Some doubts: Lilypad Arduino, Accelerometers and E-textiles

Hello all!

First of all, I'm a brazilian undergraduate Design student, and I'm very new at developing electronic projects (specially with e-textiles). I'm currently working on a malleable hand-held interface for my graduation project, and have been posting its development at this website:

Well, I've come up with the attached simplified schematics (just to communicate my needs and current intentions), and some questions raised from it:

About Arduino and the schematic:

- Will the raw data of the whole schematic (5 accelerometers to lilypad to bluetooth) be fast enough generated? - a frequency of 10 "readings" per second should be enough for what I intend to do with them. *

- How much power will the schematic consume? Are three 20mm coin cell batteries going to do the job? In how much time would they be drown out? *

About soft circuits and e-textiles:

- What is best to transport data and power through this interface: conductive fabric, conductive thread or even a really thin wire? - It is important that it could be folded, twisted and very resistant through time.

- Could you indicate any kind of textile more suitable for this application? - It should be just a little stretchy, and very resistant.

- Any ideas of how should I protect the components from damage by rough hand manipulation?

- Any advice about sewing the whole application?

(*) The main components:
- Arduino Main Board:
- Lilypad Accelerometer ADXL335:
- Bluetooth Mate Silver:

Hope someone here can bring me some light to these problems, but any kind of help, opinion or critic is welcome!


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Depends a lot on your exact circuit.

lgguts (author)  steveastrouk5 years ago
That's the problem: I'm actually trying to figure out those questions so that I can define my exact circuit. As I said, I don't have much experience on this... Won't this help?
You could run 5 of these, in normal mode, with 1.25mA. You could get clever, and shut them down periodically, to save power.

lgguts (author)  steveastrouk5 years ago
Wow, this accelerometer sure looks promising. I'm wondering if they come with breakout boards?

I just realized I've not posted the exact components I was planning of using - I'm updating the post and adding this.

I was actually thinking of using SparkFun's Lilypad Accelerometers. Here is the data sheet:

But as long as the LIS302DLH can be sewable, I don't see why not give it a try (as it looks to have more features and such).
Do I assume you'll want these things to be as thin and low-profile as possible too ?

lgguts (author)  steveastrouk5 years ago
Yes, exactly!
I don't think you can beat these for tiny-ness. Look for some "flexible PCB" material - you can spot it on Ebay occasionally. Its often used for making circuits that fit in very tight spaces, like cameras.