startup.lua

local redOut = 0
local battery = peripheral.wrap("left")
while true do
    energy, maxEnergy, type = battery.getEnergyStatus()
    energyPercent = (energy / maxEnergy)*100
    energyPercent = math.floor(energyPercent)
    term.clear()
    term.setCursorPos(1, 1)
    if(redstone.getAnalogInput("back") >= 14) then
        redstone.setOutput("right", false)
        redOut = 0
    elseif(energyPercent >= 100) then
        redstone.setOutput("right", false)
        redOut = 0
    elseif(energyPercent <= 90) then
        if(redstone.getAnalogInput("back") <= 5) then
            redstone.setOutput("right", true)
            redOut = 1
        end
    end
    print("Buffer: "..energyPercent.."%")
    if(redOut == 1) then
        print("Reactor: running")
    else
        print("Reactor: stopped")
    end
    os.sleep(1)
end