letters v6

letters = {
  32415, 32427, 14897, 32302,
  32433, 32400, 14899, 31903,
  18417, 19007, 31899, 31777,
  32159, 32271, 14894, 32392,
  14895, 32395, 14006, 17392,
  31807, 30782, 31967, 27803,
  24824, 20153, 0
}

print("Please enter your message: ")
message = string.upper(read())
message = string.gsub(message, "[^A-Z ]", "")
print("Outputting '"..message.."'")

letterMap = "ABCDEFGHIJKLMNOPQRSTUVWXYZ "

turtle.select(1)

length = message:len()
for l=1,length do
  letter = message:sub(l, l)

  index = letterMap:find(letter)
  if index == nil then
    index = 27
  end
  print("'"..letter.."' => "..index)
  num = letters[index]

  for x=0,2 do
    column = math.floor(num/math.pow(32, 2-x))
    if column > 0 then
      for y=1,5 do
        if column % 2 == 1 then
          while not turtle.placeDown() and turtle.getSelectedSlot() < 16 do
            turtle.select(turtle.getSelectedSlot() + 1)
          end
        end
        column = math.floor(column / 2)
        turtle.forward()
      end
      for y=1,5 do
        turtle.back()
      end
    end
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
  end

  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
end

turtle.turnLeft()
for i=1,length*4 do
  turtle.forward()
end
turtle.turnRight()