Warm tips: the price of the product is a single price, and the pictures are the positive and negative sides of the product)
Please copy and download the information by yourself: https://pan.baidu.com/s/1b5snBS
NRF24L01 is a monolithic transceiver chip working in 2.4-2.5ghz universal ISM frequency band. The wireless transceiver includes: frequency generator, enhanced schockbursttm mode controller, power amplifier, crystal amplifier, modulator, demodulator, output power channel selection and protocol setting. It can be set through SPI interface with extremely low current consumption, When the transmitting power is 6dbm, the current consumption is 9.0ma, the receiving mode is 12.3ma, and the current consumption mode is lower in power down mode and standby mode.
Support six channel data receiving
1. Low voltage: 1.9 ~ 3.6V low voltage
2. High speed rate: 2Mbps, because the air transmission time is very short, it greatly reduces the collision phenomenon in wireless transmission (software sets 1Mbps or 2Mbps air transmission rate)
3. Multi frequency point: 125 frequency points, meeting the needs of multi-point communication and frequency hopping communication
4. Subminiature: built in 2.4GHz antenna, small size, 15x29mm (including antenna)
5. Low power consumption: when working in response mode, the fast air transmission and start-up time greatly reduce the current consumption.
6. Low application cost: nRF24L01 integrates all high-speed signal processing parts related to RF protocol, such as automatic retransmission of lost data packets and automatic generation of response signals. The SPI interface of nRF24L01 can be connected by hardware SPI interface of single-chip microcomputer or simulated by I / O interface of single-chip microcomputer. The internal FIFO can interface with various high-speed and low-speed microprocessors, which is convenient for using low-cost single-chip microcomputer.
7. Easy to develop: because the link layer is completely integrated in the module, it is very easy to develop. Automatic retransmission function, automatic detection and retransmission of lost data packets, retransmission time and retransmission times can be controlled by software, automatic storage of data packets without receiving response signal, automatic response function, after receiving valid data, the module automatically sends response signal, There is no need to program carrier detection - fixed frequency detection built-in hardware CRC error detection and point to multipoint communication address control, packet transmission error counter and carrier detection function can be used for frequency hopping setting, six receiving channel addresses can be set at the same time, and dip2.54mm spacing interface of receiving channel standard pin can be opened selectively, which is convenient for embedded application
|
Serial number |
name |
direction |
purpose |
|
1 |
VCC |
- |
The power supply must be between 2.0 and 3.6V |
|
2 |
GND |
- |
Ground, connect to power reference ground |
|
3 |
CSN |
input |
The module chip selection pin is used to start a SPI communication |
|
4 |
CE |
input |
Module control pin |
|
5 |
MOSI |
input |
Module SPI data input pin |
|
6 |
SCK |
input |
Module SPI bus clock |
|
7 |
IRQ |
output |
Module interrupt signal output, low level valid |
|
8 |
MISO |
output |
Module SPI data output pin |
VCC pin voltage range is 2.0V ~ 3.6V, can not be outside this range, more than 3.6V will burn the module. The recommended voltage is about 3.3V. In addition to the power supply VCC and ground terminal, the other pins can be directly connected with the common 5V MCU IO port without level conversion. Of course, it is more suitable for 3V MCU.
matters needing attention:
When connecting with port P0 of 51 Series MCU, a 10k pull-up resistor is needed, but it is not necessary to connect with other ports. Other series of microcontrollers, if it is 5V, please refer to the series of microcontroller IO output current size, if more than 10mA, need to series resistance voltage, otherwise easy to burn module! If it is 3.3V, it can be directly connected with the IO port line of nRF24L01 module, such as AVR Series MCU. The SPI rate of the module can support up to 10m. Generally, it is recommended that the SPI rate should be 1m or several hundred K.
Wireless module is electrostatic sensitive device, please pay attention to electrostatic protection when using, especially in dry winter, try not to touch the device on the module, so as to avoid unnecessary damage.
DC power supply with small ripple is recommended for wireless module, and the working voltage is recommended to be 3.3V. The grounding of the module shall be stable and reliable, and the ground wire shall be close to the main ground of the power supply as far as possible. If the switching power supply is used, the decoupling must be strengthened to avoid the ripple and peak pulse of the switching power supply affecting the working characteristics of the module.
The module adopts PCB antenna, which is easy to be affected by external lines. When using, please do not walk under or around the antenna or place devices. If possible, it is best to dig out. The frequency of 2.4G is relatively high, and all kinds of materials have a certain influence. The general plastic has little influence. If there is a metal object, it will have a more obvious influence. At this time, it is recommended to use SMA feeder to connect SMA antenna externally.
