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Introduction of several 433M / 2.4G wireless data transmission module circuits

Source: unknown Editor: admin Time: April 28, 2020 02:34

Introduction of several 2.4G wireless data transmission modules
 

Wireless data transmission is divided into low-speed data transmission module and high-speed data transmission module according to transmission rate. The carrier frequency used by low-speed data transmission module is low, generally in 315MHz, 433MHz and 915MHz frequency bands, so the maximum transmission rate is generally no more than 150kb / s.
 

However, these wireless devices used in UHF band still have certain penetration and diffraction capabilities, and the transmission distance is relatively far, up to hundreds of meters. This is its advantage, but it also has its fixed disadvantages. Because of the low working frequency and large industrial interference, a large number of automobile wireless remote control (locks) use this frequency band, the interference is relatively serious, which is serious in technology It restricts the speed of data transmission. In order to improve the data transmission rate, it is necessary to avoid the band with complex interference environment. Technicians have opened up 2.4GHz frequency band.    
  

High speed transmission module generally considers that the transmission rate is higher than 500kb / s, which generally uses carrier frequency of 2.4GHz or higher. In this frequency band, because electromagnetic wave is not easy to penetrate or diffract, there is little interference, and the space electromagnetic environment is clean, which provides the basis for high-speed data transmission. However, due to the high frequency, the radio waves in this band have no penetration or diffraction ability, and the propagation is limited to the line of sight distance, which can only achieve the wireless transmission distance of about tens of meters.
 

The following several commonly used 2.4GHz wireless data transmission module for a brief introduction.     
 

NRF2401 wireless data transmission module
 

Nrf2401ag wireless data transmission module is the product of Nordic company, the working frequency is 2.4GHz, With 125 channels and GFSK modulation, the data transmission rate can reach 1MB / s, which is better than Bluetooth transmission. NRF2401 has built-in CRC error correction protocol and hardware circuit. Parameters such as working frequency and transmitting power can be programmed by software. The extremely low working voltage is 1.9v-3.6v, and the power consumption is also very low. Each chip can be programmed by software up to 40 addresses, and only the receiver receives the same data Address can be used for data communication and an interrupt request can be provided at the same time. Nrf2401ag series has a module with only transmitting function. The chip used is nrf2402g. It can be used in the situation of only sending.
 

NRF24L01 wireless data transmission module
 

NRF24L01 wireless data transmission module is an upgrade product of Nordic company based on nrf2401ag. It has 130us fast switching and wake-up time. Like bk2411, the unique multiceiver MT hardware provides the function of six receivers at the same time. In addition, the nrf2401ag speed of 1MB / S is increased to 2Mb / s, It makes high-quality VolP possible, which is higher in the same class of products. NRF24L01 also improves the low-power characteristics, which is especially suitable for small capacity button battery powered applications. The whole solution includes link layer and multiceiver function, which provides more functions and lower power consumption than nrf2401ag. Compared with the current Bluetooth technology, nRF24L01 provides higher power consumption At the same time, it needs very little power consumption
 

Bk2411 wireless data transmission module
 

Bk2411 wireless data transmission module is the product of Shanghai Botong company. It adopts FSK and GFSK modulation mode, has 1MB / s or 2Mb / s transmission rate, and programmable output power: - 35dB, - 15dB, 0dB, 5dB, etc. it has six data channels, which can form a 1:6 star network, and each data channel has 32 bytes FIFO (first in first out buffer), The disadvantage is that the power control is weaker than other modules, the software initialization is a little more complex, and the bit error rate is slightly higher at the same distance, but it has relatively high cost performance, so it has been widely used
 

CC2500 wireless data transmission module
  

CC2500 wireless data transmission module is a product of TI company in the United States. It has ook / ask / 2-fsk / MSK and other modulation modes. Different working modes can be selected in different environments to improve work efficiency. The output power of CC2500 is higher than other data transmission modules, up to 1dbm. It supports multiple packet connection quality indication, and has a separate 64 byte Rx, TX data FIFO (first in first out buffer) can send or receive larger data packets at one time, and integrates various error correction evaluation and indication circuits in the chip. It belongs to a more rigorous data transmission module. Its disadvantage is that the data transmission rate can not compare with nRF2401, but it can also reach 500kb / s. This is enough for general application