Re: New Speed Controller Announced
 

Q - I was a hardcore microchip fan, as I used them nearly exclusively through college. After playing with a few Luminaries, I am converted. My microcontroller heart is split between Luminary and Cypress.


http://www.luminarymicro.com/product...tor_guide.html
They list SOIC-28 LQFP-48/64/100 BGA-108. LQFP is about as small as I can solder by hand.

Re: New Speed Controller Announced
 

Thanks Eric.

Still not sure I'll be an instant convert or whatever, but I am interested in playing with some of these micros.

-q

Re: New Speed Controller Announced
 

Will this discount be season-long or will it end soon? Important to know for teams who want to purchase some!

Re: New Speed Controller Announced
 

Any chance you can supply a complete solid model of the housing? The iges file imports as a shell which can be troublesome to work with.

Is Luminary aware that it is common for teams to purchase many of these during a season? Teams that construct 2 complete robots may purchase 10-15 of these in a single season!

If these are purchased for non-FIRST applications will their full potential be available?

Thanks.

Re: New Speed Controller Announced
 

According to the Getting Started guide, it is recommended to have 1/2" of empty space on the left and right side of each Jaguar speed controller. If you were to mount two Jaguars with their sides adjacent to each other, can this 1/2" space overlap, or would you need a total of 1" of space in between the two?

Re: New Speed Controller Announced
 

One thing teams will have to be aware of is that according to the manual, if there is an over current or temperature condition, the motor controller will shut down. The PWM input will have to go to neutral for the motor controller to go active again. For 2009 we will not have any feed back from the motor controller to know that it is in shut down. Teams will have to decide how to detect and reset the motor controller. For the drive this will probably be the responsibility of the driver. For arms and other uses a controller reset button may be useful. Going forward in 2010 with the CAN control method this condition can be handled in software and the user can be alerted that a shut down occurred. Also with proper monitoring code, the controller could implement strategies to stop the controller from going into hard shut down. First team are used to using total open loop controllers and have only been protected from faults by the circuit breakers. How to deal with intelligent controllers is something teams will have to work on in the future. This year without 2 way communication with the motor controller, the victors may be a better choice for uses other than drive motors.

Re: New Speed Controller Announced
 

...provided teams are willing to pay ~40$ more and put up with a highly non-linear drive characteristic in favor of footprint and a lack of a latching over-current protection.

IMHO, the only advantage the victor has is size. The cost advantage and the linearity advantage leads me to believe that the Jaguar will see a lot of play this year.

Re: New Speed Controller Announced
 

Any extra motor controllers we buy will be Jaguars. It is a cheaper component and is more future proof for this competition. Seems like a no brainer to me.

Re: New Speed Controller Announced
 

Luminary Micro is a fabless semiconductor company, so we contract the fab to a foundry. We license the ARM Cortex-M3 core and integrate it into our SoC devices, like the LM3S2616 which is at the heart of the Jaguar motor controller.

The QFN package is not part of the portfolio at the moment.

Re: New Speed Controller Announced
 

I'll have to check on whether this is still true. It was the case for the firmware for the Rev0 versions, but after discussions with FIRST I thought the decision was made to change this so that it would start back up again after the fault period. I will check on this and update the documentation if in error.

Thanks for pointing this out.

UPDATE: Not true anymore. The manual is out of date and is being updated. The PWM input does not have to return to neutral before the motor controller goes active again. This was the behaviour of the original prototype, but was soon changed.

Re: New Speed Controller Announced
 

There's only a cost advantage if you're comparing buying new Victors to buying new Jaguars... most teams have plenty of Victors already from prior seasons. Free is a lot cheaper than $75...

Re: New Speed Controller Announced
 

Wait... so your telling me that for this season, a victor's only advantage is size? The fact that a an overcurrent on a jaguar causes it to shutdown until a neutral signal is given scares me. Do you know how hectic it is for a driver in a match? How is he immediately supposed to diagnose an overcurrented controller and stop? The alternative being building some some sort of electronic monitering also doesn't appeal to me. Even if could be entirely done in code, the fact we have to send a nuetral signal upsets me.

With the victors, I've never seen one overcurrent in recent times. Heck, I've never had a 40 amp breaker pop during a match on any team I've been on in recent times.

You just made my team's decision for us. I had even got over my dislike of the new system, I had no unfair bias against it. Even if the jaguar doesn't overcurrent often, we'll be using victors. I feel IFI deserves it (2 robots with 6-10 motor controllers each is a lot of business for IFI, we don't have many spares), as for some reason it became cool for some at FIRST to hate them and make snide remarks whenever possible. I love IFI for what they did, and I hope oneday I'll learn to love NI, Luminary Micro, and the other companies for their new system (that love has to be earned with proven reliability and results, so I'm not bashing the new system).

We were seriously considering using all Jaguars for the "better performance".... but IFI is good people.

Re: New Speed Controller Announced
 

The specifications table states that the Fan On temperature is 42 degrees Celcius and the Fan Off temperature is 38 degrees Celcius

The last Q&A question states:
So my question is, does the fan come on when you start running a motor, or when the temperature hits 42 degrees, or both?

Re: New Speed Controller Announced
 

Hi q,

>>Do you guys manufacture/fab your own parts or do you guys do the design and somebody else does the fab?

[Emley] We use an external foundry, which provides economical and technical advantages for us. (For instance, we take advantage of automotive-grade Flash memory)

>>I'm a hardcore microchip lover so I don't think I'll ever stop (in the forseeable future) using them, but for high performance motion control applications, your products are very interesting... especially the ability to get parts that are both communications powerful and still incorporate a good assortment of motion control components.

[Emley] I hear from lots of folks that were just like you - that then got experience with ARM Cortex-M3, and then never looked back. But, out of genuine respect of all the great things that Microchip has done for the FIRST community over the past years, I will try not use my posts to explicity (or purposely) evangelize you. If you catch me "being a marketer", hold me accountable. ;)

>>I don't want to get this thread too off topic, so I'll make my last question short... do your parts come in a QFN or other itty bitty surface mount package?

[Emley] We currently offer Stellaris ARM Cortex-M3 microcontroller solutions in 28-SOIC, 48-LQFP, 64-LQFP, 100-LQFP, and 108-BGA. Our beat-rate of products is unprecedented, so if you don't see what you need, don't forget to look back every few months.

Regards,
Scott

Re: New Speed Controller Announced
 

Great question: The FRC discount is not a promotion, but rather a season-long way for us to contribute to your success as an FRC teammate or mentor.

The FRC discount is planned to last (at least) throughout the FRC2009 competition season - so don't panic.

Regards,
Scott