percent = 0
max = 0
cur = 0
function updateData()
  local p = peripheral.find("draconic_rf_storage")
  local m = peripheral.find("monitor")
  if m ~= nil then
    if p ~= nil then
      m.setTextScale(0.5)
      max = p.getMaxEnergyStored()
      cur = p.getEnergyStored()
      percent = cur / max
      local width , height = m.getSize()
      local letters = math.floor((width - 4) * percent)
      local spaces = (with - 4) - letters
      m.setCursorPos(1, 1)
      local l_active = ""
      while string.len(l_active) < letters do
        l_active ..= "|"
      end
      while string.len(l_space) < spaces do
        l_space  ..= "."
      end
      m.setTextColor(colors.lime)
      m.write(l_active)
      m.setTextColor(colors.gray)
      m.write(l_space)
    end
  end
end