TankLevelSupervisor

side = "right"
wait = 30
lowLiquidLevel = 100000

tank = peripheral.wrap(side)

--disable production by default
rs.setOutput("back",true)
refilling=false

function tankAmount()
    tanksTable = tank.getTankInfo("unknown")
    maintank = tanksTable[1]
    return maintank.amount
end

function tankCapacity()
    tanksTable = tank.getTankInfo("unknown")
    maintank = tanksTable[1]
    return maintank.capacity
end

function tankIsLow()
    return tankAmount() < lowLiquidLevel
end

function tankIsFull()
    return tankAmount() > tankCapacity()-1000
end

function printStatus()
  status=""
  if refilling then status="refilling" else status="filled" end
    print("Tank Status :   "..status.." ("..tankAmount().."mB / "..tankCapacity().."mB)")
end

while(true) do
  print("...Sleeping for "..wait.."s...")
  sleep(30)
  printStatus()

  if tankIsLow() then
    if refilling==false then
      --Resume production when level is low
      print("Tank level is low : production will be resume.")
      rs.setOutput("back",false)
      refilling=true
    end
  else
    if tankIsFull() and refilling then
      --Stop the production when the tank has been refilled
        print("Tank level is full : production will be paused.")
        rs.setOutput("back",true)
    end
  end
end