Is this an MSP430?

[bluehash 1,581]

Saw this over at reddit:

http://sensebridge.net/projects/heart-spark/

[cde 334]

An arduino-compatible circuit captures each beat as it happens and flashes LEDs

 

Nope

 

And I wonder how much the sensor is, because nearly $75 shipped? Ouch.

[bluehash 1,581]

Thanks, I missed that.

[NJC 17]

If theres interest, I might be able to post some code with a circuit to do this. I'm currently working on a small side project where I do some DSP to recognize the heart beat in an EKG (called QRS detection for those who are curious).

 

It's a cool idea for sure! Maybe it would even be possible to make the necklace smaller and more like a piece of jewelry. Could use a small battery on the back of the neck, and use the metal chain to conduct electricity to a pearly light type thing... too bad I didn't see this earlier, would have made a nice silly Christmas present.

[bluehash 1,581]

If theres interest, I might be able to post some code with a circuit to do this. I'm currently working on a small side project where I do some DSP to recognize the heart beat in an EKG (called QRS detection for those who are curious).

 

It's a cool idea for sure! Maybe it would even be possible to make the necklace smaller and more like a piece of jewelry. Could use a small battery on the back of the neck, and use the metal chain to conduct electricity to a pearly light type thing... too bad I didn't see this earlier, would have made a nice silly Christmas present.

 

Of course, NJC , we love your detailed writeups.

[juani_c 66]

If theres interest, I might be able to post some code with a circuit to do this. I'm currently working on a small side project where I do some DSP to recognize the heart beat in an EKG (called QRS detection for those who are curious).

 

I'm studying bioengineering and i really like those projects that involve biomedical data acquisition and processing. I want be able to implement it but it would be intersting to see how it is done.

[NJC 17]

I'm studying bioengineering and i really like those projects that involve biomedical data acquisition and processing. I want be able to implement it but it would be intersting to see how it is done.

 

I'm REAL glad you mentioned this! Here's why: I just did a search to see if I could find a link for you to the IEEE document that explains the algorithm I am using for beat detection. I have an IEEE subscription so I can get the article, but I'm not allowed to just share it with everyone sadly. Anyway, my search led me to the actual document I use on a random universities website (not sure how they get away with posting it though, I won't ask, lol). Though heres the interesting part, the university provides an errata sheet at the end of the article which corrects a few errors which I did not know about!

 

Enough of my rambling, here is the link to the site: http://www.engr.wisc.edu/bme/faculty/tompkins_willis/Pan.pdf

 

If you also have questions about the analog side of Biomedical Instrumentation let me know, I could also recommend a few textbooks which are great resources. Though the circuit for an EKG is VERY simple.

[juani_c 66]

THANKS! I'll read it.

The EKG

[NJC 17]

Well here are a few pointers. Its much easier to use an opto-isolator with a digital signal than an analog one, the only thing to look out for with using a digital stream over an opto-isolator is how fast the isolator can switch at. I use 2 AAA batteries and use the built in isolation from the MSP430F5528 chip for USB (no idea if this is really safe enough for me to let anyone else use it though). An easy way around that is to also just use 2 MSP430s connected via IR, the one thats hooked up to the analog stuff is battery powered. A good rule of thumb, have no possible connection between yourself and ground.

 

PLEASE NOTE: This is just the ramblings of a crazy engineering student. Only put electrodes on your body at your own risk. Do NOT to hook ANY electronics up to your body or anyone else's. So please, do not take my crazy assumptions and thoughts as facts, no matter how factual they may sound. (Be careful please, :-P).

 

Books I have and like for Biomedical related electronics stuff. The books are expensive new, but I found great prices of them used ($30 each).

 

Design and Development of Medical Electronic Instrumentation

http://www.amazon.com/gp/product/0471676233?ie=UTF8&tag=msp0d-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0471676233

 

Medical Instrumentation Application and Design

http://www.amazon.com/gp/product/0471676004?ie=UTF8&tag=msp0d-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0471676004

[juani_c 66]

Thanks I'll check out those books.