Ghostly one button MIDI controller (M3)

thingiverse

Watch - http://youtu.be/knAKApxZn7c We're making a DIY one button MIDI controller and we're sharing it as open source! All you need is an Arduino (Leonardo) and a potentiometer to create this fun project. We're using Ableton Live to play some awesome beats! To build your own, just follow these easy steps: Open the zip file that contains all the files you need to print. Print both parts of the design on your 3D printer: M3_bottom_v1.stl and M3_top_and_knob_v1.stl. Use a 100% infill setting and don't worry about supports - they're not needed! Now, let's get started with building our MIDI controller: You'll need one Arduino Leonardo board and one potentiometer (10K). To begin, you'll need to install the Arduino IDE software on your computer. Next, download the Teensyduino add-on and follow these simple installation steps: Go to http://arduino.cc/en/main/software to get started! Follow these easy steps to set up your Teensyduino board: * Install the Teensyduino Add-on from: https://www.pjrc.com/teensy/td_download.html * Mount the board as a TeenOnArdu board in your Arduino IDE software. * In the USB settings, choose MIDI as the device type. Upload this code to your board using the Arduino IDE: You'll need to make sure you have the correct files installed. Here's what you need to do: #include Set up the MIDI channel number by changing the "const int channel = 1;" line to match your preferred channel number. Configure the MIDI continuous controllers for each analog input: const int controllerA0 = 10; // sets pan position const int controllerA1 = 11; // sets volume/expression level const int controllerA2 = 91; // sets reverb level const int controllerA3 = 93; // sets chorus level In the setup() function, you can add your custom code to get started. The following lines of code will store previously sent values and detect changes: int previousA0 = -1; int previousA1 = -1; int previousA2 = -1; int previousA3 = -1; To send MIDI messages 50 times per second, you can use the elapsedMillis function: elapsedMillis msec = 0; Now, it's time to loop through each analog input and transmit the changes: loop() if (msec >= 20) { msec = 0; int n0 = analogRead(A0) / 8; int n1 = analogRead(A1) / 8; int n2 = analogRead(A2) / 8; int n3 = analogRead(A3) / 8; If any of the analog inputs have changed, transmit the MIDI messages using these functions: usbMIDI.sendControlChange(controllerA0, n0, channel); previousA0 = n0; ... Make sure to discard incoming MIDI messages in your Teensy controller to avoid conflicts: while (usbMIDI.read()) { ignore incoming messages } Mount the M3 case with the potentiometer plug connected to any Analog port on Arduino. You're now ready to rock!