Product Features:
This module adopts domestic RF bonding chip BK2425, which integrates all the high-speed signal processing parts related to RF protocol internally, and it is very easy to develop because the link layer is fully integrated on the module. Automatic detection and automatic retransmission of lost packets, retransmission time and number of retransmissions can be controlled by software, automatic storage of packets that do not receive an answer signal; after receiving valid data, the module automatically sends an answer signal without separate programming; carrier detection - fixed frequency detection, built-in hardware CRC error checking and point-to-multipoint communication address control packet transmission error counters and Carrier detection function can be used for frequency hopping settings can be set simultaneously six receiving channel address, can selectively open the receiving channel.BK2425's SPI interface can be connected using the hardware SPI port of the microcontroller or simulated using the microcontroller I/O port, internal FIFO can be interfaced with a variety of high and low-speed microprocessor interface to facilitate the use of low-cost microcontrollers.

Product Parameters:
- On-board 2.4G PCB antenna, ISM band, 2.54mm pin DIP8 package, compact size, easy to embedded applications.
- Support six channels of data reception (a pair of six)
- Support GFSK modulation
- Support 2Mbps/1Mbps/250Kbps data rate, can be set to different transmit power.
- Multi-frequency: meet the needs of multi-point communication and frequency hopping communication 2400MHz~2527MHz, 1MHz frequency hopping step.
- Internal integrated high PSRR LDO
- Wide supply voltage range: 1.9~3.6V, 3.3V typical
- Average transmit current as low as 18mA (4dBm)
- Receive sensitivity: -96dBm@250kbps
- Transmit power up to 4dBm
- 4-wire SPI interface with rates up to 8MHz
- Internal packet processing engine
- Hardware interrupt output for transmit and receive data
- Operating temperature: -20℃~85
- Best transmission distance: less than 120 metres (250kbp open environment without obstruction and no electromagnetic interference) Reliable distance is recommended to be used within 30%-50%.

Instructions for use:
The voltage range of the VCC pin is between 2.0V~3.6V, it can't be outside this range, more than 3.6V will burn the module. The recommended voltage is around 3.3V. Except for the power supply VCC and the ground terminal, the rest of the pins can be directly connected to the IO port of an ordinary 5V microcontroller without level conversion. Of course, it is more suitable for 3V microcontrollers.

Caution:
When connecting with the P0 port of 51 series microcontrollers, it is necessary to add a 10K pull-up resistor, and the other ports do not need to be connected. Other series of microcontroller, if it is 5V, please refer to the series of microcontroller IO port output current size, if more than 10mA, you need to series resistor voltage divider, otherwise it is easy to burn the module! If it is 3.3V, it can be directly connected with the IO port line of nRF24l01 module, such as AVR series microcontroller. The SPI rate of the module can only support up to 8M, it is generally recommended that the SPI rate of 1M or a few hundred K can be.
The wireless module is a static sensitive device, please pay attention to the static protection when using, especially in dry winter, try not to touch the device on the module, so as not to cause unnecessary damage.
Wireless module is recommended to use a DC power supply with low ripple, and the working voltage is recommended to be 3.3V. The grounding of the module should be stable and reliable, and the earth wire should be as close as possible to the main ground of the power supply. If using switching power supply, must strengthen the decoupling, so as to avoid the ripple and spike pulse of switching power supply affect the working characteristics of the module.
The module adopts PCB antenna, this antenna is easily affected by the external lines, when using this antenna, please do not walk under the antenna and around the lines or devices, if possible, it is best to dig empty. 2.4G frequency is relatively high, a variety of materials have a certain impact, the general impact of plastic is not significant, such as metal objects will have a more obvious impact, it is recommended to use SMA feeder to external SMA antenna.