power

maxEnergy = peripheral.call("front", "getMaxEnergy")
on = true
while(true) do
    currentEnergy = peripheral.call("front", "getEnergy")
    if(currentEnergy / maxEnergy < 0.1) then
        on = true
    end
    if(currentEnergy / maxEnergy > 0.9) then
        on = false
    end
    if(on) then
        redstone.setAnalogOutput("bottom", 15)
    else
        redstone.setAnalogOutput("bottom", 0)
    end
    os.sleep(5)
end