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A sphygmomanometer or blood pressure meter is a device used to measure blood pressure, composed of an inflatable cuff to restrict blood flow, and a mercury or mechanical manometer to measure the pressure. It is always used in conjunction with a means to determine at what pressure blood flow is just starting, and at what pressure it is unimpeded. Manual sphygmomanometers are used in conjunction with a stethoscope.
Figure 1. Block diagram system sphygmomanometer and bpm
Figure 2. Analog to Digital Converter 0804
Figure 3. Driver selenoid valve.