What does that mean? The mine cart rolls along and follows each of four different paths sequentially. Every time the cart rolls over a sensor rail, it sends a pulse to a pair of cascaded T flip-flops that count to four. The outputs of the flip-flops drive sticky-piston switches which select each of the four tracks for the cart.
Sorry, this is my first attempt at video capture with Microsoft Expression. I somehow managed to lose the daytime recording which looks much better. There's no audio yet either. This was edited in KdenLive, and I haven't yet figured out how to record a voice-over track.
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