etch-a-sketch.rb

require 'arduino_firmata'
require 'l8'

l8 = L8::Smartlight.new "/dev/ttyACM0"
puts "Connected to L8"
l8.clear_matrix
l8.set_brightness(:low)

arduino = ArduinoFirmata.connect "/dev/ttyACM1"
puts "Connected to Arduino"
arduino.pin_mode 0, ArduinoFirmata::INPUT

puts "Starting main loop"
while true do
  x = ((arduino.analog_read 0).to_f / 128.0).ceil - 1
  y = ((arduino.analog_read 1).to_f / 128.0).ceil - 1
  reset = arduino.digital_read 0

  if x < 0
    x = 0
  end

  if y < 0
    y = 0
  end

  puts "x: #{x}, y: #{y}"
  l8.set_led(x, y, 15, 15, 15)

  if reset
    l8.clear_matrix
  end

  sleep 0.1
end