Bluetooth distance is too short, you can:
1. Antenna adjustment The gain of the wireless communication system is equal to the sum of the transmit power of the wireless module and the gain of the antenna, so the gain of the antenna has a great relationship with the transmission distance of the wireless module. In the case of module and antenna matching, the higher the gain of the antenna, the longer the transmission distance of the wireless Bluetooth module.
2. Transmission path Wireless data communication is realized through the linear transmission of wireless electromagnetic waves in the air, so the blockage of obstacles has a great impact on wireless transmission, especially the obstacles of metal objects, not only block the wireless transmission signal, not only block the wireless transmission signal, but also absorb and reflect the electromagnetic wave signal, reducing the radiation efficiency. Therefore, the biggest obstacle to wireless transmission is actually metal, houses, trees, grass, sea level and other objects that can play a shielding role.
3, transmitter and receiver adjustment
First of all, you need to consider the application scenario and determine the distance that needs to be transmitted. If it is necessary to transmit over a long distance, consider whether the wireless module has a power amplifier (PA) and a low noise amplifier (LNA), otherwise it cannot achieve wireless transmission over a long distance.
4. Working frequency adjustment
Wireless channels are relatively crowded, especially in the ISM band. During the actual installation of communication equipment, a spectrum survey of the local electromagnetic environment can be carried out, and a relatively \"clean\" frequency point can be selected to avoid unnecessary interference. At the same time, frequency planning should be carried out in strict compliance with local laws and regulations. CSR8811 remote Bluetooth module
Communication distance is a comprehensive index of wireless module, which is affected by many conditions, factors and parameters. In general, the wireless transceiver module should achieve the ideal wireless transmission effect:
Do a good job in the early planning and selection, mainly for the power supply and the wireless module to be used.
The placement points of the high antenna or the offset antenna at both ends of the transceiver are set up to reduce the occlusion of obstacles, reduce the attenuation of electromagnetic wave signals, and reduce the blind area of wireless signals.