fun backwards(steps: Int)
	do
		for s in [0..steps[ do
			set(true, false, false, true)
			delay.bcm2835_delay
			set(false, false, false, true)
			delay.bcm2835_delay
			set(false, false, true, true)
			delay.bcm2835_delay
			set(false, false, true, false)
			delay.bcm2835_delay
			set(false, true, true, false)
			delay.bcm2835_delay
			set(false, true, false, false)
			delay.bcm2835_delay
			set(true, true, false, false)
			delay.bcm2835_delay
			set(true, false, false, false)
			delay.bcm2835_delay
		end
	end