t = peripheral.wrap("back")
g = peripheral.wrap("top")

maxEnergy = 900000

function shouldRun()
	shouldRun = false
	if t.getEnergyStored() < maxEnergy then
		shouldRun = true
	end
	return shouldRun
end

while true do
	rpm = t.getRotorSpeed()

	p.setActive(shouldRun())
	g.addText(5,10,"RPM: "..rpm)
	sleep(0.25)
	g.clear()
end