Dear Scott, I am a physician, and I noticed that the electrocardiogram displayed in your video is full of interference and noise. The isoelectric line does not remain stable at 0 volts, likely due to muscle contractions in your arms during the test. As a result, you are simultaneously recording an electromyogram along with the electrocardiogram. Despite this, it is possible to distinguish the spike of cardiac contraction from the noise. Additionally, if you are otherwise healthy (besides your love for complex electronic circuits), you should not have a 92% arterial oxygen saturation at rest. Therefore, the oximeter sensor probably needs calibration. This is my first time commenting, but I would like to express my congratulations on all your videos. Each one is an educational gift to those of us who dabble in electronics as a hobby. Please continue your high-quality work, and it would be my pleasure to assist as a doctor in any application related to my field. Kind regards, Dimitrios

"And measuring my oxygen saturation was apparently no problem at all" Displays oxygen saturation of 92%. Either that's wrong or you should breathe some more ;)

As a person who works with ECG signals (mostly writing code that processes signals from wearable ECG recorders), the last demo showed basically a bunch of noise and almost nothing of substance. I saw a comment saying that You should add other electrodes and I agree because this signal is awfully reminiscent of what happens when one of the electrodes gets disconnected when using a virtual ground for ECG. For people who are more interested in the details, You can somewhat make out the R peak in the data but the T wave is so large (greater than R) that it is impossible due to heart physiology, T wave is the relaxation of the heart muscle and it is usually about 1/3rd of the height of R, and the P wave is also nonexistent which also should be impossible because that's the signal that starts the muscles moving in your heart.

Biomedical engineer here, that was a very noisy ECG a doctor can't use it to extract very useful reliable information from it. but it still shows your heart rate.

Hello Scott! I work in the medical device industry and so glad you have tested some biomedical electronics stuff! A couple of comments: 1. 92% SpO2 is far from normal. You'd expect a >95% on a normal, healthy adult. During resting state this value should be at >98% in most cases. (Remember during Covid times patients with an SpO2 value below 88% were considered critical and would require assisted ventilation.) As of the PPG waverform morphology it does make sense - the drift in the signal amplitude is likely caused by slow finger movements as suggested by the envelope of that signal. Actural SpO2 devices would normally feature a clip with the photodiode and LEDs (Red and IR) on either side, in order to a) limit the "volume" in which blood would circulate, and b) block ambient light to minimise interferences, so that changes in the oxygenated haemoglobin vs. deoxygenated can be calculated. This is a classic application of the Beer-Lambert law. 2. The ECG graph does not resemble anything like an actural ECG signal. Granted, you may think of the peaks as R-waves, but the waveform does not seem well-processed. ECG standards such as IEC 60601-2-25 and AHA clinical recommendations call for a high pass filter with a cutoff frequency at 0.05-0.5 Hz, a low pass filter at 150 Hz, and a mains notch filter at 50 or 60 Hz. The HPF is there to remove the baseline wander and respiratory signals, while the LPF for removing EMG from muscle contractions. It seems that the EMG from flexing your fingers are drowning the ECG signals from your plot. Maybe worth another try with stick-on electrodes, preferrably three of them, on the left arm, right arm and left leg. If this eval board comes with built-in right-leg driver circuit then you are in luck as it will greatly reduce the mains interference on your ECG signal, if you also connect another electrode on the right leg to the output of this circuit. It will invert the mains interference signal and re-inject it to the body, works like an active noise cancelling headset. 3. Electric safety is always an essential performance in medical devices. The electrodes you've touched are effectively type BF applied parts of a medical device (per IEC 60601-1). Hence it is required to have those galvanically isolated from the PSU (in this case, a laptop connected to mains). This can be satisfied if you insert a USB isolator with more than 2kV dielectric strength between its primary and secondary sides between the laptop and the eval board, OR disconnect the laptop from its charger and use a battery pack to power the eval board, if necessary. As always, very informative video! And I will see you next time! 😊

of course the health related devices like the last dev board are expensive as hell.

I designed the first evalboard for the Boreas chip and I'm so proud to see one of my boards finally presented on your channel!

The ECG tracing does not resemble an actual ECG. I think that the problem is that the board doesn’t have any filters to eliminate all the noise. Try applying a band pass filter with a low pass @ 150 Hz and a high pass @ 0.5Hz. Additionally, you want to eliminate the power interference by applying a notch filter and blocking the frequency of your mains power (50Hz in Europe, 60Hz in USA). That should clear the noise and leave the normal ECG tracing showing the P-QRS-T waves.

