Energy monitor RF

-- Config
width = 15
height = 40
interval = 3
title = "Biomass"
cell = peripheral.wrap("thermalexpansion:storage_cell_3")
monitor = peripheral.wrap("monitor_2")


monitor.setTextColor(colors.white)
monitor.setTextScale(0.5)

-- Update screen
function update()
    print("Update")
    -- Calculate energy
    stored = cell.getEnergyStored()
    total = cell.getEnergyCapacity()
    p = math.floor((stored/total) * 10000.0) / 100.0
    h = (stored/total) * height

    -- Draw box
    prev = term.redirect(monitor)
    paintutils.drawFilledBox(0, 0, width, height, colors.black)
    paintutils.drawFilledBox(0, height-h, width, height, colors.blue)
    term.redirect(prev)

    -- Draw text
    monitor.setBackgroundColor(colors.black)
    monitor.setCursorPos(1, 1)
    monitor.write(title)
    monitor.setCursorPos(1, 2)
    monitor.write(p .. "%")
end

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