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Portable Digital Blood Pressure Monitor PowerPoint Presentation

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Slide 1 - Portable Digital Blood Pressure Monitor Introduction: Our final project is to design and build a portable blood pressure monitor device that can measure a user's blood pressures and heart rate through an inflatable hand cuff. The device is consisted of three main parts: external hardwares (such as cuff, motor, valve, and lcd), analog circuit, and microcontroller. The anolog circuit converts the pressure value inside the cuff into readable and usable analog waveforms. The MCU samples the waveforms and performs A/D convertion so that further calculations can be made. In addition, the MCU also controls the operation of the devices such as the button and lcd display. Since we have the word 'portable' in our title, for sure all of the components are put together in one package which allows a user to take it anywhere and perform a measurement whenever and wherever he/she wants.  It is undeniable that nowadays people are more aware of the health conditions. One of the most widely used methods to test the health conditions of an individual is to measure his/her blood pressures and heart rate. We, as ones of those who are concerned about their health, decided to work on this subject matter because we would like to build something that is useful and useable in real life.
Slide 2 - How blood pressures are measured Usually when the doctor measures the patient's blood pressure, he will pump the air into the cuff and use the stethoscope to listen to the sounds of the blood in the artery of the patient's arm. At the start, the air is pumped to be above the systolic value. At this point, the doctor will hear nothing through the stethoscope. After the pressure is released gradually, at some point, the doctor will begin to hear the sound of the heart beats. At this point, the pressure in the cuff corresponds to the systolic pressure. After the pressure decreases further, the doctor will continue hearing the sound (with different characteristics). And at some point, the sounds will begin to disappear. At this point, the pressure in the cuff corresponds to the diastolic pressure.
Slide 3 - The air will be pumped into the cuff to be around 20 mmHg above average systolic pressure (about 120 mmHg for an average). After that the air will be slowly released from the cuff causing the pressure in the cuff to decrease. As the cuff is slowly deflated, we will be measuring the tiny oscillation in the air pressure of the arm cuff. The systolic pressure will be the pressure at which the pulsation starts to occur. We will use the MCU to detect the point at which this oscillation happens and then record the pressure in the cuff. Then the pressure in the cuff will decrease further. The diastolic pressure will be taken at the point in which the oscillation starts to disappear.
Slide 4 - Hardware Diagram
Slide 5 - Hardware Diagram
Slide 6 - NOTES The output voltage of the pressure sensor will be proportional to the difference between the pressure in the cuff and the air pressure in the room. The output voltage from the pressure sensor is very small (in mV),so we used a DC Amplifier (AD620) that amplifies according this equation RG=49.4KOhm/(G-1).
Slide 7 - NOTES We used a Band-Pass filter to red of the DC voltage and amplify the AC voltage. We used an AC coupling stage to provide the DC bias level. Given this bias level, it is easier for us to process the AC signal using the on-chip ADC in the microcontroller.
Slide 8 - Software Flowchart
Slide 9 - ppt slide no 9 content not found
 

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