There are more and more wireless modules on the market, but they can be roughly divided into three categories:
1. ASK superheterodyne module: we can be used as a simple remote control and data transmission;
2. Wireless transceiver module: It mainly uses a single-chip microcomputer to control the wireless module to send and receive data. The commonly used modulation modes are FSK and GFSK;
3. The wireless data transmission module mainly uses serial port tools to receive and send data, which is easy for customers to use. Wireless modules on the market are now widely used, with frequencies of 230MHz, 315MHz, 433MHz, 490MHz, 868MHz, 915MHz, 2.4GHz, etc.
This article mainly introduces the feature comparison of 433M and 2.4G wireless modules. First of all, we need to know that the frequency range of 433M is 433.05~434.79MHz, while the frequency range of 2.4G is 2.4~2.5GHz. They are all license-free ISM (industrial, scientific and medical) open frequency bands in China. It is not necessary to use these frequency bands. Need to apply for authorization from the local radio management, so these two bands have been widely used.
What is 433MHz?
The 433MHz wireless transceiver module uses high-frequency radio frequency technology, so it is also called RF433 radio frequency small module. It is composed of a single IC radio frequency front end produced by all-digital technology and ATMEL's AVR single-chip microcomputer. It can transmit data signals at a high speed, and it can package, check and correct the data transmitted wirelessly. The components are all industrial-grade standards, stable and reliable in operation, small in size and easy to install. It is suitable for a wide range of fields such as security alarm, wireless automatic meter reading, home and industrial automation, remote remote control, wireless data transmission and so on.
433M has high receiving sensitivity and good diffraction performance. We generally use 433MHz products to implement master-slave communication systems. In this way, the master-slave topology is actually a smart home, which has the advantages of simple network structure, easy layout, and short power-on time. 433MHz and 470MHz are now widely used in the smart meter reading industry.
Application of 433MHz in smart home
1. Lighting Control
The wireless radio frequency lighting control system is composed of a smart panel switch and a dimmer. The dimmer is used to send and receive command signals. The commands are transmitted by radio instead of the home's power line. Each panel switch is equipped with a different remote control identification code. These codes use 19-bit recognition technology to enable the receiver to accurately identify each command. Even if the neighbors use it at the same time, there will never be transmission errors due to interference from their remote control.
2. Wireless Smart Socket
The wireless smart socket series mainly use wireless radio frequency technology to realize the remote control of the power of non-remote control appliances (such as water heaters, electric fans, etc.), which not only adds the function of wireless remote control to these appliances, but also saves energy to the greatest extent and ensures safety.
3. Information appliance control
Information appliance control is a multifunctional remote control system that integrates infrared control and wireless control. It can control up to five infrared devices (such as: TV, air conditioner, DVD, power amplifier, curtains, etc.) and wireless devices such as switches and sockets. The information appliance controller can transfer the codes of the remote control of ordinary infrared appliances through learning to replace the original appliance remote control. At the same time, it is also a wireless remote control, which can transmit control signals with a frequency of 433.92MHz, so it can control smart switches, smart sockets and wireless infrared transponders in this frequency band.
The 2.4GHz application point is a networking protocol developed based on its high-speed transmission rate.
All in all, we can choose modules with different frequencies according to different networking methods. If the networking method is relatively easy and the requirements are relatively simple, one master has multiple slaves, the cost is low, and the use environment is more complex, we can use a 433MHz wireless module; relatively speaking, if the network topology is more complex and functional A wide range of products with strong network robustness, low power consumption requirements, simple development, and 2.4GHz networking function will be your best choice.
Post time: Jun-05-2021