11:30 As someone else who has 3 arms, where do you get your shirts from?

My car has haptic feedback in steering wheel, it rattles when i go off the lane.

Thank you, GreatScott!, for featuring Boreas Technologies and our BOS1921 devkit on your channel. We are proud to see our technology showcased to your audience. Your thorough and engaging demonstration of our product highlights its user-friendly and innovative nature. We are looking forward to working with you in the future. Keep up the great work!

Love the way you explain projects and your writing.

I am an Electrical Engineer working in the Medical Devices field and I have designed EKG machines before. I agree with what the others said that what you have likely seeing is muscle noise. That is what an EKG system is designed to detect since the heart is just a big muscle. The challenge with using EKG from just a single pair of fingers is that there are a lot of muscles that are much closer than your heart That is why EKG system measure across the body. There single limb heart rate sensors typically use pulse oximetry. They use light to detect the cyclic change in oxygen levels that are caused by your heartbeat. They often do this by comparing the transmission or reflection of blue and red light. I will have to check out the chip it uses. I wonder how cheap I could make an EKG system now. There are some possible applications for this if they could be cheap.

Can you please make a video about a custom CB radio frequency digital transmitter? (Long Range alternative for 433Mhz modules) I want to learn more about using crystal oscillators for generating radio frequency...

Interesting video! The haptic device is quite intriguing. On the ECG I can only say that it seems that one can descern the electrical depolarization of the ventricles, so one could get info your heart rate, and if it is a regular or irregular rhythm. But more than that isn't discernable with this setup. Regular diagnostic ECG uses 12 leads, and a basic monitoring ECG uses at least 3.

Your drawings are the best

Haptics is not just vibration, but that's indeed the most common form nowdays, It covers all forms of tactile feedback; force-feedback is a subset of it just like high-def haptic-feedback (the kind that can reach audio or near audio frequencies. There is all sorts of other modalities, shear (applying a dragging motion to skin), puffs of air, small electric shocks, changes in temperature etc.

Thanks for sharing, that AMS gui looks sweet.

My SUV has hepatic feed back in seat and steering wheel for assisted driving and lane control and radar sensors. Of course phone and touch panels have had it forever.

The electrical activity of the heart is to be measured close to the heart. Whatever you read at the fingertips is not the signal you want.

Every video of yours are great. Could you also make an video about ESP32-S3 as arduino alternative?

Could you make the ultimate guide for using a NUCLEO-F767ZI, the board that has 144 I/O pins and is way cheaper than a real Arduino Mega?

The size and amount of components required for the haptic feedback module, makes apple fitting haptic into iPhone 6 around 10 years ago, very impressive.

3:44 on my car my steering wheel has haptic feed back for when your crossing the line when you start slipping out of the lane. i love it it does also do it depending on the side of the lane I am going into. left is left of the steering wheel and well so on. it works well.

This is a technology I agree that we will see a lot in the future. Hopefully, haptics will evolve to cover interaction within virtual reality spaces. This is a great start on the topic.

The haptic feedback of the Steam Deck touchpads is one of the most incredible feel. The fact they are not clicky and yet when absolutely fools your brain into thinking they are is just perfect.

Always waiting for your projects

Heya! Love the video, I'm definitely getting that Body Sensor board as well, that's pretty awesome! Just gonna say tho: If your SpO2 is actually only 90%, you should get that checked out. Normal SpO2 is 95% and above and lower could indicate a mild respiratory desease.

Years ago i had a Motorola Rokr phone that had no buttons, but used some kind of haptic feedback that feeled like you clicked a button. Best i know so far.

Hey Scott, I have a Card10 badgefrom the CCCamp 2019(an electronics "dev" board given out at conferences), which has an ECG sensor as well, and the trick to taking good measurements using these tiny devices is calibration and being very still. The calibration(for what I guess are filters) on (at least my) devboard is handled by the front-end chip automatically, and takes a few seconds(up to 30), but you can clearly see when the data becomes "filtered". Maybe you'll even get some extra parsed data then. Any type of movement will probably give you a noise spike in the data and might interrupt calibration, so try to remain still. And good contact also helps, my badge needed to be pressed quite firmly to get a good reading. You can identify a good reading mostly by it looking like one of those TV heart monitors that go beep-beep(You know what I mean, right? :P).

The button click on the piezo actuator my brain loves that

One good use would be putting it in the accelerator pedal of a drive by wire vehicle that has a manual transmission inorder to give the driver more of the engine feeling that the old cable operated throttle body’s used to provide.

