Take precautions against the coefficient is low, the safety is bad, the applicable space is smaller and smaller. With the development of science and technology, people develop already the intersection of door and magnetic, touch-type, the intersection of radar and monitor, the intersection of infrared rays and the intersection of person who monitor and a series of alerting
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automatic telling status, the automaticity of these alarm system is high, the suitability is strong, have intelligent the certain one. But when being Give the alarm can`t notify victim of a crime in time while being systematic mostly. The situation to this, this text has designed a kind of intellectual pronunciation burglar alarming system of remote based on AT89C52, system this find, can steal feeling call number in time, can pay alerting signal call out with Ordinary Telephone Line, notify the victim of a crime in time. It is strong that this system has high, practicability of intelligent procedure, such characteristics as reliable performance is steady. This system is by AT89C52 one chip microcomputer, detection circuit of the signal, reset circuit, telephone number preserve the circuit, detection circuit of the ringing, Simulated Off-Hook and hang electromechanical No. , dial-up circuit and speech circuit to make up, the systematic structured flowchart is shown as in Fig. 1. What DTMF code transmitting line is sent is to preset the telephone number in CPU easy to store by the incoming circuit of the telephone number by users, this number can be set up at will, it can be urban program-controlled telephone, mobile phone, etc. The flow block diagram is shown as in Fig. 2, when the detection circuit of the signal measures someone to intrude upon, namely send out the triggering signal, this signal, as the alarm signal,...
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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