while true do
  local power = redstone.getAnalogInput("back")
  print("Signal detected: " .. power)
  if power > 10 then
    print("Discharging...")
	while power > 7 do
      redstone.setOutput("front", true)
	  os.sleep(0.4)
	  redstone.setOutput("front", false)
	  os.sleep(0.4)
      local new_power = redstone.getAnalogInput("back")
	  if power ~= new_power then
		print("Signal decreased: " .. new_power);
      end
      power = new_power
    end
    print("Discharge complete")
  end
  print("Waiting for signal change...")
  os.pullEvent("redstone")
end