Samartist 25 Posted June 2, 2013 Share Posted June 2, 2013 This is a heart beat counter, which displays the result on an LCD, it amplifies the signal by a dual op amp IC, and passes it to msp, as an interupt to count the number of pulse for 15 secs, it uses internal clock, so its not so accurate, but it will give you a good precised result... i have given all the neccassary information, including the schematic, the video link, and the code, with the header file.. here is its video... see the instructions to build it at http://www.instructables.com/id/Heart-Beat-Counter-using-MSP430/ lcd.h main.c pine, bluehash, spirilis and 3 others 6 Quote Link to post Share on other sites
bluehash 1,581 Posted June 2, 2013 Share Posted June 2, 2013 Maybe you should run around a little and sample your HR again :thumbup: . Nice project! Samartist 1 Quote Link to post Share on other sites
spirilis 1,265 Posted June 2, 2013 Share Posted June 2, 2013 That is awesome! Sent from my Galaxy Note II with Tapatalk Samartist 1 Quote Link to post Share on other sites
username 198 Posted June 2, 2013 Share Posted June 2, 2013 I assume 2 IR LEDs then for the pulse monitoring? 1 for shinning into your finger, another for picking up the change in the received LED brightness which the variations can be observed as beats? Something like that? Very sweet project, thanks for sharing! Samartist 1 Quote Link to post Share on other sites
simpleavr 399 Posted June 3, 2013 Share Posted June 3, 2013 @@username the ir pair should be 1 led and 1 ir sensor (photo diode? still a diode?) the vishay tcrt5000 is convenient to use as it comes in a single package and aligned already. it can be have in ebay for a few dollars (multiple units). i used that for proximity detection but it could also be used here for pulse sensing with op-amps. @@Samartist did u try just use the 3.6v from launchpad? the lm324/358 should work w/ 3v. any reason u need 5v? Samartist 1 Quote Link to post Share on other sites
Samartist 25 Posted June 3, 2013 Author Share Posted June 3, 2013 thanks to all of you friends... username the pair consists of an IR led and a PHOTODIODE, because ir can penetrate through human body more easily [i think] and the pulse generated by the heart affects the reception, which is then amplified and filtered by 2 op amp amplification stages, and then given to the msp430.... simpleavr it was necessary to give 5 volts, as the LCD works on 5 volts, and decreasing the voltage in the sensor section means decreasing the voltage for the IR, which effects the sensitivity... i have given nearly 4 volts to msp, [using 3 diodes in series] bluehashwhat is HR? Quote Link to post Share on other sites
bluehash 1,581 Posted June 3, 2013 Share Posted June 3, 2013 HR= Hear rate. Samartist 1 Quote Link to post Share on other sites
MattTheGeek 99 Posted June 3, 2013 Share Posted June 3, 2013 Have you considered turning it into a pulse oximeter? You just need to add another LED/Photodiode pair in red along with an additional AFE. Quote Link to post Share on other sites
Samartist 25 Posted June 3, 2013 Author Share Posted June 3, 2013 no i havent, thats very good idea thanks, i m searching for its contents Quote Link to post Share on other sites
pdr 0 Posted November 17, 2013 Share Posted November 17, 2013 Which type of photodiode did you use? Quote Link to post Share on other sites
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