Jump to content
Sign in to follow this  
Samartist

Heart Beat Counter [on LCD] - msp430g2553

Recommended Posts

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/

post-32560-0-25409900-1370199126_thumb.jpg

post-32560-0-34900700-1370199157_thumb.jpg

post-32560-0-55274900-1370199179_thumb.jpg

post-32560-0-89582600-1370199206_thumb.jpg

post-32560-0-18016500-1370199227_thumb.jpg

post-32560-0-61697800-1370199250_thumb.jpg

post-32560-0-97920300-1370199275_thumb.jpg

post-32560-0-41498800-1370199301_thumb.jpg

post-32560-0-93258400-1370199316_thumb.jpg

post-32560-0-73761300-1370199322_thumb.jpg

lcd.h

main.c

Share this post


Link to post
Share on other sites

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!

Share this post


Link to post
Share on other sites

@@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?

Share this post


Link to post
Share on other sites

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]
 

 

bluehash

what is HR? 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...