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actually, this is very doable. i did some testing with the retroreflective tape and a sensor. i got returns from 20+ feet. sooo, if you mount the sensor on a servo, and make sure the servo is ALWAYS pointed at the operator, you could theoretically give bit input on that.
all in all, it's a very interesting idea. the only major problem is false input. if you accidentally pick up a stack, and make your robot change modes. so, if you're 100% certain you can eliminate false input, i say go for it. otherwise, i wouldnt' take the chance.
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