Energy cell power monitor v3

-- Monitors TE3 Energy cells and EnderIO capacitor banks and output redstone signals once energy storage drops below set limits.
-- Will automatically detect direction of adjacent storage device and (optional) Advanced Monitors. If chosen, monitor format should be 1 high and 2 wide. Now also with wired modem support for both storage and monitors. Directly adjacent devices will take priority over any wired devices.
-- Redstone signal for the engines will be output out the back of the computer.
--More details: http://forum.feed-the-beast.com/threads/rhns-1-6-monster-build-journal-and-guide-collection.42664/page-15#post-718973


local upper = 0.90 --Upper limit for computer to stop transmitting redstone signal. 0.90=90% full.
local lower = 0.10 --Lower limit for computer to start transmitting redstone signal.


--Device detection
isError=0

function detectDevice(DeviceName)
DeviceSide="none"
for k,v in pairs(redstone.getSides()) do
 if peripheral.getType(v)==DeviceName then
   DeviceSide = v
   break
 end
end
  return(DeviceSide)
end


cell="none"
monitor="none"
local peripheralList = peripheral.getNames()

CellSide=detectDevice("cofh_thermalexpansion_energycell")

if CellSide~="none" then
   cell=peripheral.wrap(CellSide)
   print ("TE Energy cell on the " .. CellSide .. " connected.")
   else
    CellSide=detectDevice("tile_enderio_blockcapacitorbank_name")
    if CellSide~="none" then
        cell=peripheral.wrap(CellSide)
        print ("EnderIO capacitorbank on the " .. CellSide .. " connected.")
    else
            for Index = 1, #peripheralList do
                if string.find(peripheralList[Index], "cofh_thermalexpansion_energycell") then
                    cell=peripheral.wrap(peripheralList[Index])
                    print ("TE Energy cell on wired modem: "..peripheralList[Index].." connected.")
                elseif string.find(peripheralList[Index], "tile_enderio_blockcapacitorbank_name") then
                    cell=peripheral.wrap(peripheralList[Index])
                    print ("EnderIO capacitorbank on wired modem: "..peripheralList[Index].." connected.")
                end
            end --for
            if cell == "none" then
                print("No Energy storage found. Halting script!")
                return
            end

    end
end


MonitorSide=detectDevice("monitor")

if MonitorSide~="none" then
      monitor=peripheral.wrap(MonitorSide)
   print ("Monitor on the " .. MonitorSide .. " connected.")
   else
    for Index = 1, #peripheralList do
        if string.find(peripheralList[Index], "monitor") then
            monitor=peripheral.wrap(peripheralList[Index])
            print ("Monitor on wired modem: "..peripheralList[Index].." connected.")
        end
    end --for
    if monitor == "none" then
        print ("Warning - No Monitor attached, continuing without.")
    end
end

--Main code
redstone.setOutput("back", false) --Defaulting to off

--If monitor is attached, write data on monitor
if monitor ~= "none" then
    monitor.clear()
    monitor.setBackgroundColour((colours.grey))
    monitor.setCursorPos(1,4)
    monitor.write(" ON ")
    monitor.setBackgroundColour((colours.green))
    monitor.setCursorPos(5,4)
    monitor.write(" OFF ")
    monitor.setBackgroundColour((colours.black))
end

--Main loop
while true do
    --Get storage values
    eNow = cell.getEnergyStored("unknown")
    eMax = cell.getMaxEnergyStored("unknown")

    --Compute ratio
    fill = (eNow / eMax)

--If monitor is attached, write data on monitor
if monitor ~= "none" then

    if eMax >= 10000000 then
    monitor.setCursorPos(11,2)
    monitor.write("Storage:")
    monitor.setCursorPos(11,3)
    monitor.write(math.ceil(eNow/1000).."kRF")
    monitor.setCursorPos(11,4)
    monitor.write("Of:")
    monitor.setCursorPos(11,5)
    monitor.write(math.ceil(eMax/1000).."kRF")
    else
    monitor.setCursorPos(11,2)
    monitor.write("Storage:")
    monitor.setCursorPos(11,3)
    monitor.write(math.ceil(eNow))
    monitor.setCursorPos(11,4)
    monitor.write("Of:")
    monitor.setCursorPos(11,5)
    monitor.write(math.ceil(eMax))
    end

    monitor.setCursorPos(1,2)
    monitor.write("Engines:")
end

    if fill > upper then
        --energylevel is over upper level, turning redstone signal off
        redstone.setOutput("back", false)

        if monitor ~= "none" then
            monitor.setBackgroundColour((colours.grey))
            monitor.setCursorPos(1,4)
            monitor.write(" ON ")
            monitor.setBackgroundColour((colours.green))
            monitor.setCursorPos(5,4)
            monitor.write(" OFF ")
            monitor.setBackgroundColour((colours.black))
        end

    elseif fill < lower then
        --energy level is below lower limit, turning redstone signal on
        redstone.setOutput("back", true)

        if monitor ~= "none" then
            monitor.setBackgroundColour((colours.green))
            monitor.setCursorPos(1,4)
            monitor.write(" ON ")
            monitor.setBackgroundColour((colours.grey))
            monitor.setCursorPos(5,4)
            monitor.write(" OFF ")
            monitor.setBackgroundColour((colours.black))
        end
    end


    sleep(1)
end --while