Fruit Piano prototype with MPR121, Arduino and Sonic Pi

README.md

Video: https://twitter.com/mcoms/status/595568459766988800

1. Load and wire your Arduino with the code/schematic from Sparkfun
2. Make sure you use 3.3V maximum for everything
3. Connect fruit and veg to MPR121 pins 3, 6 and 9
4. Start Sonic Pi
5. Run the Ruby code

This was just a prototype to prove the concept. Next up will be interfacing the module directly with the GPIO on Raspberry Pi, to aleviate some of the latency issues that come from the Arduino and Serial port.

Gemfile

source 'https://rubygems.org'
gem 'osc-ruby', '1.1.1'
gem 'serialport'

synth.rb

require 'bundler'
Bundler.require

# OSC client to communicate with Sonic Pi (which must be running)
client = OSC::Client.new 'localhost', 4557

# Set your arduino serial port here...
port_str = '/dev/tty.usbserial'
baud_rate = 9600
data_bits = 8
stop_bits = 1
parity = SerialPort::NONE

sp = SerialPort.new port_str, baud_rate, data_bits, stop_bits, parity

while true do
  while (i = sp.gets.chomp) do
    if i == 'pin 3 was just touched'
      puts 'Banana'
      client.send OSC::Message.new('/run-code', 'play chord(:C4, :major)')
    elsif i == 'pin 6 was just touched'
      puts 'Potato'
      client.send OSC::Message.new('/run-code', 'play chord(:F4, :major)')
    elsif i == 'pin 9 was just touched'
      puts 'Apple'
      client.send OSC::Message.new('/run-code', 'play chord(:G4, :major)')
    end
  end
end

sp.close