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[PIC] Making a three storey elevator without level sensor

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In principle this seems to be a question whether we should try to make a system which tracks its movements so accurately, that it needs no external reference.

Perhaps we can do so. However if the internal reference ever gets a tiny bit out of adjustment, then it won't work right. The inconvenience to people could become a crisis.

It is almost certain to get out of adjustment sooner or later. Therefore we should make it so it recognizes external references.
 
You can use timing... Calculate time it takes to move from a storey to another.. you have to be very accurate. Also put there a "Watch Dog".
 

Another less elegant way might be to use a stepper motor with hard mechanical end stops at upper and lower levels.

When you first turn on the power you have no idea where the lift is.
So you drive it either all the way up, or all the way down against an end stop and then cut the power after a sufficient delay time for the lift to reach there from any position.
Then you can step it back to the mid level, or either up or down by counting steps.

Its similar in a way to the solution in post #2, except it will use RELATIVE counting instead of absolute counting which would be better.
 

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