-- Module displaying of the words
function generateLEDs(words, color)
 
 local space=string.char(0,0,0)
 -- update the background color, if set
 if (colorBg ~= nil) then
   space = colorBg
 end

 local buf=color
 -- line 1----------------------------------------------
 if (words.itis == 1) then
    buf=color:rep(2) -- ES
    -- K fill character
    buf=buf .. space:rep(1)
    buf=buf ..color:rep(3) -- IST
    -- L fill character
    buf=buf .. space:rep(1)
 else
    buf=space:rep(7)
 end
 if (words.fiveMin== 1) then
    buf= buf .. color:rep(4) -- FUENF
  else
    buf= buf .. space:rep(4)
 end
 -- line 2-- even row (so inverted) --------------------
 if (words.twenty == 1) then
    buf= buf .. color:rep(7) -- ZWANZIG
  else
    buf= buf .. space:rep(7)
 end
 if (words.tenMin == 1) then
    buf= buf .. color:rep(4) -- ZEHN
  else
    buf= buf .. space:rep(4)
 end
 -- line3----------------------------------------------
 if (words.threequater == 1) then
    buf= buf .. color:rep(11) -- Dreiviertel
  elseif (words.quater == 1) then
    buf= buf .. space:rep(4)
    buf= buf .. color:rep(7) -- VIERTEL
 else
    buf= buf .. space:rep(11)
 end
 --line 4-------- even row (so inverted) -------------
 if (words.before == 1) then
    buf=buf .. space:rep(2) 
    buf= buf .. color:rep(3) -- VOR
  else
    buf= buf .. space:rep(5)
 end
 if (words.after == 1) then
    buf= buf .. color:rep(4) -- NACH
    buf= buf .. space:rep(2) -- TG
  else
    buf= buf .. space:rep(6)
 end
 ------------------------------------------------
 if (words.half == 1) then
    buf= buf .. color:rep(4) -- HALB
    buf= buf .. space:rep(1) -- X
  else
    buf= buf .. space:rep(5)
 end
 if (words.twelve == 1) then
    buf= buf .. color:rep(5) -- ZWOELF
    buf= buf .. space:rep(1) -- P
  else
    buf= buf .. space:rep(6)
 end
 ------------even row (so inverted) ---------------------
 if (words.seven == 1) then
    buf= buf .. color:rep(6) -- SIEBEN
    buf= buf .. space:rep(5)
  elseif (words.one == 1) then
    buf= buf .. space:rep(5)
    buf= buf .. color:rep(4) -- EINS
    buf= buf .. space:rep(2)
 elseif (words.two == 1) then
    buf= buf .. space:rep(7)
    buf= buf .. color:rep(4) -- ZWEI
 else
    buf= buf .. space:rep(11)
 end
 ------------------------------------------------
 if (words.three == 1) then
    buf= buf .. space:rep(1)
    buf= buf .. color:rep(4) -- DREI
    buf= buf .. space:rep(6)
  elseif (words.five == 1) then
    buf= buf .. space:rep(7)
    buf= buf .. color:rep(4) -- FUENF
 else
    buf= buf .. space:rep(11)
 end
 ------------even row (so inverted) ---------------------
 if (words.four == 1) then
    buf= buf .. color:rep(4) -- VIER
    buf= buf .. space:rep(7)
  elseif (words.nine == 1) then
    buf= buf .. space:rep(4)
    buf= buf .. color:rep(4) -- NEUN
    buf= buf .. space:rep(3)
 elseif (words.eleven == 1) then
    buf= buf .. space:rep(8)
    buf= buf .. color:rep(3) -- ELEVEN
 else
    buf= buf .. space:rep(11)
 end
 ------------------------------------------------
 if (words.eight == 1) then
    buf= buf .. space:rep(1)
    buf= buf .. color:rep(4) -- ACHT
    buf= buf .. space:rep(6)
  elseif (words.ten == 1) then
    buf= buf .. space:rep(5)
    buf= buf .. color:rep(4) -- ZEHN
    buf= buf .. space:rep(2)
 else
    buf= buf .. space:rep(11)
 end
 ------------even row (so inverted) ---------------------
 if (words.clock == 1) then
    buf= buf .. color:rep(3) -- UHR
  else
    buf= buf .. space:rep(3)
 end
 if (words.six == 1) then
    buf= buf .. space:rep(2)
    buf= buf .. color:rep(5) -- SECHS
    buf= buf .. space:rep(1)
  else
    buf= buf .. space:rep(8)
 end
 
 if (words.min1 == 1) then
    buf= buf .. color:rep(1)
  else
    buf= buf .. space:rep(1)
 end
 if (words.min2 == 1) then
    buf= buf .. color:rep(1)
  else
    buf= buf .. space:rep(1)
  end
 if (words.min3 == 1) then
    buf= buf .. color:rep(1)
  else
    buf= buf .. space:rep(1)
  end
 if (words.min4 == 1) then
    buf= buf .. color:rep(1)
  else
    buf= buf .. space:rep(1)
  end
  collectgarbage()
  return buf
end