With the advancement of electronic technology, the toy market has entered an era of interactive experience, competition and electronic intelligence. The interactive experience of toys has become a key factor in product innovation. Under such a background, the development of remote-controlled toys is endless, and all kinds of remote control toys for airplanes, tanks and submarines are available. The continuous development of these toys has brought a lot of profit and commercial value to the factory business of the game industry.
The development of remote control toys is inseparable from wireless transceivers. The E01-2G4M13S wireless transceiver module of Chengdu Ebyte Electronic Technology Co., Ltd. was developed using the original nRF24L01P. Built-in power amplifier (PA) and low noise amplifier (LNA), the overall communication stability is greatly improved. The size of the module, with its own PCB antenna, patch package is very convenient for product integration, widely used in remote control toy products.
1.Introduction to E01-2G4M13S
E012G4M13S has a maximum transmission power of 20mW. The low energy consumption satisfies the battery power supply and greatly expands the communication distance. In an ideal state, it can reach 1.2km. Support global license-free ISM 2.4GHz frequency band, support 2Mbps, 1Mbps and 250kbps airspeed, 125 communication channels, to meet the needs of multi-point communication, packet, frequency hopping and other applications. Connected to the MCU through the SPI interface, the rate is 0 ~ 10Mbps, professional RF shield, anti-interference, anti-static, industrial-grade standard design, support for long-term use from -40 to +85 °C.
2.How to operate
A.Circuit
B.hardware design
1、It is recommended to use the DC stabilized power supply to supply power to the module. The power supply ripple coefficient is as small as possible, and the module needs to be reliably grounded.
2、Please pay attention to the correct connection of the positive and negative poles of the power supply. If the reverse connection is made, the module may be permanently damaged.
3、Please check the power supply to ensure that the module is permanently damaged if it exceeds the maximum value.
4、Please check the stability of the power supply, and the voltage cannot be fluctuated frequently;
5、When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the margin, and the whole machine is beneficial for long-term stable operation;
6、The module should be as far away as possible from the power supply, transformers, high-frequency wiring and other parts with large electromagnetic interference;
7、High-frequency digital traces, high-frequency analog traces, and power traces must be avoided under the module. If it is necessary to pass through the module, assume that the module is soldered to the Top Layer, and the copper is applied to the Top Layer of the module contact part. And well grounded), must be close to the digital part of the module and routed in the Bottom Layer;
8、Assuming that the module is soldered or placed in the Top Layer, it is also wrong to randomly route the Bottom Layer or other layers, which will affect the spurs and receiving sensitivity of the module to varying degrees;
9、It is assumed that there are devices with large electromagnetic interference around the module that will greatly affect the performance of the module. It is recommended to keep away from the module according to the strength of the interference. If circumstances permit, proper isolation and shielding can be done.
10、Assume that there are traces (high-frequency digital, high-frequency analog, power traces) around the module that will greatly affect the performance of the module. It is recommended to stay away from the module according to the strength of the interference. If possible, you can do it properly. Isolation and shielding;
11、If the communication line uses a 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is still a risk of damage);
12、Try to stay away from some physical layers and also have a 2.4GHz TTL protocol, for example: USB3.0;
13、The antenna mounting structure has a great influence on the performance of the module. It is necessary to ensure that the antenna is exposed, preferably vertically upward. When the module is installed inside the casing, a high-quality antenna extension cable can be used to extend the antenna to the outside of the casing;
14、The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly weakened;
15、The onboard PCB antenna should avoid conductors or other sources of interference as much as possible.
C.Software writing
1、Insert the module on the user's circuit board, use the microcontroller to communicate with the module for SPI or serial port, and operate the control register and the transceiver buffer through the SPI instruction, that is, the wireless data transceiving function can be completed; the module register read and write operation sequence operation Please refer to the latest nRF24L01P data sheet.
2、IRQ is an interrupt pin, which can be used to wake up the microcontroller and achieve fast response. It can be used to obtain the interrupt status by SPI query (not recommended, which is not conducive to the overall power consumption, and the efficiency is low).
3、CE can be connected to a high level for a long time, but the module must first be set to the POWER DOWN power-down mode when writing the register. It is recommended that the CE be controlled by the microcontroller pin.
