Collin's Lab: Infrared heart sensor
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- เผยแพร่เมื่อ 29 พ.ย. 2009
- The beating of the heart is often recorded via sound or simply with touch - but there's also another interesting and somewhat lesser known option - light. An infrared emitter/detector pair can be used along with a programmable microcontroller, to effectively visualize the effects of the human body's hardest-working muscle.
blog.makezine.com/archive/2009... - วิทยาศาสตร์และเทคโนโลยี
You can add a different LED, say green, which will not be influenced by the changes in saturation, and use it to form a 100% value reference, then count the difference between the green and IR light intensities to get the saturation percentage.
when the light hits the phototransistor, the the transistance (or what ever the measurement is) changes. but how the change affect everything before it (as in the power going into the analog input) plz answer!!!
@ghilliesuit99 u can use a infrared flashlight instead but for the detector it would have to be like a flashlight too cause thats wat adds range but i dont know how to match up the detector with the right infrared led from the flashlight
Nice waveform. Much better than I get with that recycled crap used at the hospital. I usually have to go through 2 or 3 (sometimes more) before I can get a decent waveform and even then it is difficult to impossible see the dicrotic notch (usually depend on art line or ventric for that anyway). However, they are not infrared, just red, and are measuring O2sat. I was thinking of building a electronic stethoscope with variable low and high pass filters that can be adjusted for the bandpass range needed to isolate the sound you are wanting to hear. Just havent had time as of late but it would help me out a lot... and my patients...
could you post links to the programs you used to read and graph the data?
the project so far is a good start. Personally I'd try to get it to read the heartbeat from my neck or wrist using some kind of ribbon or strap. The emited signal should then be picked up by a program that translates it into actual BPM or maybe some visualization like you have in Winamp or WMP but instead of seeing sound you would see your heartbeat!
Does it work to a distance of about 2 feet? I want to make a light that is on aslong as there is someone(me) in front of it. Please help.
how does it work? Is it because that the skin moves up and down when blood flows. Or could you make a heat senser or something.
is there any way to add range of any sort for this?
Any specific type of marker? Or should I just get some clear plastic tape and start testing through all markers I can find? :)
0.o.. where did you point it to get a good recording?? thx
Can it attach to somewhere else like wrist / arm ?
Whats that multitool you use in 1:15
Where did you get the program for this project.
Hello,
can you please show me the Processing program? Thank you.
mine doesnt work :(
the graph changes acording to the IR light reflected off a white sheet, but not with an artery, maybe its because i have low blood pressure? or maybe my resistor has to be higher...
Nice work!
great work
Thats pretty nice!
Would be great if you could get an audiable output for sound effects. A lot of noise is generated when using a mic; I would imagine this is cleaner.
In the ER we use a device called a Pulse Oximeter. This uses infered to measuse the percentage of oxygenated blood running throught the capilaries in our skin. If you are ever getting your vital signs measured and they put a little clip on your finger that takes your pulse and has a little red light on it, then you know you have a pulse oximeter on your finger!
But would it work if im not moving? Sorry if this is a dumb question
What if you used sound detectors to pickup the pulse of he heart. It has 3 sensors that using a computer to detect
and position the sound using the differenual of he sound. Idk if it would work but if it did you could locate a person or several people before you go into a room. Military applicaions "if it works and it alrready hadn't been done"
this is the only makemagazine project I ever did myself...lol
but instead of the arduino I used the mic input of my computer and a soundcard oscilloscope program... it worked REALLY well! try it!
Colin is awesome, and so is this pulse oximeter
What can I do to make this work without an arduino?
It's called a pulse oximeter. You can buy portable ones that not only show the waveform, but they also display the % of oxygen saturation in the blood (thanks to the light absorbing properties of hemoglobin). You can get them for about $60-80.
what software is he using to create and display the graph??
The software is called processing(it's actually the same IDE used in arduino IDE).
I tried this in the past with a webcam and bright light (thumb over the webcam, held upto a bright light), but could not get a recognizable pulse.
Anyone else ever try this approach?
awesome..as usual
And you can also modify the code to get the actual blood oxygen content too. That's how the professional units do it, bounce infrared light into the skin and then do a calculation based on the reflected light value.
you could atach a beep sound or hertbeat sound to the graph software and evry time the graph peaks a sertin point it would make a sound of your choice
@Stephen Ryan You cannot. The arduino is what relays information from the actual circuitboard to the computer.
midi trigger for an instrument?
when it displayed the heartbeat using the little graph thingy I had the video int full screen and it looked like a screensaver
still a pretty cool device
I wonder if it would work with a CNY70.
hi guys who can help? what is the best way to get sound recorded from human heart beat? any tool or equipment to use?
A microphone.
it looked like you had some specks of sharpie left, alcohol based hand sanitizer takes sharpie off so many surfaces so easy! If its going to work on the surface, it takes sharpie off like dry erase.
Nice vid.
