local hopper = 'right'
local extractor = 'bottom'
local locker = 'top'
local engine = 'back'
local state = 'disabled'
redstone.setOutput(hopper, true)
redstone.setOutput(engine, true)
while true do
	if state == 'disabled' then
		if redstone.getInput(locker) == true then
			print('Items for processing')
			redstone.setOutput(hopper, false)
			redstone.setOutput(engine, false)
			state = 'enabled-starting'
		end
	elseif state == 'enabled-starting' then
		print('Waiting on extractor start')
		if redstone.getInput(extractor) == false then
			 state = 'enabled'
		end
	elseif state == 'enabled' then
		if redstone.getInput(extractor) == true then
			print('Processing complete')
			redstone.setOutput(hopper, true)
			redstone.setOutput(engine, true)
			state = 'disabled'
		end
	end
	sleep(1)
end