Minecraft-Computercraft-buildcraftEnergyMonitorReader

EnergyReader = {
    cell = nil,
    controllerCompID = 89,
    modem = nil,
}
function EnergyReader:findRedstoneCell()
    for _, side in pairs(rs.getSides()) do
        if peripheral.getType(side) == "redstone_energy_cell" then
            self.cell = peripheral.wrap(side)
            return true
        end
    end

    return false
end
function EnergyReader:findWirelessModem()
    for _, side in pairs(rs.getSides()) do
        if peripheral.getType(side) == "modem" then
            self.modem = rednet.open(side)
            return true
        end
    end

    return false
end
function EnergyReader:readEnergy()
    return self.cell.getEnergyStored()
end
function EnergyReader:updateController(energy)
    local message = "energyStored:" .. tostring(energy)
    rednet.send(self.controllerCompID, message)
end
function EnergyReader:mainLoop()
    os.startTimer(30)
    while true do
        event, param1, param2, param3 = os.pullEvent()
        if event == 'timer' then
            print("Updating controller")
            local stored = self:readEnergy()
            self:updateController(stored)
            os.startTimer(30)
        end
    end
end

er = EnergyReader
er:findRedstoneCell()
er:findWirelessModem()
er:mainLoop()