HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Blog
Teardown: Fitbit Zip Packs Lots of Functionality Into Small, Water-Tight Package
1/4/2013

Return to Article

View Comments: Newest First|Oldest First|Threaded View
Page 1/2  >  >>
gregoski
User Rank
Iron
Re: The teardown and the commentary
gregoski   8/21/2014 11:00:20 AM
NO RATINGS
Hi Rich,


This teardown was extremely helpful to me.  I am conducting a reliability study with 20 Fitbit Zips using a mechanical step machine.  I have two questions.  The first is whether I can have permission to use the internal picture you posted (I would provide the reference back to this teardown and credit you).  The second is whether you would be willing to identify the exact location of the mems accelerometer on the board.  You mentioned it is a 3mm x 3mm part that can easily be mistaken for one of the passives.

For the article I am showing the teardown of an actigraph 7140 that used a piezo-electric type accelerometer and I want to show the insides of the zip along with a MIT schematic of the Capacitance Acceleromer. 

I look forward to your correspondence.

~Mat

BlueHorse
User Rank
Iron
Some question about the fitbit dongle
BlueHorse   6/6/2013 9:56:11 AM
NO RATINGS
Hello,

 

It's a really nice article, love it. It helped me to know more about the device.

I also have a fit bit and it works great, However there are some things i dont understand.

As it usages a NRF8001 and it is a Bluetooth Low Energy, So how is it able to sync with Dongle as well as the smart phone's? Is it the Dongle which helping to do this? Is the dongle Dual mode, so that it can talk with Classic Bluetooth as well as Low Power?

Also when i plug in the dongle in my laptop i dont see it as a normal bluetooth device it appears as a human interface device in device manager. Isn't the dongle a bluetooth device? If yes why doesn't it show up as a bluetooth device?

I am really curious about it and looking forward to hear from someone.

 

Thanks in advance :)

 

InterestedinRF
User Rank
Iron
Re: Software, software
InterestedinRF   4/11/2013 8:17:24 PM
NO RATINGS
Hi Rich, nice article, well written and informative. There is one technical error that's worth correcting though. The article states "With peak currents as low as 12.5 mA and average currents down to 9 mA (for a 1-second connection interval), the nRF8001 enables a battery life ranging from months to years from a single coin cell". While the figure for the peak current is correct, the average current should read 12 microamps (from the Nordic Semiconductor website which actually states "average currents as low as sub 12 microamps (for 1s connection intervals)"). Otherwise the battery life from a typical CR232 coin cell would be tens of hours rather than months.

bobjengr
User Rank
Platinum
FITBIT ZIP
bobjengr   1/20/2013 12:57:26 PM
NO RATINGS
Yes, excellent article. Really enjoyed the write-up. Rich, do you have any "feel" for the accuracy of the device?   I logged in to the Fitbit web site and definitely feel my wife and I should by at least one to share.  We both exercise 3, 4, 5 times a week and this would be a great addition and allow tracking and calories burned.  At $59.95 each, it's a great deal.  Also, any difficulties with "syncing" with an i-phone or Android device?  Again, many thanks for the information. 

richnass
User Rank
Blogger
Re: The teardown and the commentary
richnass   1/8/2013 7:53:32 AM
NO RATINGS
Thanks for the comments. I appreciate that you can appreciate that it takes a lot more time to write the Tear Down article with insight form the actual design team. In my opinion, that makes it significantly more valuable. Anybody can take somethng apart and identify the components.

 

As to the hammer vs. a screwdriver or some other tool, that's generally a time saver. I will admit (but don't tell anyone) that I have used a screwdriver in the past. But sometimes these devices are so hard to get apart that frustration (and deadlines) set in, and the hammer becomes very appealing.

 

Rich

William K.
User Rank
Platinum
The teardown and the commentary
William K.   1/7/2013 8:59:48 PM
NO RATINGS
I certainly did enjoy the analysis and discussion that included the comments from the design group. And the thinking that goes into a small package is always educational.

But using a hammer is rather brutal. I routinely take apart devices that are not intended to be opened and serviced, and I am able to repair a good portion of them. If they have a welded seam in the plastic housing that is the first point of attack. A sharp "gerber" brand knife blade is often able to open a package in a manner that allows it to be re-sealed when the repairs are done. So while it does take a lot more effort, opening devices in a re-closeable manner has a lot going for it. Of course, it is a liitle bit like those diamond cutters that we see pictures of. That is, it does take a lot of practice and a good deal of examination.

herbissimus
User Rank
Silver
fitbit teardown
herbissimus   1/7/2013 5:33:02 PM
NO RATINGS
i'm one of those too who can hardly resist seeing the insides of products. but being ever hopeful about retaining the devices functionality, the hammer is verboten. why not use a dremel tool with a saw or grinder attachment or a hacksaw so your exploratory surgery isn't invariably fatal to your subject device?

Charles Murray
User Rank
Blogger
Re: Better than a Teardown
Charles Murray   1/4/2013 5:23:12 PM
NO RATINGS
I, too, like the way this teardown was written. The more I delved into it, the more I realized how many hours must have gone into the product development. Ninety percent of the code had to be rewritten? The team had limited familiarity with the ARM architecture? Sometimes, we see these teardowns and don't realize how much went into the creation of the product. This serves as a reminder of how complex the design of these seemingly simple products can be.

Ann R. Thryft
User Rank
Blogger
Re: Better than a Teardown
Ann R. Thryft   1/4/2013 2:49:43 PM
NO RATINGS
I agree with tekochip--kudos to Rich. It's enlightening to get input on the design of the torn-down (is that a word?) product. Not exactly the usual teardown style.

tekochip
User Rank
Platinum
Better than a Teardown
tekochip   1/4/2013 10:56:44 AM
Thanks, this is much better than a regular teardown, it's great to hear details on how design decisions were made and why particular components were chosen.

Page 1/2  >  >>
Partner Zone
More Blogs
Thanksgiving is a time for family. A time for togetherness. A time for… tech?
The promise of the Internet of Things (IoT) is that devices, gadgets, and appliances we use every day will be able to communicate with one another. This potential is not limited to household items or smartphones, but also things we find in our yard and garden, as evidenced by a recent challenge from the element14 design community.
Researchers have developed a new flexible fabric that integrates both movement and sensors, introducing new potential for technology-embedded clothing and soft robots.
If you didn't realize that PowerPoint presentations are inherently hilarious, you have to see Don McMillan take one apart. McMillan -- aka the Technically Funny Comic -- worked for 10 years as an engineer before he switched to stand-up comedy.
The first Tacoma Narrows Bridge was a Washington State suspension bridge that opened in 1940 and spanned the Tacoma Narrows strait of Puget Sound between Tacoma and the Kitsap Peninsula. It opened to traffic on July 1, 1940, and dramatically collapsed into Puget Sound on November 7, just four months after it opened.
Design News Webinar Series
11/19/2014 11:00 a.m. California / 2:00 p.m. New York
11/6/2014 11:00 a.m. California / 2:00 p.m. New York
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Dec 1 - 5, An Introduction to Embedded Software Architecture and Design
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Last Archived Class
Sponsored by Littelfuse
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service