dont have much..>.<....have to plan out something...if teacher aprove, then will order the component...>.< what's ur idea?..mind telling?..O..also the reason on the schmitt trigger is to stable the logic so the mircocontroller wont gone "crazy" till to the jumping voltage coming out from 741 output....
I'll try to suggest something.
What you need is a schmitt that will switch over at about +2.5V and gives a close to 0V and close to +5V swing.
If you had any components it would be easy to do, but without any components its difficult.
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