Nowadays, with the high development of electronic technology, treasure detectors are applied to various industries and play a very important role in our lives. Our attention to security issues has led to the rapid development of treasure detectors, not only widely used in security testing, but also used in a variety of testing. The treasure detector system is mainly composed of AT89S52, ADC0809 and so on. The principle is that the oscillating current is generated by the oscillation circuit, a changing magnetic field is formed in the coil, the change of magnetic field intensity is induced by the Hall element, and then the data is processed and transmitted to the microcontroller, which connects the display part with the alarm part. Through networking, the treasure detector can be remotely controlled by us, and can even run fully automatically without control, which can reduce casualties in many dangerous places and play an important role in real life.

First, the treasure detector control system hardware circuit design.

The control hardware circuit mainly includes the design of oscillation circuit, amplifier circuit, peak detection circuit, signal processing and alarm display circuit. Coil oscillation circuit. The pulse frequency is 24KHz, the duty cycle is 2/3.

2. Amplification and peak detection circuit. Hall element output voltage variable is relatively small, need to first amplify the voltage, OH49E element output voltage is amplified by the amplifier circuit. After the above processing, the voltage signal is input from port 1 to the ADC0809, and the 8-bit digital signal exchanged ADC0809 is input to the P1 pin of the microcontroller AT89S52, which is further processed by the microcontroller.

3. Alarm circuit. The alarm part of the treasure detector is essential. There are many ways to alarm this product on the market. In this system, we use a buzzer and light-emitting diode display alarm circuit. The input signal is the received single-chip signal. The current limiting resistor in the alarm circuit should be appropriate, not only to protect the circuit, but also to ensure that the current in the circuit is not too small to make the alarm inconspicuous.

4. Display circuit. In order to use conveniently, the system also designs the display part. The output of the AT89S52 is connected to a four-digit digital tube. The output port P0 determines the four digits, and the output port P2 determines the on-off of the eight segments on each digit. The voltage values in the circuit are shown above.

Software Design of 2. Treasure Detector Control System

In the rapid development of science and technology today, software shows a very important position. Software can better simplify the hardware circuit of the system, thereby improving the stability of the treasure detector system. The data collected by the hardware is digital, and the following is the specific design of the software. From the figure below, we can intuitively see the functions of the front-end software. It guides the signal processing of the whole system. When the metal detection system detects metal, it can alarm in time.

3. Conclusion

The treasure detector system has met the requirements, can detect nearby metals, and can let us know the detection results intuitively through the alarm device. In real life, it also has a certain practicality, overall more convenient, easy to carry and use. The shortcomings of this treasure detector system are also obvious. Its structure is a traditional way, which is very different from the way used today. It cannot detect the size, weight, shape, etc. of metal. There is still much room for improvement in these areas.