Check out this cool open source business card

This “electroCARDiograph” (name by ldsnowbored on 9gag) measures the real ECG signal between the users hands (Lead I in Einthoven’s triangle, image from Wikipedia).

While it is not a diagnostic device, it is good enough to clearly capture the P, Q, R, S and T waves of the ECG signal, as shown in the video.

It is of course open source too, and its github repository is here. Click here for the schematics in pdf format.

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