As an EMT-Intermediate who uses this technology everyday I can tell this is your basic Pulse-Ox device, without the actual reading of oxygen amounts in the blood!
thats amazingly cool
you could run it true amplifier and speakers or maybe use the ms20 filter from your monotron, you could even sample it and pitchshift te signal to the wanted frequency in ableton.
pretty cool
If you use more emitters to get stronger IR (perhaps IR lasers could be used?), perhaps you could use it to read brain activity? (parts of the brain that get used more suck more blood in)
it could be used to make something like a tricorder off or star trek to help medical people diagnose heart rates out on the field or used in a bio-bed (again from star trek) to cut down on the large equipment and if it can be used at a bit of a distance it could also be used to detect life signs from someone you can see yet cant quite get to the medical usage is limitless if you think about it
awesome
@Nadrealis
Actually all a pulse oximeter does is look at the COLOR of the blood. It's really interesting how they work.
that's pretty awesome
how about a video showing how to make a polygraph machine. The Infrared heart sensor could be a good way to measure the hart beat so that's a good start. (just an idea)
I love the bass in this video @.@
Neat i think I might make one.
why do you and kipkay both say 'sodder' instead of solder? is it an american thing (no offence if it isn't!)?
Entirely correct. I interpreted his question as "Can the device be made to work without a part filling the arduino's function?", in which case you're going to have a bad time.
Not passing on the collected data to any processing unit kind of defeats the purpose of the sensor to begin with :/
I'd like to see some coding that would give you a reading of your oxygen saturation by giving values based on color shift.
you could use it to see how scared someone is when they see a picture. Or maybe as a key only the most relaxed person can enter.
pretty cool^^
i was thinking the exact same thing!
Well beam me up Scotty. That could very well be the great, great, great grand daddy of the sensor that McCoy used in conjunction with his tricorder. Humm now all we need is a Hypo spray.
So how can u translate the recorded waveform into an understandable language, say BPM?
Your comment fits your profile Pic!!
its just a matter of calculation via, programming or from visual interpretation derived from the graph. Once you can detect the heart beat you can make an app, or embed this idea into a project.
Have your micro controller count the number of peaks over the last 60 seconds. Have it do this according to the refresh rate you want.
example - you want it updated every one second, have it perform the 'past 60 sec' count every one second.
Really bored? have it measure the time between peaks and let you know if the heartbeat is regular or irregular.
Anything more involved would require measuring the voltage across the heart (EKG) noting amplitude of, and time between peaks/troughs then comparing them with known rhythms so a "choose all that apply" program can attempt to tell you what you see (or don't see). Basically an oscilloscope with an instruction set.
Many other options. This is the most simple I could think of.
Hey we built one of these in my circuits 1 class back when i was a freshman in college.
You could make "Body Beat" Have sensors for some parts of the body and make music!
Cool, a pulse oximeter. With a little coding change you could probably get blood oxygen saturation too.
what if he converts those signals into music?
@Imot744 I was thinking about that
yeah thats what i was thinking to! :)
sweet
i fucken hate it wen ppl do that! it pisses me off! ur totaly right! much respect
set up a bunch of them in a grid array and see if you can make a biometric handprint locking mechanism
Pretty same concept is used to measure the %O2 within the blood.
You have build a very simple SpO2 meter. 30 USD on ebay :-)
heart beat detector from COD6!!
goooood
damn straight
@crubba it is I'm pretty sure. We like letters that have no purpose
could be used in gaming, to blur the vision if you get stressed or something.. :D
This isn't new. Susumu Nakajima first used this on a patient in 1975. We have used it daily in the hospital environment for more then a decade.
I tried with a optocoupler "TCRT1000" but I wasn't able to get heart rate from the raw data. However, when passed through 1,000 gain op amp, I was able to detect my heart rhythm... Making one is better then just buying one of those optocouplers.
Time it for 60 seconds, counting the peaks for that 60 seconds, and that's your heart rate, we have the same kind of thing on an ambulance, it tells us your pulse, and the percent of oxygen in the blood. :)
I remember near everything he says.
For biometric scanners to be sure you have a live human.
i have been using something similar for a long time to let me know when i'm dead.
I wonder that to.
you could in fact use this as a sort of biofeedback device and train yourself to raise & lower your heartbeat at will.
ok.. that'd be a really interesting idea... put that with the x-box's new version... the tower or whathaveyou
Tight
you could hook it up to one of those cheap "beating heart" LED kits
Instead of calculating your hearthbeat while running with your finger, you can use that device to calculate it.
@kd1s I have a pulse oximeter, but I fear it's cost is probably over $5,000.00 so I'm not opening it up lmao.
I have a good idea for using this:
give it the girl on a first date and let it transmit the dates to your bluetooth cell phone, than you can see how excited or bored she is when you're talking :D
This could be used to detect who is still living when disaster occurs ( maybe earthquake )
Oh gosh darnit! I guess all those cadavers in my basement just won't do :(
0:48-1:06
It uses infrared-light. Kinda the same concept of how a CD player works
That's what I was thinking...
The back ground sound is very distracting.
thats just how a sats probe works
the heart beat sensor* on call of duty* doesn't use touch or infrared light. If it did, you wouldn't be able to see through walls with it =P
that would be a really good way to see if someone is alive ;)
You could use it as a Lie Detector >=)
what did arduino ever do to you D:
I think it is, whenever I hear the 'l' pronounced I tend to think that person is saying it wrong - until I realized it was all the brits using the 'l'. So I guess that means us yanks are dork'in up the English language, which I must admit we excel at!
yeeeeeeeeeeee
Most modern pulse oximeters work with this technology.