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Recent content by aeytr

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    Can't read negative voltage values

    Hi, I built an ECG circuit that works fine. Now I want to read ECG signal via arduino analog pins(I m usingpro mini/5V/16Mhz). The problem is I cant read negative voltage values. I tried some methods but none of them worked. Can you please help? Thanks. Regards. Ali Emre
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    HM-10 Bluetooth Module problem / wireless EMG transfer

    No,that was an ECG circuit. Circuits are similar but this is not about it.
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    HM-10 Bluetooth Module problem / wireless EMG transfer

    Thanks for reply, I think the problem is the crcuit connection. Because when I touched the EMG signal output pin to HM10, I cant see anything on the EMG circuit output. All I can see is zero avarage noise that is what I get from bluetooth signal, all zeros. Actually bluetooh module broadcasting...
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    HM-10 Bluetooth Module problem / wireless EMG transfer

    Hello, I have a EMG circuit with 3 electrodes. I wanna send the EMG signal via bluetooth. and I am using HM-10 for that purpose. At first, I have to say that I can broadcast a signal which is the voltage alteration on potetiometer. (Relevant circuit is given below.) That was just a test...
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    How to remove EMG artifacts from ECG?

    Thanks for information. I'll jus adjust my filters better. Thanks again. I have 2nd order notch filter for both mains electricity and EMG. I'll check my calculations again. Thank you.
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    How to remove EMG artifacts from ECG?

    Understood. Thanks for the replies.
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    How to remove EMG artifacts from ECG?

    Hi, Thank you for your useful response. I am a little unexperienced. Actually I dont even know how to add more electrodes. I guess, I should add more AD620XX and then use MUX but that is jus a guess. Do you have any books or something like that based on adding more electrodes? Thank you again...
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    How to remove EMG artifacts from ECG?

    Actually that is my referance circuit. I just changed AD705J with its equivalent(OP07) and added a notch filter to output. And my 0.03Hz HPF has 1000uF cap and 5k6 res. I can't see any differance.
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    How to remove EMG artifacts from ECG?

    Hello, I built a circuit that aquires ECG from electrodes on chest. When the subject is stable, I can get ECG with enough accuracy. But when the subject moves or takes a deep breath, I am getting a ECG mixed with EMG. I though my filters are okay, but apparently they're not. In short, I m...
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    ECG circuit design with AD620

    Hi, I am triying to built similar ECG circuit. But i stuck at iisolation side. Can you please help with that. Can you advise an example referance design of an ECG circuit for me. Thank you. Best Regards.
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    ECG circuit design with AD620

    I designed notch filter using LM358, but it not quite right. Did you analyze di freq response? Did it really worked? Would you please share the prospice output? Thanks. Ali,
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