ComputerCraft Energy Cell

-- Transmitting energy cell percentage
display_line = 1
display_name = "Biofuel Cell"
display_unit = "RF"

cell_side = "back"
modem_side = "top"
modem_channel = 100
send_interval = 3

-- Init
cell = peripheral.wrap(cell_side)
modem = peripheral.wrap(modem_side)
modem.open(modem_channel)

function update()
    stored = cell.getEnergyStored()
    total = cell.getEnergyCapacity()
    msg = textutils.serialize({display_line, display_name, stored, total, display_unit})
    print("Sent message")
    print(msg)
    modem.transmit(modem_channel, modem_channel, msg)
end

-- Run endlessly
print("Started")
timer = os.startTimer(1)
while true do
    event, param = os.pullEvent()
    if event == "key" then
        break
    elseif event == "timer" and param == timer then
        update()
        timer = os.startTimer(send_interval)
    end
end
print("Stopped")