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ZF02-96 is an ultra-small, ultra-low power consumption, high-speed wireless data transmission module. It has excellent performance and is currently an ideal device for low-power wireless data transmission applications. The article introduces the main features, pin functions, software design, hardware connection methods and specific application circuits of ZF02-96.
Overview:
Since there are many types of wireless transceiver modules at present, how to choose the required modules in the design is very important. The correct choice can reduce detours, reduce costs, and promote products to the market faster. The new wireless transceiver described in this article Module ZF02-96 is an ultra-small, ultra-low power consumption, high-speed wireless data transmission module. It adopts serial port transmission, application and programming are very simple, the transmission efficiency is very high, and the required peripheral components are few, the product development cost is low, the power consumption is low, the pin is small, the package is small, so it is beneficial to reduce the PCB board area and lower the cost.
ZF02-96 is composed of a single IC. It adopts FSK modulation, and the receiver and transmitter are integrated, so it has strong anti-interference ability. It is suitable for embedded devices. It adopts low transmit power and high sensitivity design, which can meet the requirements of wireless control without The license is the ideal choice for low-power wireless data transmission. The main features of ZF02-96 are as follows:
●Receive and launch unity;
●The working frequency is the internationally used 433MHz digital transmission frequency band;
●Adopt FSK modulation method, strong anti-interference ability, especially suitable for industrial control occasions;
●Using frequency synthesis technology, excellent frequency stability;
●The sensitivity is up to -118dBm;
●The maximum transmit power is +10dBm;
●Low working voltage (3.3V~5V), low power consumption
●The maximum working rate can be 1200/2400/4800/9600/19200bps;
●Ultra small size;
●It can be directly connected to the serial port of the single-chip microcomputer, and the programming is very convenient;
●Due to the design of low transmitting power and high receiving sensitivity, there is no need to apply for a license when using it;
Pin function of ZF02-96
The functions of each pin of the ZF02-96 module are as follows:
GND: power ground;
VCC: Positive power supply 3.3V~5V
RXD: TTL data receiving end;
TXD: TTL data transmitter;
SGND: signal ground;
D+(TXD): RS-232 data transmitter/ RS-485D+
D-(RXD): RS-232 data receiving end/ RS-485D-
Application of ZF02-96 in temperature measurement and control system
With ZF02-96, point-to-point transmission of data collection can be realized, and a point-to-multipoint two-way data transmission channel can also be formed.
In this system, ZF02-96 can transmit the temperature data collected by the temperature sensor to the computer, and at the same time transmit the control signal sent by the computer to the single-chip computer, so as to realize the wireless data communication between the single-chip computer and the computer. ZF02-96 can be directly connected to the serial port or I/O port of the single-chip microcomputer. When connecting, the receiving end RXD of the ZF02-96 wireless module should be connected to the sending end of the single-chip serial port, and the transmitting end TXD should be connected to the receiving end of the single-chip serial port. The I/O of the single-chip microcomputer can be used to control the transmission, channel switching and low power consumption mode of the module.
Based on the characteristics of the wireless transceiver module, when designing the software of the system, special attention should be paid to the formulation of the communication protocol and the processing of error detection. When there is no signal, the serial output of ZF02-96 is random data, so the first thing of the protocol is to be able to identify noise and valid data. Through tests and experiments, it is found that OXFF followed by OXOO is not easy to occur in noise. Therefore, the data sent by the microcontroller can start with any byte of content (because the data of the first byte is easy to lose when sending), then OXFF followed by OOXOO , The receiving protocol stipulates that only receiving starts with OXFF. And followed by an OXOO data packet.
In addition, attention should be paid to the error detection and correction of the data. The error detection of this system adopts the checksum method, and the error correction adopts the method of three consecutive transmissions. The same data is sent three times in a row, and then each bit of the three data is compared at the receiving end. If the bit of at least two data is the same, the bit is correct. In short, a complete wireless transmission protocol is:
[开始1][开始1][开始2][数据1][数据2][数据3][校验和].
The beginning 1 is OXFF, and the beginning 2 is OXOO. If the checksum is correct, the data transmission is complete. Then compare data 1, data 2, and data 3, and take two of the same ones to give a response signal. If the data itself is incompletely transmitted, it will not respond, and the system will resend the data.
Since the system composed of ZF02-96 can complete point-to-point data collection and transmission and point-to-multipoint two-way data transmission, ZF02-96 can be widely used in remote control, telemetry, wireless meter reading, access control systems, cell paging, wireless tags, and identification , Non-contact RF smart card, security system, wireless remote control system, biological signal acquisition, hydrometeorological monitoring, electronic stop sign, intelligent transportation, wireless electronic weighing instrument, industrial equipment data acquisition, various measurement and control equipment.
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