Although there are many different sizes and types of Bluetooth modules in the market, many smart device manufacturers are worried about how to choose the Bluetooth module that suits their products. In fact, the purchase of the Bluetooth module mainly depends on what products are produced and in what scenarios. Below is ten factors affecting the quality of the Bluetooth module for the reference of the majority of smart device manufacturers.
The chip determines the computing power of the Bluetooth module. Without a strong "core", the performance of the Bluetooth module cannot be guaranteed. If you choose a low-power Bluetooth module, the chip is better with Nordic, Ti, etc.
2. Power Consumption
Bluetooth is divided into classic Bluetooth and low-power Bluetooth. The smart device with classic Bluetooth module has frequent disconnection. It needs frequent repeated pairing, and the battery will be exhausted quickly. The smart device with low-power Bluetooth module only needs one. The button cell battery can run for a long time. Therefore, if you are using a battery-powered wireless smart device, it is best to use Bluetooth 5.0/4.2/4.0 low-power Bluetooth module to ensure the endurance of the product.
3. Transfer content
The Bluetooth module can wirelessly transmit data and audio information, and is divided into a Bluetooth data module and a Bluetooth audio module according to functions. The Bluetooth data module is mainly used for data transmission, and is suitable for information and data transmission in public places with large traffic such as exhibitions, stations, hospitals, plazas, etc. The Bluetooth audio module can transmit audio information, which is suitable for use between a Bluetooth mobile phone and a Bluetooth headset.
4. Transmission rate
When selecting the Bluetooth module, it is necessary to know the application of the Bluetooth module and use the data transmission rate required by the working state as the selection standard. After all, the data rate required to transmit high-quality music to the earphone, and the heartbeat monitor The required data rates vary widely.
5. Transmission distance
Device manufacturers need to know what environment their products are used in, and the requirements for wireless transmission distance are not high. For wireless products such as wireless mouse, wireless earphone, remote control and other wireless transmission distance requirements, you can choose a Bluetooth module with a transmission distance of more than 10 meters; products such as decorative RGB lights that require high wireless transmission distance can be selected. Transmission distance of more than 50 meters.
The Bluetooth module has three types: in-line type, surface mount type and serial port adapter. The straight-in type has pin pins for easy pre-welding and is suitable for small batch production. The surface-mount module uses semi-circular pads as pins for large-volume reflow soldering for relatively small carriers; serial Bluetooth adapter for When it is inconvenient to insert Bluetooth into the device, plug it directly into the device's nine-pin serial port and use it when powered up.
See the specific implementation of the interface requirements, the Bluetooth module interface is divided into serial interface, USB interface, digital IO port, analog IO port, SPI programming port and voice interface, each interface can achieve different functions . If it's just data transfer, it's good to use a serial interface (TTL level).
8. Relationship between the master and the slave
The main module can actively search for a Bluetooth module with the same or lower Bluetooth version level as its own; the slave module is passively waiting for other people's search and connection, and the Bluetooth version should be the same or higher than itself. The general smart devices on the market are all selected slave modules, and the main modules are generally used on devices such as mobile phones that can serve as control centers.
Different products have different antenna requirements. Currently, the most commonly used antennas for Bluetooth modules are PCB antennas, ceramic antennas and IPEX external antennas. If they are placed inside a metal shelter, Bluetooth modules with IPEX external antennas are generally selected.
Price is the most concerned issue for many smart device manufacturers. Feasycom has been cultivating many years in the field of low-power Bluetooth modules. Its own factory with ISO9001 certification. The stocking cycle is short and can quickly respond to the various equipment manufacturers’ kind of demand. The company's existing supply chain and production line can achieve significant price advantages, ensuring that equipment manufacturers can use low-cost, cost-effective low-power Bluetooth modules.
In addition to the above ten precautions, device manufacturers need to know the size, receiving sensitivity, transmit power, Flash, RAM, etc. of the Bluetooth module when purchasing the Bluetooth module.