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Thank you Ann & Paul

Iron

Most Excellent presentation

Thanks

Iron

Agree on the AARL Manual ... great resource

thought the on-board antenna on slide 18 would have cornered traces (vs right angle) ... have seen this approach on garage door openers for example (with tuner/attenuators) of course these are in the 300-400MHz range tho ...

Distance measurements ?? .. add GPS and calculate the differences??

Glad  you at least mentioned software, a slide or two at the end of the presentation would be useful

Thanks Paul

A good week of lectures

Yes I am interested in distance measurements

I have no preferred vendor

hello from albany new york

picking up this last lecture

I carefully reviewed this lecture again. Thank you Paul, you did a great job!

Iron

Thanks Paul for sharing knowledge; very informative week session

Iron

Thanks for archiving this....wish I could have attended the real lecture.  I was wondering if the FCC has set a date that the ISM radios need to go to narrow band,

Iron

Thanks Paul and Ann, Great Week!

Iron

Thank you. The historical pictures were a nice touch.

Iron

Thank Paul for great and informative sessions. I have learned a lot of new stuff. Best Regards!

So long everyone.  I am going to sign off now.

I hope that our class has been helpful to you.

All the best till next year.

Paul.

 

Blogger

Right.  I was not promoting MiWi.  Have not used it.  Just clarifying because the question was asked how MiWi compared to ISM.

Iron

thank you for agood info

Iron

@JayPaxman

I believe that TI does have the artwork in app notes on their site.

MiWi:  Maybe good, all vendors say great things about their stuff

I would not discount other choices too.

Blogger

Does TI have the artwork for that figure 18 Dipole in an AppNote?

Iron

And MiWi is for ISM:  "The MiWi DE is ideal for the development of ISM-band wireless networking applications for the home and industrial automation, wireless sensor monitoring and control, and smart energy markets."

Iron

Thanks Paul for the suggestions and this week's lectures. All the best to you!

Iron

@JDBC

Yes, you are on the right track.  To do a PCB antenna,

find an example that you like, make sure that the example

is completely un-ambiguous.... and copy it EXACTLY, then have

two people check that you actually copied it EXACTLY and take

nothing for granted.... You may then succeed.

Blogger

@JayPaxman

Thank you for clarifying.  I did not realize that

MIWI is a Microchip brand.  Each vendor supports

its own small-network protocol code.  I can't say

if MIWI is any better or worse than say SimpliciTI

from TI..... There are a few choices out there, select

one that is best for you... or write your own.

Blogger

Thanks for the information.

 

Iron

@pauln That's not our preference. We found that a wire connected to an SMA has the best performance. Unfortunately, the FCC says that the antenna needs to be attached in a way that others cannot easily adjust it so PCB is ideal for our application. The PCB antenna is tricky though because it's not very affordable to design, have a third party build, and then test multiple PCB layouts.

Iron

MiWi™ Development Environment is Microchip's proprietary wireless solution

Iron

@pauln How does MiWi contrast with ISM for sensor net applications?

Iron

MIWI:  Hmmm don't know.  Not used it here yet.

Can anyone else comment?

Blogger

@JDBC

Do you have time to test them using a 3rd party lab?

If you have time... it could be worth it.

Blogger

sorry, meant to say in multiple devices. Polarization is an issue as the recievers are at multiple heights and distances.

Iron

@JDBC: Thank you for PCB antenna design ref/docs

802.15.4-2003 is availabe as free PDF at IEEE web site

 

WRT: FCC Certification - I don't really think that one chip is

better than the other.... BUT ....  one type of modulation style

will certainly be better than another.  802.15.4 with it DSS style

chips WILL PASS.....  If you stray from that standard, beware...

Your spectrum use could be out of FCC standard. 

Blogger

@pauln The desire is to use same PCB antenna is multiple devices with GFSK modulation so I don't think detuning will much of an issue with the deviation we have.

Iron

@JDBC

Antenna choice between say meandering or

inverted F really depends on the application

- that is what enclosure are you putting it in

and what radiation pattern do you expect.  Also

do you care about polarization and do you care

about the tendancy of the antenna to stay in or out of

tune.

Blogger

i have not used ieee 802 recently.  been into mjcrocomputers.

 Thank you very much Paul.  Great presentations!

Iron

Thanks Paul, that was a great course. I'm looking forward to your next one.

 

Iron

Co-site interference immunity, for that we

start to have to look at SAW filters.  I said nothing

about SAW filters all week......

Blogger

How does MiWi contrast with ISM for sensor net applications?

Iron

That is right about ranging without hardware support,

its not really possible.  We did alot of synchronization

work - that is doing a sync of multiple receivers using

a single beacon.  It's very very tricky, and one sees time

slips of 100's of microseconds all the time.

Blogger

SWRA227D or DN024 with TI has been a good reference for PCB antenna design. 

Iron

As  far as I know there is NO TIME OF FLIGHT

on TI parts -- yet.   And its not really possible to do

if its not supported in hardware.

Blogger

excellent session, and excellent week. Thanks Paul

Iron

Yes, we have looked at Analog Devices,  their

parts are quite good too, just didn't make it into the presentation this week.

