Clock 595 shift registers

gistfile1.rb

require "wiringpi"

#GC.disable
io = WiringPi::GPIO.new
digits = [
            [1,1,0,0,0,0,0,0], #0
            [1,1,1,1,1,0,0,1], #1
            [1,0,1,0,0,1,0,0], #2
            [1,0,1,1,0,0,0,0], #3
            [1,0,0,1,1,0,0,1], #4
            [1,0,0,1,0,0,1,0], #5
            [1,0,0,0,0,0,1,0], #6
            [1,1,0,1,1,0,0,0], #7
            [1,0,0,0,0,0,0,0], #8
            [1,0,0,1,0,0,0,0]  #9
          ]

pos = [
  [0,0,0,0,0,0,0,1],
  [0,0,0,0,0,0,1,0],
  [0,0,0,0,0,1,0,0],
  [0,0,0,0,1,0,0,0],
  [0,0,0,1,0,0,0,0],
  [0,0,1,0,0,0,0,0],
  [0,1,0,0,0,0,0,0],
  [1,0,0,0,0,0,0,0]
]

loop do
  # Example: "23254030"
  time = Time.now.strftime("%H%M%S%2N")

  # Array of digits to display, in reverse
  time_array = time.split(//).map(&:to_i).reverse

  0.upto(7) do |position|
    digit_array = digits[time_array[position]].dup
    # Enable dot every 2 digits
    digit_array[0] = 0 if (position % 2 == 0)
    io.shiftOutArray(0,1,2, digit_array+pos[position])
    sleep 0.001
  end
end