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  • eslipak commented on randofo's instructable Remove a Wheelchair Motor Brake1 month ago
    Remove a Wheelchair Motor Brake

    Thanks! Very informative (and handy). I wanted to know how to do this for a while now. Good Work!. Any other tip you have will be very welcome! Maybe any tip about wheelchair controler?

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  • eslipak commented on tanner_tech's instructable DIY Induction Heater1 month ago
    DIY Induction Heater

    Will do. Thanks a lot.

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  • eslipak commented on tanner_tech's instructable DIY Induction Heater1 month ago
    DIY Induction Heater

    Great Work!. But the image of the schematic is a bit blurred. Can please post the schematic as PDF? Thanks a lot.

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  • eslipak commented on hanlin_y's instructable Arduino-based Switching Voltage Regulators2 months ago
    Arduino-based Switching Voltage Regulators

    Great Work! ( incredible, in fact...). Well done. Learned a lot. Thanks.

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  • eslipak commented on abhiV4's instructable Arduino Buck-Boost Converter2 months ago
    Arduino Buck-Boost Converter

    Great Work!. Can please post a complete schematic including ACS712 and arduino connections? Also: what are the specs (continuous power/peak)?. Thanks a lot!

    Great Work!. Can please post a complete schematic including ACS712 and arduino connections? Thanks a lot!

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  • eslipak commented on Bananamultiverse's instructable How To: Make a Mechanical Hand6 months ago
    How To: Make a Mechanical Hand

    Well, i cant imagine how looks your design when moving, how looks when fingers open and close, etc. Is not clear for me from photos and descriptions. Even a short movie will help. Thanks a lot.

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  • eslipak commented on Bananamultiverse's instructable How To: Make a Mechanical Hand6 months ago
    How To: Make a Mechanical Hand

    Well done. Can please post a video?. Even short. Thanks a lot.

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  • eslipak commented on btidey's instructable Zero Security Camera7 months ago
    Zero Security Camera

    Hi. I have recently reviewed the ESP8266 as webcam over wifi, but it seem to be that the available speed to get image data with the serial GPIO's, useful enough for live video is not enough. Maybe using low resolution, you can get a rapidly changing set of still images, but nothing more. I wish i am wrong. If you know better, let me know.Be well.

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  • DIY 600 Watt Amplifier With Old Computer SMPS

    It is hard to be nice here... The title is highly misleading... And measures seems to be best (and unsustained) wishes...

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  • eslipak commented on mybotic's instructable Tutorial for Monster Motor Shield VNH2SP30 9 months ago
    Tutorial for Monster Motor Shield VNH2SP30

    Great tutorial. I do needed to interface this shield to an ESP8266 and this tutorial helped me to identify the pinout. Thanks!

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  • A Remote Dynamic IP Tracker for (almost) Free!

    Can please post the code?. Thanks a lot

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  • eslipak enrolled in CNC Class10 months ago
  • Super Simple Electrocardiogram (ECG) Circuit

    Well, a colleague after all :-). More to agree than to diverge.Sorry to hear about you lost Windows patent. What a shame. How would you name your company? (When i think of it, I do remember an old Mel Brooks movie. The evil was called "Bite and Devours" or something like that.) Just joking. Dont take me wrong. By the way, i am from Argentina. If somehow i do manage to go to Switzerland (very unlikely, i am afraid), let me buy you a beer.You are right. Is getting too long. I am getting too old too... I must shut up.Best regards.

    Well. I must agree with you... mainly. Calling it 'fake ground' was just a simplistic way to kickstart the original question. But, I must quote Wikipedia:"Leads aVR, aVL, and aVF are the augmented limb leads. They are derived from the same three electrodes as leads I, II, and III, but they use Goldberger's central terminal as their negative pole which is a combination of inputs from other two limb electrodes".Being picky, you said "Electrode 2 (left arm) (ie the heart as viewed from left shoulder - where the left arm joins the body!), using Electrode 1 as reference and Electrode 3 as a ground".Speaking strictly, we measure an electric potential against a reference, being this reference a simple one for bipolars (the other limb), or a compound reference for augmented ...

