I'm a new user to EAGLE and have an assignment to design a scheme for digital in (position sensor (Angle sensor?) for a motor). I would very much appreciate help, I don't know where to start. Thanks.

 

For DC/BLDC motors, this is typically done with a rotary encoder, two types are digital and quadrature, the latter requires initially using the one per rev reference mark to set a reference.
If direction of motion is not important, it can also be done with a single output-multi pulse encoder with ref mark.
If using a stepper motor, the encoder can be dispensed with and just a reference point initially used and from there the motor is stepped in 1.8° step resolution.
Max.

 

For DC/BLDC motors, this is typically done with a rotary encoder, two types are digital and quadrature, the latter requires initially using the one per rev reference mark to set a reference.
If direction of motion is not important, it can also be done with a single output-multi pulse encoder with ref mark.
If using a stepper motor, the encoder can be dispensed with and just a reference point initially used and from there the motor is stepped in 1.8° step resolution.
Max.

Thank you! I'm wondering where I can find these components to put them in EAGLE or are they already existing in the programe? If not, where do I find them?

 

You might find a library part via a google search. But, I have found more complete crap library parts out there than good ones. Verify any part you find. A common problem is incorrect hole size, closely following by bad smd pad spacing. Don't trust, just verify.

But, it's probably unlikely you will find a part so you should make your own. It's actually fairly easy to do. There are tutorials (google for eagle library tutorial). It's a 3 step process - design symbol, design package footprint, create device- connect symbol & package. I've been doing it for a while so I'm pretty fast but once you understand I expect you'd be reasonably quick. It takes me 10-15 minutes to create a simple 3-4 pin part. A 40-60 pin part might take a half hour. The largest amount of time is verifying that the right pins are connected to the right pads.

Edit: by the way, be skeptical of data sheets, too. Get the physical part and "paper test" it before ordering a PCB. Print out the board on paper and see if it fits. I've been burned several times.

 

A cheap version of the quadrature encoder that has a marker is the CUI AMT10 version at Digikey etc.
If you want the output of the encoder, Google quadrature encoder.
Max.

 

You might find a library part via a google search. But, I have found more complete crap library parts out there than good ones. Verify any part you find. A common problem is incorrect hole size, closely following by bad smd pad spacing. Don't trust, just verify.

But, it's probably unlikely you will find a part so you should make your own. It's actually fairly easy to do. There are tutorials (google for eagle library tutorial). It's a 3 step process - design symbol, design package footprint, create device- connect symbol & package. I've been doing it for a while so I'm pretty fast but once you understand I expect you'd be reasonably quick. It takes me 10-15 minutes to create a simple 3-4 pin part. A 40-60 pin part might take a half hour. The largest amount of time is verifying that the right pins are connected to the right pads.

Edit: by the way, be skeptical of data sheets, too. Get the physical part and "paper test" it before ordering a PCB. Print out the board on paper and see if it fits. I've been burned several times.

Thank you! As I mentioned I'm very new to Eagle and don't really understand much of it. The only information I've been given is to design a scheme for a position sensor in a motor. How do I know how a position sensor looks like, if I were do design one?

 

A cheap version of the quadrature encoder that has a marker is the CUI AMT10 version at Digikey etc.
If you want the output of the encoder, Google quadrature encoder.
Max.

Thanks! I found it but how do i download it to Eagle?

 

No problem, do this.

 

I assumed you had to integrate it as it is an external component to any Eagle scheme which is primarily a PCB/schematic capture program.
To actually make one you need a three opto sensors, this is a crude one out there in schematic format, if you Google it the principle will come up in several places.
Max.

 

AAC has a short explanation of a quadrature encoder, top of this page click EDUCATION
- Vol. IV ,- Ch. 11, sequential circuits,- last entry. It lacks an index mark which would reset the D FF.

 

Don't trust, just verify.

That's true of parts in the included libraries too! I made a really embarrassing mistake in the only circuit board I ever produced with Eagle. I used its built in smt pads for what should've been standard, predictable, well known parts, but they were rotated and spaced wrong. Trust nothing.