Wireless communication solution

Program background: generally the wireless communication module includes a wireless modulator module and wireless output, or inrease output circuit with the power amplifier, to increase the wireless transmission distance. Such modules cannot guarantee the reliability of communications during use, are very easy to loss the communication datas if there is co-channel interference or broadband frequency interference case. Using a hardware communication protocol processor program, due to the protocol introduction, increasing the difficulty of application development, and having higher chip and manufacturing cost, it's not conducive to rapidly introduce into target product for users. This program adopts MCU + CC2500 + PA structure, run high-end communication protocol via MCU, to ensure communication data is correctly sent to the receiver, on the host controller using a standard UART communication mode, do not require any add-ons particular communication protocol, very easy to apply to the products, even for the most old-fashioned design, you can also carry out wireless control without change any software.

Structure:

Module Ports: UART communication port, Bit transfers format 1+8+1, that is 1 start bit, 8 data bits, 1 stop bit

Module RF frequency:2.4G

Module max. output:20db

Module power supply voltage:5V

Module Wireless working mode: half-duplex, when wireless transmission one part to send another one to receive

DEMO module provide: USB Interface, can be directly connected to the PC for testing, may also be used as a PC transceiver interface; serial port can be connected directly with the host MCU.

UART Port: Pin1 --Power GND

Pin2 --Signal line, function is given by a specific module, nonuse without customization feature.

Pin3 --RXD Serial signal input

Pin4 --TXD Serial signal output

Pin5 --Vcc +5V input

Note: If use the USB interface, UART interface won’t be used

Actual object is shown as below, DEMO module contains a USB port, UART port, a positive component layout and component layout of the back.

Test Demo:

Use PC USB interface to test, insert the module to the USB socket of the PC machine, install the USB driver (Cp210x_Driver), after the installation successful, then run the UART debugging program, set the correct COM port, COM port number is provided by the PC- equipment management program which can obtain by query. COM port settings parameters: Baud rate 19200, Parity bit No, Data bits 8, Stop bit 1;

as shown below:

When testing, can simultaneously receive and send, data buffer is provided by the MCU in the module. But due to the wireless signal transmission is half-duplex in the air, serial data cannot do full-duplex transmission at full capacity on COM port.

Customization:

1. PCB board customization: can be customized according to customer requirements, such as interface, size, antenna output.

2. Baud rate and set: can use a fixed UART baud rate according to customer requirements, can also add baud rate configure command, to convenient for customers in application configuration.

3. Other features customization: According to customer request for additional functions, such as increasing the protocol command, to achieve communication signal strength testing and customer set the communication module identification code, and the realization of multi-group network communication protocol module.