The haptics will run much better using an amp and wiring as a speaker, ps5 uses certain frequencies for the feedback, Iv had a play around myself, interesting

Never seen a withings watch in such a bad condition 😂😂😂

6:29 Hello Great Scott! You could also use small Photodiodes like the Osram BPW34 for these ultra low power applications

Really interesting video, as always. Looking forward to the next one!

This piezoelectric technology of the future has been around since 1880.

PS5 voice coil actuators are available online. Plenty of broken PS5 controllers on ebay.

10:20 you see those green/yellow/red inputs? Those are for ECG electrodes I guess. A real ecg outputs multiple graphs and is only possible with electrodes at the right place

3:40 haptic feedback integrated in divers chair would be an good idea.

Congrats on the mouser sponsor

Play around with some "tactile transducers". Super popular for haptic feedback on racing/flight simulators and turning normal objects into speakers!

Great video, thank you! I love the HR thingie. Man, your watch has seen things :p

If that was a genuine good ecg tracing, you would need defibrillation! Too noisy to use.

Regarding EDA, usually, the signal is filtered and processed to detect rate of changes. In conjunction with other signals (like ECG) it becomes a good indicator of changes in emotions, so smartwatches use it to detect stress, unrest, etc. As far as I have read, the main issue is that the patterns are highly individual-dependent. So currently smartwatches/phones train a machine learning model with your data for about two weeks (inviting you to also label events, i.e. indicate how you were feeling in certain identified "events"), so they can eventually identify these events automatically. I guess this is the reason you don't see any useful data in the DevKit, it would have to implement a detection technology and then train it with a bunch of data first.

So, can I become a pro chess player with this?

I love those piezohaptic peripherals. For one of my current projects it just made me think to replace the small exciter (audio transducer/resonance speaker) i use. Then I looked at the price (not only the sensor but also to drive them) :}

Oh hey, my man discovered Nintendo HD Rumble.

Lovely video! I wish it was a little longer though!

Apple uses the same tech in their Touch Pad on their modern Macbooks and they're actually really good, makes you think you're actually pressing a mouse when in reality it's just this type of "Motor" producing the vibrations

I cannot wait to implement something for my favorite Ultrakill mod

Dev boards a quite expensive - and the Boreas 9121 is only available in a minimum of 2500 pieces. Not an easy start 😉

4:04 another name for the kind of haptic feedback device like in the ps controller is exciters or surface transducers and they are great, relatively cheap and super easy to drive. You can get small ones from dayton for like 5 bucks or so

11:25 I think the graph is showing you, in compartment with the cosmic incoming radiation, your biometric cycle for when you will be most fertile for the next coming 3 days!

Haptic feedback has been around since around the PlayStation 2 era (probably earlier), though that was more a lopsided motor rather than a piezoelectric buzzer.

Another great video Scott!

Great Video Scott! (See what I did there?)

I love that piezo device. It would be great in a video game controller. I have doubts any major vendor will use due to concerns it requires such a high voltage in device so heavily used and often damaged due to abuse.

Bro ue explanation is better than our school fr!! Love from india!

Mouser is one of my favorites out there. Nice they sponsored you.

my first experience with habtic feedback that wasnt a standard rumble motor was on the Steam Controller. when i tested it with the old steam big picture web browser and scrolled trough a page, the controller gave me a habtic feedback of a scroll wheel with a hard collision at the end of the page.

You only first tried it with the DualSense controller? Never used the Steam Controller, or an Apple device wirh taptic feedback? Or HD rumble on Nintendo Switch?

Can YOU try cheap and expensive smart watches for their heart rate monitoring feature and explain how do they work and how much should/can we rely on it

I'm no expert but I think you need to apply filters to find the muscle electric signal. For example to find your heartbeat.

could you make it sound better by putting it in contact with something that would resonate along with it, like a tuning fork on a acoustic guitar body?

Very educational. I've worked with piezo actuators - they can be tricky to drive. I think it's more sensible to use coils. They're cheaper to make and easier to drive and read. I've used coils to make a processor controlled bass instrument in a small box.

Wait... You've NEVER experienced a haptic feedback device until using a PS5?! How is that even possible?? 😂

I have two "taptic engines" from old iphones in my bikes handlebars one either side that basically give me a reminder after 20 seconds on time that i've left them on or dam these traffic lights are slow. I see too many bikers around leaving indicators on as who has time to look down notice a tiny flashing light , it should be a standard feature , I loved haptic feedback!

