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Great slides. Thank Sir Randy.

Iron

once again, goodnight and good morning sir randy...almost done, that's why the other day 4 & day 5 will be tackled tomorrow evening...

much appreciated of another excellent presentation of sir randy...thanks and to the digikey and design news to make this continuing education happen...

this is a great opportunity for us professional wants to earn PDH Certificate for continuing education in the field of engineering profession...

great presentation sir randy...now, almost finishing with the slides of day 3 class lesson...i am in slide 25 now...

where is the second number 9 rating in slide 17? what does instance for? like IP69?

i am now in slide 12 of day 3 class presentation...still some are new to me and some are quite familiar...

i am now downloading for the presentation slides then going through slides while sir randy is discussing...

good morning sir randy! it's already morning here, hahahaha...this is my last session afterwards, i am gonna sleep...

Thank you Randy and Alex, great presentation very informative.

Iron

Thank you Randy & Alex for informative seminar.

Iron

Thank you! Great information!

Haha, thanks Steve!  Yeah, I had to raise and then immediately lower the volume several times througout, but still educational and enjoyable.  Thanks Randy and Alex for another great presentation.  

Iron

Keep in mind, flush-mounting will reduce a capacitive sensors range somewhat.  So, if you are having trouble with this, or would just like more range and you are not forced to flush-mount them, leave it sticking out a bit.  

Iron

We have just started to use capacitive proximity sensors.  They are very impressive devices, so far as their capabilities go.  

Iron

I figured that the high-pressure, steam cleaning process was for food; I never thought about it as a reflection of the vehicle industry.

Iron

Has anyone else been having trouble with Randy's voice getting very low, or is it just me?

Iron

Very interesting. Thanks again Randy.

Iron

Good lecture, enjoyed it.

Iron

I'm interested in a range of Gray Code encoders/decoders.

Gold

A good benefit to the course attendees and a chance to advertise for the publishers would be to:

* post some related sample products from Digi-Key and

* some related articles from Design News (and EE Times?).

Good book for Sensors?

Iron

Another good session, Randy.  Thanks!

Iron

I missed this session live. Great to have access to the archived material. Thanks!

Iron

Some of the information is for someone that knows  alot about sensors.  reading up on some of the websites should help.

Iron

Some good information in todays lecture.

Iron

there is a link at the top of the page to the other sessions under archived sessions.

Iron

i really missed alot

 

Iron

It would be great if someone would add links to all the presentations in the individual series at the top of the sessions.  So this sesion would have links to the first 2 presentations before it.

Iron

Up to a max of 5 points per presentation.

Iron

You also get a point for every post.

Iron

You get credit for simply starting it.

 

Iron

I was interrupted during the original presentation. I just went back and replayed the presentation on this page without accessing the archive. will I get credit for attending this presentation?

Iron

Analog Devices has ICs to interface LVDTs

Iron

luizcosta - Here's a start for your answer:

http://wiki.ask.com/Rotary_encoder

Iron

Zwilrich - Thanks.  I suppose I need to read up on this.  I'm not familiar with the specific aspect of encoders.

Iron

What is meant by "counts after quadrature?

Iron

Randy, I am leaning towards LS7366 part.

Iron

Alaskaman66 check HD20-25 series

Iron

Thanks everyone for participating. See you tomorrow.

Blogger

What are the approval agencies for IP cetifications ? and aprox cost ?

 

 

Randy, any suggestions for a quadrature decoder IC with SPI out? I have an older uP that doesn't support quad IP.

These guys offfer a starting poin tot ocnider:

http://www.ichaus.de/news/122

Blogger

Farebrog: Thanks, woll check out Dynapar. Maybe sensors  also meet Facory Mutual approval??

Thanks. Hiding in plain sight, are they now...

Iron

Randy: do you have any pointers for linear encoders? I can find rotary encoders galore, but somehow linear encoders seem to be hiding from me.

Yuo may want to check out LVDTs. Linear variable differntail transformer as a possible technique.

Blogger

Any ideas on using magneto resistive units for positioning?

 

Gold

OOPS Lost the thread. How do I get back to real time?

Aren't optical elements sealed?

In many cases but to be sure it meets your needs, you need to have the supplier tell you what IP level they guarantee.

 

Blogger

I'm off now, enjoyed the chat and session. See everyone tomorrow.

Iron

All thanks for the input. Anyone experience optical encoder problems due to a dusty atmosphere? How about a high humidity condensing atmosphere?

For slide 21 that showed the Sr values, the other values were defined on slide 20

       Assured operating sensing distance (Sa) 0 ≤ Sa ≤ 0.81 x Sn

       Usable operating distance (Su) 0.9 x Sr ≤ Su ≤ 1.1 x Sr

 

 

Blogger

Cool, thanks Randy, looking forward tomorrow for the fun stuff.

Very useful and interesting lecture.

Iron

Randy: do you have any pointers for linear encoders? I can find rotary encoders galore, but somehow linear encoders seem to be hiding from me.

