hello,
I am making a project on blood pressure measurement project.
actually I have to measure two pressures 1.systolic and 2.diastolic both can be measured as follows...
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.
My question is how to recognize the start of variation of signal in the controller programming.?
means which will be the best way to know the heartbeats are now starts flowing under the cuff.?
For that I am using MPXV5050 sensor for sensing pressure..