Blogger

Is there resource on how to design PCB  anttena  like the one shown in the slide?

Iron

Thanks Paul and Ann, an interesting week. I know more about ISM radio than on Monday. I enjoyed the week.

Iron

 

the chip with the dipole is one of TI's CC radios,

maybe a CC2420

Blogger

WRT FCC certification, is one chip better then the other? Is it better to have radio code in ROM? Should chip be in metal can?

 

Iron

Where can we get a copy of 802.15.4 2003

Iron

Excellent presentation, Thx

Iron

Thanks Paul, I really enjoyed the course.

Iron

Great week and lots of good info. Thank you

Thank you. It was great seminar.

Iron

@Paul: thanks so much for sharing your insights and your passion for the history of our craft with the pictures and lessons each day. Great presentations!

Iron

Can you comment on some of the non-obvious tradeoffs of deploying a module vs a discrete design?

Iron

Thank You Ann and Paul!!

Iron

Love the old pictures

Gold

This course was great, thank you

Iron

What fundamental recommendations for PCB antenna design? Reference documents, calculations pros and cons.

Thanks Paul for the week of excellent information!

Iron

thank you Ann and thank you Digi-key for sponsoring

Iron

Thank you.  This has been very informative.

Iron

Thanks and have a good weekend

Iron

Awesome, very informative for me, great reference material, Thank you Paul

Iron

What is the chip with the Dipole PCB antenna in slide 18?

Iron

SMA We can then locate the antenna away from the sensor/radio

Iron

Fixed dipole or directional dual 1/4 wave

Iron

Today's next audience question is

What types of antennas have you used or are you considering using in your designs?

Blogger

We are currently working on designing/testing a PCB antenna in the 915MHz range.  Has anyone had experience with PCB antenna design and, if you have, do you prefer meandering or inverted F? Also, any references to help with design would be much appreciated!

Iron

We have been using our own PCB antennas to meet space limitations

Iron

Planning to use a PCB antennas

@Ann - chip and PCB

Iron

Have you looked at the Analog Devices ISM band Transceivers?

 

Iron

Any Time Of Flight on TI parts?

Iron

I agreee that using signal strength for ranging is pretty much hopeless.

Raning using time-of-flight measurements is a facinating topic.  Someday, I will need to read the 802.15.4-2011 spec to see how the spec does it.

By the way, the academic wireless sensor network research community did a bunch of work on ranging without hardware support.  I don't thing that any of the results were particularly good...

Iron

Do any of these receivers have data on cosite interference immunity if used near other emmiters?

Iron

not very important

 

Iron

Knowing distance from  trmtr to rcvr would be good know.

Iron

Yes, interested but complex to implement.

Iron

No distance measurement requirement but it is a very insteresting concept

Iron

yes on the distance application

Iron

Yes distance is important

Iron

@Ann - not interested in distance measurements

Iron

Today's next audience question is

Is anyone listening interested in making distance measurements using ISM radio?

Blogger

I gree we have used both SPI and I2C and have nothing but trouble with the latter.

Iron

hello from sunny miami.

we use both ti and freescale

Iron

We're using modules from Synapse Wireless.

Iron

@Ann - Freescale and TI

Iron

We are using the XBEE-PRO modules

Iron

Texas Instruments is King

Iron

No. I have not implemented anything yet.

Iron

Does anyone listening have a preferred 802.15.4 transceiver device or device vendor?

Blogger

@Ann: no preferred vendor.

Iron

He was a Jeopardy question last night. I was able to guess it right after participating yesterday.

Iron

If you're having audio issues, please note that some companies block live audio streams. If you don't hear any audio, try refreshing your browser. The show will be archived and available on this page.

Blogger

Had to refresh the page for audio (the player was not showing up)

Iron

Hello from Hemet, CA

Iron

Hello from Corona Ca

Iron

Hi, teklava, I lived in Hawaii for 22 years -- worked at Xerox.

Gold

hello and happy Friday all from Edmonton, Alberta

Iron

Hello all, I got the deck downloaded here in Cedar Park TX...

Iron

Casual here all the time in Hawaii

Iron

i wiish it was casual, i am working :(

Iron

Happy Casual Friday!

Iron

Hello from Alabama. Great week of information sharing.  Have a great weekend.

Iron

Hello all.  Happy Friday!

Iron

Good morning from Milwaukee!

Iron

Good afternoon, everyone

Iron

Good morning, everyone.

Iron

Good Morning from UT

Iron

Good afternoon from MA.

Iron

Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY 

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

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

Blogger

Good morning from Scottsdale, AZ

Iron

Good Morning from Sunny San Jose, CA.

It's 48°F and a High of 64°F.

TGIF!!!!

Iron

TGIF on Pearl Harbor Day in cloudy Boston.

Iron

Good morning from southern California

Iron

Good morning from Edmonton, AB.

Iron

Good morning from Nebraska!

Iron

This week session is very informative

Thanks Paul and Ann

Iron

Yo Paul & Co. The slides could use some numbers.

Iron


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