A low cost mobile ECG monitoring device using two active dry electrodes

Mobile electrocardiograph (ECG) monitoring provides crucial information about the cardiac rhythm and system anomaly helping doctors to efficiently diagnose heart diseases. This paper presents the development of a low cost mobile ECG monitoring device, which early warms abnormalities throughout long-term ECG observation. For user convenience, two active dry electrodes are used as touch sensors. A buffer circuit is applied to remove the over-sensitivity effect of the electrodes. Experimental results indicated that ECG quality when using active dry electrodes is equivalent to that of wet Ag/AgCl electrodes application.