The stethoscope has been used for many years, and has been very effective to diagnose certain cardiologic and pulmonologic sounds. For many years healthcare professionals would listen quietly to patients internal organs so they could diagnose from specific sounds of such internal organs. The objective is to develop a Peripheral Interface Controller based digital Stethoscope to capture the heart sound. The proposed designed device consists of following hardware stages: Front-end pickup circuitry, PIC18F2550 microcontroller, (128×64) graphic LCD and a Serial EEPROM. The captured data can be sent to PC for software analysis using LabVEIW. A digital stethoscope would help healthcare professional record their findings on a Serial EEPROM. Once the data is stored, the healthcare professionals can hear and plot the graph. This would be quick and more effective since there is a visual and audio representation to diagnose such cardiologic sounds.

1. www.ti.com/medical/digital stethoscope (Digital Stethoscope Model).
2. R S Khandpur, Hand book biomedical instrumentation, 2nd Edition, Tata McGraw Hill publication, 1990
3. D Patnaik,“Design and Development of Heart Sound Monitoring System”, IE (I) Journal-CP, Nov 2003, vol. 84, pp. 56-59.
4. Salih Arslan, Koray Kose, Mehmet, “A Design of DSPIC Based Signal Monitoring and Processing System”, Journal of Electrical and Electronics Engg., Nov.2009, vol 9, pp. 921-27.
5. www.microchip.com (PIC18F2550 datasheet)
6. Leslie Cromwell, Fred J Weibell and Erich Pfeiffer, Biomedical instrumentation and measurement, 2nd Edition, PHI Pvt. Ltd. , 2006
7. Paul Horowitz, The art of electronics, 2nd Edition, Winfield Hill Cambridge university press , 2004.
8. T.S. Yogeeswaran, D, Daya, I. Wasudeva, “Construction of a low cost Electronic Heart Sound Monitoring System”, Proceedings of the Technical sessions,2008, pp 72–77.
9. Elias U,B., Khadra., Abbasi, A.H., Mohammed, “ Time -Frequency Analysis of Heart Sound” , IEEE TENCON,1996, pp. 553-558.

Digital stethoscope Heart sounds PIC18F2550