By this week, I was constructed the circuit use the Microphone stethoscope and Condenser sensor as a sensor connect to op-amp (non-inverting circuit) and Voltage comparator (Switching circuit) to amplify the signal of heart beat and using the oscilloscope to get the input waveform of heart beat signal. Then, I was combined the circuit with the the successful done compile programm of Arduino software to try shown the result from the circuit join to the Microcontroller and try display to the LCD.
The first one of the picture below shows the connection of the circuit for the circuit testing to check the the combination of circuit function with all Op-Amp and the second picture shown the circuit connected with the Arduino kit.
Figure 1: Circuit testing
Figure 2: Connection of Arduino UNO
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