while true do
	sleep(1)
	mainPower = redstone.getAnalogInput("left")
	scrapPower = redstone.getAnalogInput("front")
--  print("main:" .. mainPower .. " scrap:" .. scrapPower)
	if ( mainPower > 10 and scrapPower > 12 ) then
		if ( redstone.getAnalogInput("back") == 0 ) then
			print("Turning ON - Main power : " .. mainPower .. " Scrap power : " .. scrapPower )
		end
		redstone.setAnalogOutput("back",15)
    end
	if ( mainPower < 6 or scrapPower < 1 ) then
		if ( redstone.getAnalogInput("back") == 15 ) then
			print("Turning OFF - Main power : " .. mainPower .. " Scrap power : " .. scrapPower )
		end
		redstone.setAnalogOutput("back",0)
	end
end