The sphygmomanometer can roughly be divided into two kinds at present: First, mercury sphygmomanometer, steady for number value advantage its, shortcoming its operate by oneself for unable one, must be professional the medical personnel operates, and the naked eye observational error is maximal, subjectivity is strong, the volume is not very much more portable. Second, electronic formula sphygmomanometer
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, its advantage is: It is simple and easy to use, but a person operates alone; The measured value is easy to record, the volume is light and handy and portable. The electronic formula sphygmomanometer has possessed a great deal of advantages, is well received by ordinary family more and more. This text introduction regards MSP430F449 as and controls the core, complement it by the simulation signal processing circuit and LCD revealing, voice prompt between pressure capsule and MCU of the Model BP01, realize the design of the home electronic blood manometer. The concept of blood pressure is the pressure when the blood flows through the vessel wall. The blood coming out by the heart, need thrust, could make a detour in a circle of body, the heart is through incessant shrink, relaxing, advance the send out of blood. There are two kinds of blood pressure, first, systolic pressure: It is will systaltic to get to blood blood pressure blood vessel measure to be, another the diastolic pressure: It is a heart at the pressure that nonshrink measures. When the pressure of the cuff is equal to blood pressure, the blood be able to circulate and produce the so-called cuff sound while beginning, shown as systolic pressure at this time, has recorded since this moment, the time until the final cuff sound disappears, record this point to get the diastolic pressure. The system block diagram is shown as in Fig. 1. The system is from...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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