local check, first, tc
local waiting = false

redstone.setBundledOutput("back",0)
redstone.setAnalogOutput("left",0)

local t,p = turtle.inspectDown()
if t == true then
  if p.metadata == 14 or
     p.metadata == 0 then
    first = true
    check = {colors.blue,
             colors.yellow}
  else
    first = false
    check = {colors.red,
            colors.white}
  end
  if p.metadata == 14 then
    tc = colors.red
  elseif p.metadata == 0 then
    tc = colors.white
  elseif p.metadata == 4 then
    tc = colors.yellow
  else
    tc = colors.blue
  end
end



while true do

  if first == true then
      print("waiting for others")
      if redstone.getBundledInput
                ("back",check[1])
      and redstone.getBundledInput
                ("back",check[2])
      then
        print("digging")
        turtle.dig()
        redstone.setBundledOutput
                      ("back", 0)
        sleep(1)
        print("planting")
        redstone.setAnalogOutput
                     ("left",15)
        sleep(1)
        redstone.setAnalogOutput
                      ("left",0)
        first = false
    end
  else
    print("waiting for growth")
    local m,j = turtle.inspect()
    if m == true then
      if j.metadata == 7 then
        redstone.setBundledOutput
                    ("back", tc)
      end
    end
  end

  sleep(1)

end