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Hacked Gadgets Forum Index
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  Topic: reading data from a heart rate belt
sliders_alpha

Replies: 0
Views: 7883

PostForum: New Projects Currently Being Developed   Posted: Mon Nov 28, 2011 10:35 am   Subject: reading data from a heart rate belt
Hi,

so today I took my hammer and opened my "Kalenji hear rate belt"

I was expecting to find a microcontroller and some kind of 433MHz emitter, instead there is only analog circuit Sad ...
  Topic: designing an antenna to transmit a VLF signal over 10 meter
sliders_alpha

Replies: 3
Views: 14599

PostForum: New Projects Currently Being Developed   Posted: Thu Mar 25, 2010 9:31 am   Subject: designing an antenna to transmit a VLF signal over 10 meter
AWE-SOME =D

i didn't tought about filtering it, know i kinda ha something (it doesn't look like their signal tho, but i'm in france, and i think we are using GS1)

http://sliders.alpha.free.fr/pr ...
  Topic: designing an antenna to transmit a VLF signal over 10 meter
sliders_alpha

Replies: 3
Views: 14599

PostForum: New Projects Currently Being Developed   Posted: Wed Mar 17, 2010 8:06 am   Subject: designing an antenna to transmit a VLF signal over 10 meter
well, don't bother^^

this signal is shit, i've talk with some people and my spectrum shouldn't look like this

it's because the "resonance" frequency of my coil was too high so i didn't ...
  Topic: designing an antenna to transmit a VLF signal over 10 meter
sliders_alpha

Replies: 3
Views: 14599

PostForum: New Projects Currently Being Developed   Posted: Tue Mar 16, 2010 3:42 am   Subject: designing an antenna to transmit a VLF signal over 10 meter
hi,

so, i've retrieved a signal from a remote, i've use a coil of copper wired, around 30 turn around my hand, and capture it with a PC sound card

http://sliders.alpha.free.fr/project/cart/Locki ...
  Topic: heart beat sensor, oximeter hack
sliders_alpha

Replies: 6
Views: 20963

PostForum: Electronic Help   Posted: Mon Feb 09, 2009 12:22 pm   Subject: heart beat sensor, oximeter hack
project is now paused because of real life issue (my graduation project is not as easier as i though^^)
and i suspect this sensor to be broken so i need to buy a other one.

but i'll be back =D
  Topic: heart beat sensor, oximeter hack
sliders_alpha

Replies: 6
Views: 20963

PostForum: Electronic Help   Posted: Tue Jan 27, 2009 2:47 pm   Subject: heart beat sensor, oximeter hack
i just received it today.

here are my first readings :

red led VF : 1.9V @ 20mA
ir led VF : 1.3V @ 20mA

are you sure that it is a phototransistor? because only diode have anode and cathode, ...
  Topic: heart beat sensor, oximeter hack
sliders_alpha

Replies: 6
Views: 20963

PostForum: Electronic Help   Posted: Tue Jan 20, 2009 11:12 am   Subject: heart beat sensor, oximeter hack
thanks, how did you find this?
  Topic: heart beat sensor, oximeter hack
sliders_alpha

Replies: 6
Views: 20963

PostForum: Electronic Help   Posted: Mon Jan 19, 2009 2:05 pm   Subject: heart beat sensor, oximeter hack
hi,

i need to measure my heart beat rate in order to fulfill a project.
my goal is to know if i'm in REM phase or not while i'm sleeping.

after some research i've found that you can do it simpl ...
 
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