With the quickening of the modern rhythm of life, the frequency happening in traffic accident is increasing too, in order to improve the safety that the car runs, this text introduces the mechanically controlled car anticollision alarm system of a one piece. This device combines real time control and data processing function of the one-chip comput
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er with ultrasonic range finding technology, sensor technique, can measure the car in distance and car speed between rear obstacle and car while running, reveal the distance through the digital display device, and is given out the warnings according to the distance situation by the voicing circuit. The principle of ultrasonic range finding is, launch, meet the obstacle reflected back wave through measuring supersonic wave constantly, thus measure and launch supersonic wave and receive the time difference T of the back wave, then find the distance S =C * T/2, among them, C is the ultrasonic wave speed, it is 344m/s to fetch at room temperature. After the velocity of sound is confirmed, so long as measure supersonic wave for round time, can try to get the distance. The measurement of the car speed is realized by Hall`s integrated sensor. Namely, link the input shaft equipped with rotary table of the permanent magnnet with the axis of rotation of the wheel, when the wheel rotates, the rotary table is thereupon turning, at this moment, the permanent magnnet on the rotary table will pass Hall`s integrated sensor, thus get a magnetic signal in the input end of Hall`s integrated sensor, rotate if rotary table ceaselessly, Hall integrated sensor can output rotational speed signal. We can say, the measurement of the car speed is actually the measurement of the frequency to the rotational speed signal. AT89C2051 is a low power...
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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....
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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....
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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....
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