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    Well. I must agree with you... mainly. Calling it 'fake ground' was just a simplistic way to kickstart the original question. But, I must quote Wikipedia:"Leads aVR, aVL, and aVF are the augmented limb leads. They are derived from the same three electrodes as leads I, II, and III, but they use Goldberger's central terminal as their negative pole which is a combination of inputs from other two limb electrodes".Being picky, you said "Electrode 2 (left arm) (ie the heart as viewed from left shoulder - where the left arm joins the body!), using Electrode 1 as reference and Electrode 3 as a ground".Speaking strictly, we measure an electric potential against a reference, being this reference a simple one for bipolars (the other limb), or a compound reference for augmented (the other two limbs) or precordials (the three limbs of the Einthoven's triangle). Not a ground. Well. I do know. A ground lead most often does exist, but is connected to equipment's ground. On some (weakly designed) electrocardiograph, is used to improve mains hum rejection.Quoting Wikipedia again: "The precordial leads lie in the transverse (horizontal) plane, perpendicular to the other six leads. The six precordial electrodes act as the positive poles for the six corresponding precordial leads: (V1, V2, V3, V4, V5 and V6). Wilson's central terminal is used as the negative pole" and "The common lead, Wilson's central terminal VW, is produced by averaging the measurements from the electrodes RA, LA, and LL to give an average potential across the body".Wikipedia said things better than i can.On a personal note, I am a electronic hobbyist, from more than 40 years now. Yes. You are right, I'm not an engineer (surely you are).I developed this same thing for personal amusement more than 25 years ago, with opamps, and it was a pain, and a pleasure. The output was connected to an osciloscope with no persistence, so it was a pain to read. A trigger signal was also sent to a Commodore 64 to read heart's rate. Changing from bipolar to augmented to precordials was done with pushbutons. It was just fun and not for real use, even if it worked OK.But also I am an ICU M.D, for more than 30 years now. I can tell you first hand the huge difference between a weak or good designed electrocardiograph when you are in a RCP, massaging a heart, with all this movement interfering the readings, and you do need to distinguish what is happening inside the chest. And close enough is not enough when it defines if someone will live or die. (Yes. It is embarrasing. Is V1-V6, not V1-V5.)So, in my own opinion, for what is worth, for precordials you need what is properly called Wilson's central terminal.Ok. This is Instructables and i am being too much picky. But someone was enthusiastic about expanding this to be used on the field, so i think is better to say thing right.Anyway, you spotted a very weak design point: no low-pass filter. For any serious use is a must have.I enjoyed your other post. Maybe the article you was unable to find was "DIY EEG (and ECG) Circuit" by cah6, here at Instructables?. The link you posted "DIY ECG with 1 op-amp" is amazingly simple!Also, i do agree. 5v (or 12v) will do nothing to you (or me, or anybody). But discovering a just-starting PSU leakage when you connect your ECG machine to a patient can be... well... shocking. Because disaster strikes when no one expect this. So, for safety reasons, is better to stick to a battery source. Not because 5v will kill you. Because a PSU can fail after some time of use, and this kind of thing cant be prevented. (Safety First. A principle by which to live)By the way: I'm lucky enough to be NOT ruled by Mr Trump :) (I hope you do not either). But we live in the same planet. This is unlucky. Whatever happens on USA, repercutes on the entire world.. :(Be well.

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  • Super Simple Electrocardiogram (ECG) Circuit

    Yep. V1-V6. My bad. The circuit that you describe is called aVL, the "a" stands for"augmented". They are unipolars, like Vx, and they fake ground against the other arm/foot (Same thing for aVR, aVF.). Moving the electrode to the six points on the chest can give you readings, but they will be better with the "fake ground" circuit. Making medical diagnosis is a tricky thing, and it depends heavily on the quality of the signals. A little up or down of the baseline and you can do the wrong diagnosis. Other than this, i do agree with you.Best regards

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  • Super Simple Electrocardiogram (ECG) Circuit

    If i do remember well, V1-V5 are measured against a fake ground composed of left hand, right hand and left foot connected through 1Mohm resistors in a star configuration. The center point is the fake ground. Hope this helps. (A bit of googling will help too... ;) (Image stolen from Electrocardiografia.es)

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