- Fri Apr 07, 2017 5:41 pm
#194308
Hi!
I've developed an ECG acquisition circuit that will acquire an ECG signal using a high CMRR, and uses active lowpass and highpass filters to filter the signal to a desired frequency range (0.5 - 150 Hz).
My signal output is clear but it is usually between -0.2 and +0.2 Volts and sometimes as small as -0.1V and +0.1 Volts.
I'm trying to apply a DC offset to this signal so that I can read it into an Arduino Mega (which can only read in voltages from 0-5V!) using AnalogRead() ?
I've tried to use a positive clamper circuit but my signal is too small to overcome the bias voltage of a diode!
Any suggestions as to how to get my signal in the positive range, without causing issues with my upstream ECG circuit?
Thanks so much!
I've developed an ECG acquisition circuit that will acquire an ECG signal using a high CMRR, and uses active lowpass and highpass filters to filter the signal to a desired frequency range (0.5 - 150 Hz).
My signal output is clear but it is usually between -0.2 and +0.2 Volts and sometimes as small as -0.1V and +0.1 Volts.
I'm trying to apply a DC offset to this signal so that I can read it into an Arduino Mega (which can only read in voltages from 0-5V!) using AnalogRead() ?
I've tried to use a positive clamper circuit but my signal is too small to overcome the bias voltage of a diode!
Any suggestions as to how to get my signal in the positive range, without causing issues with my upstream ECG circuit?
Thanks so much!