MOST OF BLOOD PRESSURE (BP) MEASURING DEVICES NOWADAYS RELY ON A COMMON CONCEPT OF INFLATABLE CUFF TO THE ARM WHICH APPLIED AUSCULTOTARY OR OSCILLOMETRY PRINCIPLE. BY HAVING A CUFF, THE EFFICIENCY OF THE DEVICE WILL BE REDUCED IN TERMS POWER CONSUMPTION, RESTRICTION OF FREQUENCY AND ALSO EASE OF USE. THEREFORE THIS PRESENT INVENTION IS AIMED AT DESIGNING A NONINVASIVE CUFF-LESS BLOOD PRESSURE ESTIMATION SYSTEM BASED ON PULSE TRANSIT TIME (PTT) TECHNIQUE. A PHOTO-PLETHYSMOGRAPHIC (PPG) CIRCUIT IS DESIGNED TO INTERFACE TO A PERSONAL COMPUTER AND BLUETOOTH AS COMMUNICATION INTERFACE. THE ALGORITHM TO MEASURE PTT FROM R OF GENERATED ELECTROCARDIOGRAM (ECG) TO BASE POINT OF PPG WAVEFORM WAS DEVELOPED WITH GRAPHICAL USER INTERFACES (GUI) TO DISPLAY THE ESTIMATED (SYSTOLIC BLOOD PRESSURE) SBP AND (DIASTOLIC BLOOD PRESSURE) DBP BY OFFLINE AND ONLINE PROCESS.