Iron

IRON

I'm not sure how that rotary position sensor works. is it capacitive? i thought they were implementing these sensors with semiconductor based generators and silicon based optical encoders.

Iron

I googled that too and could not find an answer, before and after quadrature.

Danlafleur: Thanks. Last ckt I made used SS relays from Mouser that switched 120 VAC with a 6 ma DC trigger. Much better than having to build a relay chain to get to the output requirement. I will need something in the future for an automotive application that can directly control glow plugs. So the output would be hundreds of amps DC at 10-13 V.

whats the meaning of before and after quadrature

before is simply pulses but after takes into account the calcualtions to determine direction

Blogger

Good show, slide 26 is too difficult to read, too squaty and flattened.

Many slides are "double exposed" near the Design News lower left screen area.

Thanks for everything as I an finally aboard ant trying to catch up and keep up if possible.

Iron

does anybody have experience with a distance sensor (ultrasound) like SPM0404UD5?

Iron

Does anyone know where to get an evaluation encorder motor kit?

Iron

$900 a part price. it make me to recall my first math coprocessor's price 23years ago.

Iron

Photo of Alex?  People have asked for my photo also.  I was flattered till I found they wanted it to discourage vermin infestations!

 

Gold

You can buy a L3G4200D MEMS gyroscope for less than $30 retail if you don't need a part that is designed for extreme conditions - Cost is relative depending on the application and cost of downtime :-)

Iron

I would only use that gyroscope in a USD $100.000+ project.

Randy, any suggestions for a quadrature decoder IC with SPI out? I have an older uP that doesn't support quad IP.

Iron

Thanks Randy for a great lecture and many thanks to Alex for taking care of the logistics

Iron

@luizcosta... somethng similar to this http://e2e.ti.com/group/msp430launchpad/b/boosterpacks/archive/2011/04/17/430boost_2d00_sense1.aspx

 

Iron

Thanks Randy, Alex and all. See you tomorrow.

Iron

Thanks - Great session

Iron

Moderators have be like that in order to keep things flowing.

I guess I figure $900 for an IC is a bit much. It all depends on your application and how valuable the part is.

Iron

Randy, thanks for your presentation today

Iron

Thanks Randy

Very interesting stuff

Thanks Randy.  Great session and am looking forward to tomorrow.

 

remember LN33??? FrankBishop?

Iron

thanks, it's a great lecture.

Iron

I agree. Not hard to figure out the slide. Or you can ask in chat if you get lost.

Iron

At least they are not as big or expensive as the gyros I remember from my days in the navy circa 1980's

whats the meaning of before and after quadrature??

Iron

It's not just the volume level--- the interruptions interrupt the presentor, distracting them and throwing off their presentation.  I can figure out what slide he's on.

Does anyone know for sure what Apple uses for the rotary polistion sensor?

Iron

$900 seems like a lot of money, until that's what you need to solve a problem. I remember inertial navigation units in a sealed platform with real gyros, acellerometers ans lots of precision mechanical parts.

Iron

Alexander Wolfe - Actually, Steve is correct.  But the volume level has been that way since the first webinar many weeks ago.

BTW, have you given anymore thought to that photo posting of yourself that I mentioned yesterday?  We'd all like to see to whom we're listening.

Iron

That's another parameter to consider - the time you have to develop a system.

Iron

Thank you for the presentation

Iron

And they will get smaller faster and more accurate

thanks Randy, another informative session, learned a lot today. thanks ALex.

Iron

Great presentation.. Lot of new topics to explore...

Iron

10 Years and the price will come down

Thank you Randy, another excellent presentation.

 

Iron


Thanks Zwilrich

IRON

 

My confusion may come from looking at the time diagram, where a pulse that is initially 90 degres ahead of the reference pulse, may miss the clock and the pulse that is 270 degres may be taken as behind the reference pulse.

I

 

Iron

WOW, ADIS16136 is a $900 part

Iron

On pp #13 sine and cosine both have the same values...

Resolvers have quadrature outputs.  You also need to look at the colors.  For a resolver position of 0, the sine output is zero and the cosine output is full scale.  At 45 degrees, they are equal at 0.707* full scale.

Iron

that gyroscope is expensive

SORRY @STEVE I'll talk more quietly!

Blogger

looks like 35mm by 44mm by 14mm

On pp #13 sine and cosine both have the same values. I thought cosine started at 1. what is the difference in this graph?

Slide #13 lists sine and cosine, which bothseem to have the same vlues. I thought cosine started at a value of 1, sine at 0. Could you explain.

 

Iron

Is the gyro sensor single axis?

I used to work in a sandpaper factory. The metalic dust got in erery thing and scratched up all the infrared bar code stripes I worked with something fierce

I have no idea how these sensors are manufactured, they seem complex to fabricate. Can you elaborate a bit on this? Thanks.

And Sa, Sn and Su rating???

Iron

What's an Sr rating?

Iron

My Caps Lock was not on during my last post.

Iron

Looks like all these are included

Solid particle protection

Liquid ingress protection

Mechanical impact resistance

Aren't the phases measured separately as process outputs?

