The application of the Internet can improve the shortcomings of the traditional piano teaching mode, avoid the risk of epidemic spread, and reduce the cost of piano education. In major colleges and universities, online piano teaching has become an important teaching method since the epidemic. Teachers can teach and students can learn through the Internet, which means that remote wireless network communication technology needs to be applied in the teaching process. The long-distance wireless network communication technology is a technical means to monitor and control the object at a long distance, and it is a remote-control system interacted by computer technology, automatic control technology and communication technology [8, 9]. Long-distance wireless network communication technology has been widely and profoundly applied in many fields. According to the available literature, the amount of literature expression in the field of remote wireless network communication technology is increasing year by year (see Figure 1). Lv et al. [10] designed a smart city environmental monitoring system based on the ZigBee wireless network to complete the real-time collection of urban environmental information. Pei et al. [11] used a stretchable, self-healing, and tissue-adhesive zwitterionic hydrogel as a strain sensor for wirelessly monitoring organ motion to monitor human motion. Catarinucci et al. [12] designed and developed wireless network communication awareness architecture for smart medical systems. Amiri and Gunduz [13] conducted federated machine learning through wireless network edge research, considering bandwidth-limited fading multiple access channels (MACs) from wireless devices to PSs, and they proposed various techniques to implement distributed stochastic gradient descent (DSGD) through this shared noisy wireless channel. Liu et al. [14] proposed that the use of unmanned aerial vehicles (UAVs) can be used as air base stations to enhance the coverage and performance of communication networks in various scenarios, such as emergency communication and network access in remote areas. Zhang and Wang [15] designed a remote-control device based on a wireless sensor network to remotely control the growth state of crops, design an intelligent detection application of farmland information, and improve the efficiency of agricultural information management. Liu et al. [16] introduced the introduction of wireless sensor networks into medical care systems and proposed a wireless sensor network-based medical imaging system to dynamically track the pathological development of the patient, thereby ensuring timely diagnosis and treatment. Yang et al. [17] constructed an embedded remote working condition monitoring system based on an embedded development board and wireless bridge communication technology. The system combines the V4L2 (Linux2 video) programming framework provided by Linux, and transplants the collection and transmission programme of working condition data and image data to the development board. The above applications reflect the feasibility and effectiveness of remote wireless network communication technology in different fields and illustrate that under the current trend of the Internet of Things, with the continuous improvement of algorithms and the upgrading of sensing equipment, the intervention of big data platforms, long-distance wireless network communication technology is popularising in all aspects and fields.
Judging from the current communication technology, due to the different communication environments and needs of each part of the online piano teaching in colleges and universities, the communication technology adopted will also be different, and the relevant software and hardware technical requirements and choices are also different [18, 19, 20]. To realise the complete online piano teaching communication, the system communication can be divided into two modules: (1) module 1 is the sensor signal transmission with STM32 microcontroller as the core and (2) module 2 is the information between the teacher terminal and the user terminal and the local piano teaching system Interactive communication. In the needs of sensor signal transmission, the current technical direction can be roughly divided into wired and wireless communications. Although wired communication runs stably, the complex wiring operation not only affects the appearance but also is not easy to maintain and care. Therefore, we abandoned the wired communication method and switched to the construction of the underlying structure of the wireless communication method. At present, the most used wireless communication technologies on the market include Wi-Fi technology, ZigBee technology, Bluetooth technology and NFC technology [21, 22, 23, 24]. Among them, Wi-Fi technology has the advantages of wide signal coverage and fast signal transmission, but it may have an impact on piano teaching due to network fluctuations, especially in live teaching. ZigBee technology has the advantages of low cost and low power consumption, but the transmission rate is slow. Bluetooth technology has high security, but it has poor fault tolerance in embedded development and poor compatibility with various technical architectures. NFC technology also has high security, but its transmission distance is too short. Therefore, combined with the needs of online piano teaching and the characteristics of signal transmission at the bottom perception layer, we have selected two communication methods to ensure the safety and effectiveness of information interaction. Among them, ZigBee technology is used as the main communication method of the signal sensing layer, which can meet the data volume of the bottom signal sensing layer. Wi-Fi technology is used as an auxiliary communication method to meet the communication detection function requirements due to the addition of a computer interface in the design.
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