** liver code. . . Current version 1.0V** Update log: ## Work introduction
This work is a LoRa expansion board based on Lichuang's self-made Liangshan School development board. The expansion board is modularly assembled for easy disassembly and replacement. This open source is the gateway version. It can realize the transmission of node LoRa data to the gateway controller, and then transmit it to the cloud platform through 4G signal or WiFi signal. Complete basic IoT development. This expansion board integrates common IoT communication modules, making it easy and fast to develop and complete the required project functions. ###
This expansion board can learn LoRa development, WiFi development, and 4G development. LoRa gateway development and other practical functions. The modular structure allows you to select the required modules for installation and disassembly. This expansion board is designed by combining most of the functions on the market and is suitable for learning, development and other purposes. ## Work function
1.
The expansion board uses two LoRa modules. The first one is the commonly used **Serial Port LoRa**, and there are three reserved ones. interface, compatible with most serial port LoRaM modules on the market. The second is to transmit the LoRa module through the **SPI protocol**. This development board chooses the Essence RA series, which is not compatible with RA-06, RA-07, RA-07H, RA-08, and RA-08H. Others are Supported (MCU integrated inside this series). ** 2.
The 4G module uses the **FS800E CAT.1 module** produced by Freestron. I purchased this module at 19.9 and it includes a card. (Newcomer discount), product testing, learning is no problem, the card is valid for half a year. The AT command is used. 3.
The WiFi module expansion is a WiFi expansion module drawn by myself (**see my open source homepage for details**), using ESP32-C3 12F Anxinke The module integrates WiFi+BLE and uses AT commands to implement WiFi or Bluetooth development. **And a TYPE-C interface** is reserved, which can realize various firmware replacements and facilitate development. 4.
The buzzer uses **active buzzer** and does not require PMW (the Liangshan School has fewer data lines), but this circuit is also applicable For the passive PWM controlled buzzer, it is universal here. (In fact, in order to reduce code development - laziness) 5.
OLED screen uses the common **0.91 inch, IIC interface**. There was also a lot of demand and it was added. 6.
Four user buttons are reserved. The layout adopts the common **up, down, left and right buttons**. If not, there are also them on the Liangshan School development board. Three buttons are used. 7.
This development board also reserves a serial port for **serial screen** use, using 2.54 pin headers and reserved silk screen, suitable for Most serial screens. **This pin has been crossed with TX and RX, just connect it directly according to the silk screen. ** ![LoRa expansion board-hardware block diagram]
## Software description
**
Most of the software codes are provided in the attachment. It is currently tentative to upload the basic test code**
* [ ] means not completed
* [x] means it has been completed and the attachment has been uploaded
* * *
**
Code progress:**
1. [ ] Serial LoRa point-to-point test code
2. [ ] SPI LoRa point-to-point test code
3. [ ] 4G module Lianyun test code
4. [ ] WiFi module test code
5. [ ] OLED test code
6. [ ] Button test code
7. [ ] Buzzer test code
8. [ ] Serial screen test code
## Physical display instructions
![1.png]
![IMG_6181.JPG]
## Notes
When welding, please pay attention to the welding sequence to ensure that the power supply is not short-circuited and the 5V voltage is not overvoltage. The welding sequence should follow the principle from shortest to smallest and from inside to outside.
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