The two sensors look at the same encoding disk.  They are set during manufacture so that the phase is approximately 90 degrees apart (electrically).  Mechanically, they can be anywhere around the circumference of the disk.  They just need to be spaced so that when one sensor transisitions, the other sensor is in the middle of bar.

Iron

Alaskaman, good question, we also design for C1D1/2 and -40C, any encoders available?

Iron

Alaskaman66, check Dynapar site for IS encoders and resolvers. Used lots in the oil and gas field.

Iron

Ingress protection = Dust protection?

Resolvers and encoders available for NEC class 1 Div 1 applications?

Zwilrich - Thanks.  I suppose I need to read up on this.  I'm not familiar with the specific aspect of encoders.

Iron

@Randy.  So how does resolver differ from encoder exactly if we can have digital output via extra interface??

Iron

Sorry my capital gets locked from time to time

 

Iron

sounds like absolute encoder does not rotate freely, but stop-to-stop.

Iron

IRON

Aren't the phases measured separately as process outputs?

Iron

@luizcosta. There is no point of losing phase in this scenario. phase is inherent for the placement of sensors...

Iron

What is meant by "counts after quadrature?

By looking at the phases between the two channels, you effectively can multiply resolution by 4.

Iron

Ran, a quadrature signal has 4 edges per count

Iron

randy, your volume is low. please talk louder or closer to the mike. thanks

absolute encoder - just a potentiometer with ADC?

Iron

what happens when phase A and Phase B measurements loose sync?

They can't.  The phase relationship is fixed by the detector positions.  Only mechanical changes cause phase changes.

Iron

What is meant by "counts after quadrature?

Iron

Alex, could you use a softer voice when you chime in?  My volume is at mx so I can hear Randy. When you join in my pods are blown off and then I can't hear Randy because my ears are filled with blood.  Thanks

Iron

Randy, in the QUADRATURE encoders, what happens when phase A and Phase B measurements loose sync? Is that fixable within the context of the software?

Iron

Reyaz and farebrog> right, thx

Iron

@alaskaman66, as danlafleur mentioned, if the optical disk gets contaminated, then it would certainly affect the output and yes, the emitter/detector components are sealed.

Iron

Grey code and binary are available.  I don't know about BCD.

Iron

ipod has a capacitive sensor not a rotary encoder (@luizcosta)

Iron

Alaskaman66, we use an optical emitter/detector pair with a slot where an optical disk inturrupts the beam.

Iron

Randy,

Are encoders still available using different coding schemes such as BCD, Binary, etc.?  Are "Gray codes" still used where only one bit changes from one position to the next?

Iron

Randy/Alex: Any silicon based rotaional encoders being made? Wht is in the iPoda, iPhones, iPads as positional encoders?

Iron

http://en.wikipedia.org/wiki/Resolver_%28electrical%29

A resolver is a type of rotary electrical transformer used for measuring degrees of rotation.

An optical encoder is a disk with holes or opaque bars on it.

Iron

Aren't optical elements sealed?

For a mobile application, is there any effect of earth magnetic field on magnetic encoder?

Iron

I do recommend to interface the relay with an optocoupler or an open collector array (ULN2803)

Iron

please define what a resolver is vs an encoder in this case

Iron

hmmm, CANopen motion buses, interesting...

Iron

Audio is loud and clear

Iron

@timmer116 It's "Blog Talk Radio" (Design New's audio ISP)

Iron

@timmer116, yes i believe so, but it is not so clear :)

Iron

i've driven led input ss relays directly for a PIC pin with current limiting resistor.

Iron

Hi Randy. Ready for today's session...

Iron

Alaskaman66: igbts have a gate input as opposed to the base of a transistor.  As long as the port pin can supply the required charge fast enough to switch at the rate you want it shouldwork.

 

Iron

@Alaskaman66, microchip PIC is cable of source/sink 25mA at 5V, will that do?

Iron

:

I think they, IGBT's input are FET, pulling very small curent.

Iron

What does that woman say when the sound starts? Block Talk Radio?

Iron

Good to be here, everyone!

Iron

good afternoon - looking forward to an interesting session

Iron

Are there MCU's capable of driving IGBTS or solid state relays directly for power applications?

Good Morning from Valdez

 

Can anyone recommend a single chip quadrature decoder, ideally with SPI interface?

Iron

hello randy. choose sensors was very informative. which applications to apply them to is sure to be benficial too. looking fordward to this lecture.

Good afternoon Randy. Thank you for the informative info on how to choose sensors.

Iron

Good morning Randy, Alex and all.

Iron

If you get a chance, please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY

Blogger

Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

If you need a PPTX viewer, go here: http://www.microsoft.com/download/en/details.aspx?id=13

Blogger

The streaming audio player will appear on this web page when the show starts at 2pm eastern today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser.

Blogger

There are usually a bunch of comments by now.

 

Iron

you're an hour early :-)

Iron

No comments yet? Strange.

Iron


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