connect your newly created LED array to the Adafruit Bicolor LED backpack board by soldering its 2. LED wiring diagram Figure J you used in the previous step. As shown here in Figure O, the backpack boards pin numbers run clockwise from 1 at top right to 2. Figure ONow plug the microphone and the LED backpack board into your breadboard and use jumper wires to connect the Arduino as shown in Figures P and Q. Figure PFigure QNOTE Ive mainly used the circuit diagram from Adafruit, but Ive made one change The GND wire from the microphone goes to a different GND connection than the LED array. I found that if I used the same common GND for both, the microphone output was corrupted and the display behaved erratically and didnt respond to music at all. If you use 2 different GND pins on the Arduino Uno, everything works fine. Program the Arduino. Download the AdafruitLEDBackpack library and put it in your Arduinolibraries folder. Bus Simulator 2009 Full Version'>Bus Simulator 2009 Full Version. Download the project code, and move the ffft folder to your libraries folder too. Open the sketch Piccolo. Arduino IDE on your computer, then upload it to your Arduino board. Test the matrix and circuit by playing some music Figure R. You should see the columns of LEDs jumping and dancing to the sound Figure R6. Build the matrix grid. Cut 1. 8 strips of hardboard or cardboard approximately 1. This width is based on the depth of the table, so test fit your LED panel and electronics into the table before deciding how wide to cut your strips. On 1. 4 of the strips, use a saw to cut intersection slots every 2, to half the depth of your strip Figure S. Cyclic Encoder C Program. Figure SFor high reflectivity, I used some white laminated hardboard I found in the garage. Then I used the kids gloopy glue PVA white glue to stick reflective photo paper to the back of the hardboard, and cut it to size with a craft knife once dry. Its probably easier to just paint everything white. Now assemble the grid and hot glue the strips in place Figure T. Figure T7. Complete the table. Get a piece of plexiglass perspex the same size as your matrix. I covered mine in frosted window film, but if you can find translucent or frosted plexi in the first place, it will save you some effort. For added diffusion, I used some baking parchment paper as well. Cut a little hole in the bottom of the table to allow a USB cable to fit through Figure U. Hollow out a pocket in the honeycomb cardboard to house your electronics. Figure UNow slide the electronics into place Figure V. You can leave the microphone inside, or mount it poking out of the table someplace you like. When its all aligned to your satisfaction, you can tack the grid down to the LED panel with a few blobs of hot glue Figure W. Figure VFigure WFinally, glue the plastic top in place. I used a hot glue gun, and squeezed a thin bead between the acrylic and the tabletop Figure X. Its not substantial, but it keeps everything situated. Figure XYour table is now complete Get This Party Started. You and your Music Visualizer Table are ready to party.