In modern electronic products, electronic music doorbells are more and more popular in modern homes because they have the advantages of pleasing to the ear, low price, and low power consumption. This graduation project is based on the "Ding Dong" doorbell of the single-chip microcomputer. The output frequency is controlled by the single-chip microcomputer, and the audio power amplifier LM386 is amplified to the speaker, so that it is no longer a monotonous prompt tone, but an extraordinary pop music melody. When a guest comes, press the button and the doorbell will play beautiful electronic music. The electronic code lock is an electronic product that is different from the traditional mechanical lock and can control the work of the circuit or chip through the input of the code, and then control the closing of the mechanical switch, thereby completing the unlocking and locking tasks. It has many categories, both simple circuit products and products based on single-chip microcomputer chips. Nowadays, the widely used electronic password lock is realized by compiling the program with the control chip as the core. Its performance and safety far exceed mechanical locks. Its characteristics are as follows: (1) The confidentiality is good, the amount of encoding is much larger than that of the marble lock, and the random unlocking success rate is almost zero. (2) The password is variable, and the user can change the password at any time to prevent the password from being stolen, and at the same time, it can also prevent the security level of the lock from dropping due to personnel replacement. (3) Error code input protection. When the password is entered incorrectly for many times, the alarm system will automatically start. (4) No moving parts, no wear and long life. (5) Good flexibility in use, unlike mechanical locks, you must wear a key to unlock. (6) The operation of the electronic code lock is simple and easy to operate, and you can learn it immediately. Therefore, the doorbell is further combined with the electronic code lock, and a new generation of multifunctional voice doorbell appears. In recent years, with the continuous heating up of intelligent buildings in the market, the doorbell system has been accepted by businesses and users as an integral part of intelligent offices and intelligent residential communities. People gradually became accustomed to using the doorbell system to replace the traditional iron key to manage various access doors, which prompted a breakthrough in the doorbell system. From the previous "dingdong" doorbell, it is cheap, reliable, low power consumption, and easy to install; then there is a music doorbell. Pressing is no longer a "dingdong" sound, but sweet music, so Guests can wait patiently; now the doorbell has appeared with a video doorbell, and there are video machines both inside and outside the house, and you can talk. Through the conversation, the owner can press the knob in the back room to open the door, so that the owner does not need to come out to open the door in person ,very convenient. At present, door locks are mainly old-fashioned mechanical locks. Such lock keys are also easy to lose. People need to carry multiple keys, which is inconvenient to use. Moreover, the security of the lock is greatly reduced after the key is lost. In response to the inconvenience caused to people by these mechanical locks, in order to meet people's application requirements for locks and increase the security of the lock, a combination lock with a password instead of a key was born. Its arrival has brought great convenience and safety to people's lives, and has great market development prospects. With the further development of electronic components, many types of electronic code locks have been developed, and their functions have gradually become stronger. They are more convenient to use and have stronger protection. From the previous development of single code input to the current code plus The components with induction function realize double electronic encryption. The user only has one of the password or the electronic key and cannot open the lock. Due to the development of electronic components and the increase in people’s requirements for confidentiality, more Electronic combination lock. Many electronic code locks have come out one after another for safety and convenience. However, the characteristics of this type of product are that it is effective for specific valid cards, fingerprints or voices, and cannot realize remote control. It can only be applied to boxes, cabinets, rooms, etc. that require high confidentiality and are for personal use. From this we can see that the combined use of electronics Information is the future development trend of electronic code locks. The emergence and mass use of microcomputers has brought human society into a new era, in which single-chip microcomputers (single-chip microcomputers for short) play a very important role. Due to the powerful control function, flexible use, small size, high reliability, high cost performance, and productization of single-chip microcomputers, in recent years, it has been used in intelligent instrumentation, mechatronics, real-time control, distributed multi-machine systems, household electrical It has been widely used in various fields, and has played an important role in promoting the technological transformation and product upgrading of various industries, and has had a profound impact on the improvement of people's quality of life. Traditional doorbells are all ding-dong sounds, which have fewer functions, are weaker, and have a complex structure. It can't meet the needs of this rapidly developing society at all. In the future, doorbells will be smarter and more humane to meet the various needs of mankind. Use the microphone to collect voice and the camera to collect image signals, and convert the collected analog signals into digital signals. The main processor compresses and enhances voice and digital image signals, and then transmits the compressed signal through a wireless signal transmitter; transmits control signals generated by peripherals such as doorbell buttons through the wireless signal transmitter; The wireless signal receiver receives the wireless voice signal transmitted from the indoor unit, and the main processor decompresses the received voice signal, then converts the digital-to-analog signal into an analog signal, and plays it through the speaker. The wireless signal receiver receives the wireless voice or video signal from the outdoor unit. The main processor performs redundancy and decoding processing on the received signal, and then displays the decoded video signal on the display screen, and the decoded voice signal is processed by D/ A is converted into an analog signal and played through the speaker; the control signals generated by the various peripherals of the indoor unit, such as calling and unlocking buttons, are transmitted through the wireless signal transmitter; the microphone is used to collect the voice signal and the collected analog signal Perform analog-to-digital conversion to digital signals, and the main processor compresses the voice signal, and then transmits the compressed signal through a wireless signal transmitter. In addition, if you want to enhance the transmitted and received signals of the wireless doorbell, because the strength of the signal is related to the power of the battery, you can get a charger to connect to the doorbell, plug in the power supply and supply power directly, and buy a better quality Rechargeable battery. Accessories,Motorola Two Way Radios,Motorola Talkabout Radios,Motorola Handheld Radio Guangzhou Etmy Technology Co., Ltd. , https://www.gzdigitaltalkie.com
Introduction to wireless voice doorbell