Can't read negative voltage values

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aeytr

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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
 

Simply apply a positive DC offset voltage to the signal so that it never goes negative unless the signal strength increases.
 

Hi,

I think ECG signals need no DC measurement, therefore a capacitive coupling and biassing to ADC_VRef/2 is a solution.

Klaus
 

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