DIY EMG uses an audio recorder

[Ericdsc] is looking to capture the electrical impulses of his muscles by using an EMG. He went through several prototypes to find the right recipe for sensors to pick up the electrical signal through his skin. Above you can see the version that worked best. Each sensor is made starting with a piece of duct tape and laying out a patch of stripped wire on it. A 5cmx1xm piece of aluminum foil then covers this, and second smaller piece of foil covers the cable’s shielding (not pictured here). This will stick to your skin to hold the sensor in place after applying a dab of sugar syrup to help make a good electrical connection.

In this case, an audio recorder is taking the measurements. [Ericdsc] had been having trouble sleeping and wanted to find out if he’s restless in bed. The audio recorder can log hours of data from the sensors which he can later analyze on the computer. Of course, it wouldn’t be hard to build your own amplifier circuit and process the signals in real-time. Maybe you want to convert that mind-controlled Pong game over to use abdominal control. You’ll have a six-pack in no time.

Comments

  1. macegr says:

    Chuck Norris doesn’t need amplifiers on his muscles.

  2. rue_mohr says:

    this could also have uses to detect your level of sleep for a propmt system to help a person get into lucid dreaming, cause, if your not gonna get any rest while sleeping all night, you might as well be doing whatever you want.

    • mh says:

      Having issues with sleep myself, that is unfortunately not how it works. If I could harness all these hours being awake into something productive I would be rich…

  3. harviecz says:

    You have stereo input righ? What about using the second channel to eliminate the noise and interferrences? ECG uses at least three electrodes too. One is ground, the second is used to measure and signal from third is just subtracted from the second electrode to eliminate any unwanted interferring signals.

    You can even see it on the image:

    there is already some kind of noise in other chanel (probably 50 or 60Hz Mains AC hum). If you subtract this from measured signal you will get much cleaner output. If you also engage the third electrode sticked to the right place of body, you will get even more clean signal…

    BTW you can use sonogel used for sonography/echo (which can be obtained for cheap in pharmacy store) instead of sugar syrup. Piece of cotton or sponge soaked in salt water will also do…

  4. Hitek146 says:

    Title should have read, “OMG WTF DIY EMG uses an audio recorder”…

    LOL :)

  5. private_boolean says:

    Maybe I’m missing something here, but wouldn’t it just be simpler/better to buy a bag of electrodes?

    Why wouldn’t these work better?

  6. private_boolean says:

    that said, I think that it’s really cool that OP iso using the A/D converters inherent to audio recorders instead of a specialized component.

  7. Roel says:

    Nice to see low-tech body hacks. But I doubt that I could sleep easy with wires taped to my skin. Wouldn’t a motion-sensor (like one on your phone) do the job as good?

  8. kabukicho2001 said, says:

    comparing with EMG patterns your graph reads a neuropathy case? I’m not a Dr,

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