startup

local outputstate = true
local inputstate = 1

while true do
  inputstate = redstone.getAnalogInput("back")

  if outputstate == true then
    if inputstate <= 1 then
      outputstate=false
    else
      print ("Discharging, power at "..inputstate)
    end
  else
    if inputstate >=14 then
      outputstate=true
    else
      print ("Charging, power at "..inputstate)
    end
  end

  redstone.setOutput("left",outputstate)
  os.sleep(2)
end