That Piezo module could be used for sonar. You ever hear of a Pebble smartwatch? I was fortunate to have one. Sadly they are no more. All this wonderful technology in module form or SOIC, it's amazing no one has made a fully functioning Pip-Boy, Tricorder or Jordies visor. I've seen a lot of imitations, but never the real thing. I always wanted to see a visualization of the electromagnetic spectrum when looking at boards for faults. You would think with as long as MRI tech has been around, someone would have come up with some DIY applications. I played around with those cards that allow you to see magnetic fields to some degree . Those are fun, particularly on inductors. I actually bought a phone with a FLIR built in because I was tired of burning my fingers looking for the short circuits. Imagine a single device that would allow you to see a huge swath (100μm-1nm) of the Spectrum compounded with magnetic resonance? If we could actually see the EM fields in a device as its working, we can diagnose faults and fatigue super fast. Couple that with ultrasonic hearing and you have the ultimate diagnostic device.

Always wondered how haptic feedback worked...very cool, I never would have guessed a voice coil!

...am I the only one who immediately thought about the Smartphone Vibration Motors and haptic feedback when typing on virtual keyboard?...

IMHO having haptic feed back through the steering wheel would be a bad idea. I like the fact that I can feel the road and how the front drive train is performing and pick up on new vibrations and the like; these can be an early indicator of a mechanical fault or hitting something when revering/parking/etc. Adding external vibrations to the steering wheel could potentially mask an issue! :-(. I'll stick with the beeps.

Try using a calculator solar cell for the energy harvester board

Reminds me if those lollipops or toothbrushes that had music vibrate into your head

0:43 fun fact, the click in macbooks is haptic

Some of the haptic sound stuff reminds me of the bit-banging we used to have to do to get 1-bit sound out of a PC speaker before sound cards were invented 😁

These development kits look pretty cool. For the EEG, I share the opinion of others on the noise. For the haptic device, isn't there a kit at Sparkfun?

I was so confused when I decided to charge my DualSense from my computer. I kept hearing audio coming from somewhere but couldn't place it. Despite the controller being turned off the computer was treating the haptic motor as a sound device and the controller was playing audio through the vibrations against the desk. 😂

0:30 Controller Display lag = 7 frames. Video FPS = 30, That's 233 ms.

the original teardown for the ps5 on ifixit shows a voice coil from foster

Use a Solenoid to Get Realistic Effect in Games .

Really interesting stuff indeed! Thanks, dude! 😃 The solar board would be really interesting for a garden lamp... But it would definitely need higher voltage. Anyway, stay safe there with your family! 🖖😊 BTW, brush robot build with that motor! Please! 😂

Very interesting Scott thanks 2x👍

Scott has a third hand!

I use bone conducting headphones... Cheap ones (some are fake) but they work well enough for podcasts and yt.. You're not getting a really rich range but they're essentially the same things just tiny.

Should be able to feel the buttons imo. Especially on a car touch screen....

I will put those vibration Moters on my Cherae and connect then to my doorbell, when I listening to loud music on my headphones will give me feedback! oh, I don't have doorbell.

Blood oxygenation at 92% means you are have oxygen issues 😰 Less then 95% you have hipoxia. Those board or sensors are so far away to be accurate, do not use to track your health.

Make video on Cree led flashlight driver how it works and how to diy one

I love these types of videos

Kia has haptic feedback in the steering wheel.

92% sp02!! 😲😲 Eeeek!! Get out in the fresh air 👍 I hope the sensor is off in its measurements 🤞

you can't understand how confused i was when i read the title of this video as "I FRIED Future Technology!" i was like "HE WHAT?!?!?!" had to re-read it cause appearantly i have dyslexia😂🤣🤣🤣

The last one is pretty impressive😍

I've commented this on the hacksmith before but I'll say it again, the haptic motor Is perfect with a near distance sensor for alerting against creeps. Especially in the most precarious of event situations such as e3 or any other compact conventions

Another great video. I don't agree with putting haptic devices in steering wheels. The first thing I do when I get a phone or play on a playstation is turn off the haptic feedback. I'm not sure what I hate about it but I certainly do not like it. If it was in my steering wheel it would drive me completely crazy!!!

Love AMS OSRAM, beautiful company!

first time expirienced haptic feature on ps5? no hate but nintendo switch and iphone starting with 6s is way longer on market, and by the way its easy to solder onto it

Most of these are already on my wrist 😋

you should've used a potato for the energy harvester.