adv

local tid = 1
local delay = tonumber(tid)

function speed()
 term.clear()
 term.setCursorPos(1,1)
 print("Delay is now: ".. delay)

 local event, key = os.pullEvent("key")
  if key == keys.up then
   tid = tid+1
  elseif key == 208 then
  tid = tid-1
 end
 end

function timer()
 speed()
 rs.setOutput("back", true)
  sleep(0.3)
 rs.setOutput("back", false)
  sleep(delay)
end

repeat
 timer()


 until rs.getInput("left")
 return