Original intention

We may move the development board around when we burn the program. Is there a way for us to make the development board able to burn the program wirelessly?

For this reason, I found this wireless transceiver module on the Internet: LC12S!

Module Introduction

Use standard TTL level UART serial port

Half-duplex communication, strong anti-interference ability

2.4GHz ISM band, no application required

Maximum output power 12dBm, receiving sensitivity -95dBm, transmitting working current 40mA @ 12dBm, receiving working current 24mA, sleep current 3.5uA

Working frequency can be set, multiple modules are frequency division multiplexed, and do not interfere with each other

Communication protocol conversion and RF transceiver switching are completed automatically, users do not need to intervene, it is simple and easy to use

Communication rate 0.6kbps -38.4kbps, user can configure through AT command

Long transmission distance, up to 120 meters without interference in open areas

Small size SMD package, easy to install

3D preview of the board:

Recommended process of circuit board

Since the USB interface requires a thickness of 2.4mm, it is recommended to use the LC12S wireless transceiver module + gasket to export Gerber files. When ordering, choose a 1.2mm board thickness.

Debugging method

After power-on, when the CS pin is connected to a low level, the SET pin is to set the parameter flag bit. Pulling it low or shorting to the ground can switch the module to the parameter configuration mode pin to set it. TXD and RXD pins Work at high level.

Once in the setting state, the SET pin configuration must be low, the CS pin must be low, and the serial port settings must be data bit 8, baud rate 9600, parity bit N, stop bit 1, air rate 1Mbps .

Data Format:

Host sending: 0xaa + 0x5a + module ID + network ID (the ID of the transmitter and receiver must be the same) + 0x00 + RF transmit power + 0x00 + serial rate + 0x00 + RF channel selection + 0x00 + 0x00 + 0x12 (byte length) + 0x00 + Sum check byte

E.g:

Host sends: AA5A22331122000000040064000000120006

Referring to the following data table, the above configuration parameters set the wireless module to:

RF transmit power: 12dbm

Serial port rate: 9600bps

RF channel: 100

Module ID: 0x2233

Sum check byte: 06

Return data: AA5B22331122000000040064000000120007

Please set the corresponding parameters according to your needs for specific values

Parameter setting table:

Parameter configuration table: