turtleDrum

local signalSide = "bottom"
local drum = peripheral.wrap("front")
local rTank = peripheral.wrap("back")
local limit = -256000
--local limit = -3500000
local tank, rtank

while true do
  rtank = rTank.getTankInfo("in")
  if(rtank and rtank[1] and rtank[1].amount-rtank[1].capacity >= limit) then
    print("Trying to place new drum.")
    if not turtle.detect() then
      --encourage block placer to do his job
      redstone.setOutput(signalSide,true)
      sleep(1)
      redstone.setOutput(signalSide,false)
    end
  end
  if turtle.detect() then
    drum = peripheral.wrap("front")
    if drum then
      tank = drum.getTankInfo("in")
      if(tank and tank[1] and tank[1].amount-tank[1].capacity>=0) then
        turtle.dig()
       -- redstone.setOutput(signalSide,true)
       -- sleep(1)
       -- redstone.setOutput(signalSide,false)
      end
    end
  end
  sleep(30)
end