What is the design of the MCU for the audio repeller?

Last Update Time: 2020-05-29 10:43:24


      For a long time, mice have caused great troubles for family cattle and agricultural production. However, existing mechanical methods, chemical drugs, biological control, etc., have obvious shortcomings. The defect of mechanical rodent control is that after receiving such equipment damage, the mouse will keep a deep memory of the instrument and avoid the injury from happening again. For the long-term use of chemical drugs, it will not only cause environmental pollution, but also have certain harm to the human body. For biological control, the control is difficult to grasp, so the effect is not ideal. Therefore, a more scientific, environmentally friendly and effective product is needed to achieve the repeller function. The existing electronic repeller products on the market have complicated circuit design and high cost. Therefore, an audio repeller based on the 51-type single-chip microcomputer has emerged.


      1 Overall design of the audio repeller

      The design of the repeller is generally divided into four modules, namely, a power module, a sensing module, a control module, and an audio module. The power module provides +5V DC power to the entire system to support the overall operation of the repeller.

      Pyroelectric infrared sensing modules are used to sense the invasion of rodents. The control module uses 51 type MCU programming for clock control. The audio module produces a meowing sound to scare the rodents, and the ultrasound causes the rodents to have irritability, discomfort and other symptoms, and under the dual action, the rattling effect is achieved.

      In short, when the mouse intrusion is sensed, the MCU controls the audio module to sound to achieve the purpose of smashing.

      2 system design of audio repeller


      2.1 Audio Module Design

     The design of the audio module is divided into two parts: the cat sounding module and the ultrasonic module.

     The cat called the sound module is based on the principle of bionics, that is, by studying some characteristics of the organism, it develops instruments and machinery similar to the structure and function of biological organs. In the design of the repeller, the frequency of the buzzer is adjusted, the sound of the cat is simulated, and the rodents are scared to achieve the effect of repelling.

      2.2 Control module design

      The control module is implemented using a 51-chip microcontroller.

      Program function: When the mouse intrusion is detected, a high level is generated, and the MCU controls the audio module to sound. In this program, the time delay is set to 5 seconds, after which the MCU resets to a low level.


      2.3 Induction module design

     The sensing module is implemented according to the pyroelectric infrared sensing principle.

Since the rodent is a warm-blooded animal, the body temperature is usually about 37 ° C, so that infrared rays having a specific wavelength of about 10 μm can be emitted. When the mouse's activity enters the detection zone, its temperature is different from the ambient temperature. Therefore, about 10 μm of infrared light emitted by the mouse is enhanced by the Fresnel lens filter and concentrated on the infrared induction source (pyroelectric element). When the inductive source receives the infrared radiation, it will lose the charge balance and release the charge outward, thereby generating a temperature difference ΔT and outputting ΔT to the peripheral circuit, and the subsequent circuit can generate an alarm signal after being detected and processed. Pyroelectric infrared sensors have a working range of 10-20m and can operate normally from -10°C to +40°C.




      Ultrasonic waves of a certain intensity will cause fever of the body tissues; when the frequency is higher, the fever will become more and more powerful, causing the water molecules in the body to be burnt, and the surrounding tissues to be destroyed, which is dangerous for a long time. Therefore, the high-power and high-intensity ultrasonic waves continue to act on the rodents, which may cause discomfort and even death in the rodents. Therefore, the use of ultrasound to cause discomfort in the physiological tissues of rats to achieve the purpose of smashing.


       3 Advantages and prospects of audio repeller

      (1) Compared with the traditional repeller method, the repeller is more scientific and environmentally friendly, and the long-term use will not cause damage to the ecological environment and the human body itself.

      (2) For the existing electronic repeller equipment on the market, the circuit design of the repeller is simple, the process is simple, and the production cost is effectively reduced.

      (3) The principle of pyroelectric infrared sensing used in this product will not emit ultrasonic waves and meows at any time. Only when the mouse is invaded, will it be vocalized and will not cause additional sound interference. Production and living.

      (4) A wide range of applications. The repeller can be placed in different places such as kitchens and warehouses according to the need to prevent the area and location of rodent invasion, and is widely used in family life and agricultural production.


      4 Conclusion

      This paper designs an audio repeller based on 51-type single-chip microcomputer, which overcomes the shortcomings of the traditional method and creates a more scientific, environmentally friendly and convenient repeller atmosphere. After on-site debugging and testing, simulating the live activities of the mice, when the designed repeller was opened, the mice showed obvious symptoms such as irritability and uneasiness. After many experiments, it proved that this repeller has a good repeller ability.


If you want to know more, our website has product specifications for the audio repeller, you can go to ALLICDATA ELECTRONICS LIMITED to get more information