Dual Frequency Wireless Decoding Module RF Radio Remote Control Switch Board 315Mhz 433Mhz Receiver Controller DC 3.3V-5.5V RF34B
Product introduction:
This product is a wireless decoding module that supports two frequencies of 315 and 433. It can be used to connect to a single-chip microcomputer to judge the remote control code and realize various functions. It can also be connected to a computer with USB-TTL, serial port to receive data, and host computer programming Realize computer control!
Product parameters:
Working voltage: DC 3.3-5.5V
Standby current: 16.4MA
Current when receiving signal: 16.2MA
Interface: TTL serial port (that is, the serial port of the MCU, not 232 or 485)
Receiving distance: the open distance is more than 100 meters (specifically related to the transmitter power, the greater the power, the longer the distance)
Serial communication wave: 4800bps, 9600bps, 57600bps, 115200bps. The default is 9600bps
Signal output continuously, can be set to single output mode
Product size: 2.5x3.3x1.2 CM
Antenna length: 2.2cm (can be straightened more than 10cm)
Decoding restrictions:
Support decoding signal: the chip model is: 2260, 2262, 2240, 2264, 1527, 1520, SMC918, FP527 end
Support decoding frequency: 315Mhz or 433Mhz
Support oscillation resistance range: 1.8M-5.6M (1527 range 170K-910K)-pulse width should be more than 1ms
Interface Description:
VCC: positive supply voltage
TXD: Serial output (decoding output)
RXD: serial port input (used to set parameters)
GND: negative pole of power supply
Instructions for use:
Output data format
Decoding method: This module is always in the decoding state, just press the remote control that meets the requirements to output the decoding.
Decoding format: As shown in the figure above, the decoding format is in hexadecimal format. The default is to output the decoding until the remote control releases the button, or it can be output once through the electrical port.
Modify the module baud rate:
Send the corresponding command through the serial port to modify the corresponding baud rate. The command format is hexadecimal, and the specific correspondence is as follows:
0xFD, 0xF1,0x01,0xdf ----- Modify the baud rate: 4800bps
0xFD, 0xF1,0x02,0xdf ----- modify the baud rate: 9600bps
0xFD, 0xF1,0x03, 0xdf ----- modify the baud rate: 57600bps
0xFD, 0xF1,0x04,0xdf ----- modify the baud rate: 115200bps
If the modification is successful, the serial port will feedback F1
Use the serial port assistant software to send the interface as follows. Modified to 9600bps example:
(Note: After the baud rate is modified successfully, it will take effect immediately. If you forget the baud rate, you can group one to try and see if the baud rate is normal)
Modification method of serial port output mode
The output defaults to continuously output multiple sets of signals, which can be set to output only once. The setting instructions are as follows:
0xFD, 0xF2, 0x01,0xdf ----Set to output the decoded data only once. --Feedback information: 0xF2
0xFD, 0xF2, 0x02, 0xdf ---- set to output the decoded data continuously until the signal disappears.
Feedback message of successful setting: 0xF3
Note:
1. How far is the receiving distance?
Answer: The receiving distance is also related to the environment, depending on the transmitter power of the remote control.
2. Can the remote control of a certain brand of curtains, rolling shutters and alarms be decoded?
Answer: This product supports decoding and encoding chip models: 2260, 2262, 2240, 2264, 1527, 1520, SMC918, FP527 ending in chips, the frequency is 433Mhz or 315Mhz. This needs to determine whether the product remote control is a related type of core (such as the remote control chip is generally not supported)
3. Why is there no decoding output when I press my remote control?
Answer: Before using, you need to determine the frequency and chip model of your remote control. If there is a mismatch between the frequency and the model, the output cannot be decoded. Therefore, the purchase frequency must be the same, for example, 315M remote control must purchase 315M equipment.
4. How to see if the remote control chip model and frequency symbol do not match?
Answer: You can consult the remote control vendor for this, or you can disassemble the remote control shell by yourself. You can see that there is a metal block inside, usually with words printed on it. Normally you can see 315Mhz or 433Mhz, and the chip model can see the largest one. The black blocks generally have 8 feet or 16 feet or more, and they are also printed with common words. 2262, 2260, 1527 are supported.
5. How to use the MCU to receive data
Answer: This module uses serial communication. It is necessary to master the knowledge of the MCU serial port receiving system. According to the serial communication protocol of this module, the corresponding hexadecimal data is received and saved or judged to process the interface.
6. Why is there so much data output from the serial port?
Answer: This module defaults to continuous output mode, which can be set to single output mode through the serial port. But no matter what the mode is, we only need to find the 7 bytes of data at the beginning of FD and end of DF to be the decoded data of the signal, and other data that belong to the same signal can also be used. It's just that the oscillating parameters will be a bit biased, and other data will remain unchanged.
7. Which signal is received when there are 433 and 315M2 signals simultaneously?
Answer: This module is dual-frequency decoding, but it can only receive and decode one signal at a time. By default, this module will give 433M signal priority decoding output. At this time, the 315M signal will be ignored without decoding and not output. Until the 433M signal disappeared.
