single component signal detector

[tj3]

Given a rotor with 6 magnets of alternating polarity, I need to count
the steps as the rotor turns. I've got a coil next to the rotor as a
sensor. The question is how to turn the coil signal (current) into a
pulse train that an MCU can count.

Would a sensitive-gate SCR work?

/tj3

 

[JeffM]

tj3 wrote:

Given a rotor with 6 magnets of alternating polarity,
I need to count the steps as the rotor turns.
I've got a coil next to the rotor as a sensor.
The question is how to turn the coil signal (current)
into a pulse train that an MCU can count.

You're not ready to post to a *components* group yet.

Put a scope on the sensor (coil) and quantify what you have.
Load it several ways and see how it changes.
Once you have some VALUES about *how much*,
THEN you can start thinking about *how* and *what*.

 

[tj3]

On Jul 3, 3:22 pm, JeffM <jef...@email.com> wrote:

tj3 wrote:
Given a rotor with 6 magnets of alternating polarity,
I need to count the steps as the rotor turns.
I've got a coil next to the rotor as a sensor.
The question is how to turn the coil signal (current)
into a pulse train that an MCU can count.

You're not ready to post to a *components* group yet.

Put a scope on the sensor (coil) and quantify what you have.
Load it several ways and see how it changes.
Once you have some VALUES about *how much*,
THEN you can start thinking about *how* and *what*.

OIC. I should built it *BEFORE* iI design it. Thanks, but even I
know better than that.

BTW, you aren't ready to post a reponse to a query in any news
group. If I had to bet it would be that you never will be.

/tj3

P.S. The known values are as follows:
50 MGOe NIB magnet, D=750 um, T=750 um.
air gap : 100+/=15 um
coil : D=500 um (A=2.5e-7m^2), turns=40
Vrel = 100 m/s