I have a little magnet and some coil.
And my question is if I move this little magnet cause of coil's magnet field,
did I possible to extract the position just use magnet sensor?
In my perspective, It can be possible doing switch of at a finding position section and done, switch on the coil.
What do you think about this method? do I success or fail cause distract of magnet field?
I think you better use a much better translator.
If I understand that garbled mess correctly:-
You cannot extract any information from a current induced by a magnet other than the fact that the coil is close to the magnet.
Grumpy_Mike:
You cannot extract any information from a current induced by a magnet other than the fact that the coil is close to the magnet.
and the coil is moving relative to the magnet.
I mean electromagnet
I mean coil is electromagnet and this can programmable so I can change its current.
Beside, there is a tiny magnet like a bar magnet.
This magnet is moved because of electromagnet and I want to know tiny magnet's movement.
And switch off mean(of is a typing error) switch off the current.
If I switch off the current, then could I possible to know its position?In short time?
I'm sorry about my typing error cause I'm so busy that time.
This magnet is moved because of electromagnet and I want to know tiny magnet's movement.
Then you can’t measure the position of the magnet without another sensor.
You can’t assume an amount of movement of a magnet for a given current through an electro magnet.
um..........
It's magnetic sensor like arduino magnetic sensor in other place.. 
just nearby..
current is only for electromagnet.
I think my describe ability is very poor..my previous post have a same problem like this..
Are you trying to mimic an inductive proximity sensor?
Would a hall-sensor help?
Electromagnetic induction only senses movement (structly just rate of flux cutting coil), hall sensors
can measure static mag field.