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How about a person's reflex? Maybe I could use something like that? Surely when he feels pain, he'd experience something like a reflex, and his leg would jerk away automatically.
Anyway, a friend advised me that if I should use an FSR, I'll be needing a comparator for that.
Or Your friend could have thought of comparator being used as Schmitt Trigger, when certain voltage is reached comparator output goes HIGH (or low) causing Pin Level Shift interrupt in microcontroller. That is not very good solution as fine-tuning of pressure detection would have to be done by changing hardware, [...]