Calculation the precision of the conversion of bio-signals (heart sounds) in analog to digital and digital to analog conversion processes in ATmega 8 microcontroller processors using computer simulation

The research aims to calculate the precision transfer from the analogue to digital convertor (ADC) and the digital to analogue convertor (DAC) of the ATmega microcontroller series that are widely used in various circuits and their application of weak signals such as boi-signals, especially heart sounds signals.We chose the ATmega8 microcontroller and performed the measurements and results on the first heart sound (S1) after enforcement the simulations of an electronic stethoscope using the famous program proteus8 for electronic systems. We performed the analogue to digital conversion (ADC) for 20 samples of the signal and then we performed the opposite process DAC using 2R-R resistor network with 10 inputs.The results obtained showed a near perfect match between the signals before and after the conversion. Which suits this type of application.