Just to add a couple of things: You could always improve the resolution of the design by increasing the number of diodes (9x9) for increased step sensitivity, or at least include a center beam to prevent corner step "cheating".
There would also have to be very precise alignment of the diodes to place them /very/ close to the ground. Even then, if there was any difference between the time when foot touches the ground (tactile feedback) and when it registers the step (slightly above ground) it could be the difference between a AAA and AA.
As for another solid state design, there was someone who built a capacitance based pad a while back. Interesting in concept XD http://www.spritesmods.com/?art=ddrmat
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Just to add a couple of things:
You could always improve the resolution of the design by increasing the number of diodes (9x9) for increased step sensitivity, or at least include a center beam to prevent corner step "cheating".
There would also have to be very precise alignment of the diodes to place them /very/ close to the ground. Even then, if there was any difference between the time when foot touches the ground (tactile feedback) and when it registers the step (slightly above ground) it could be the difference between a AAA and AA.
As for another solid state design, there was someone who built a capacitance based pad a while back. Interesting in concept XD
http://www.spritesmods.com/?art=ddrmat