Cat.1 DTU extended version

As I wrote before,
this thing is actually my graduation project, but it is just for graduation. It is very simple and what function does it have?
There is a 485 interface, using the SP3485 chip. Friends who know how high the differential voltage of this thing can be can comment below wwwwww.
There is an onboard interface that is directly compatible with the EC600N-CN module (it seems to be called Jiang or something? Just go to the Quectel Taobao store), plug it in and use it.
It has a battery power interface and an independent switch (wide voltage input, AMS1117-5 solution).
It has a serial port. Generally, the CH340G
does not have many things, but it is very practical. It is great for IoT development. There is
a 20-pin customization reserved on the right side. I originally wanted to use this thing as a TFT interface, but later I found that this thing is much more practical than TFT. What can I do with this thing? No hhhhh
Is there a BUG?
Yes, there was an error on the serial port side, but it is a good solution.
Do not solder D5D6 when soldering. Only solder R19 on the left side (stand it up). Just fly the wire on the right side of the resistor to the lower pin of D5.
See the picture of the cute little red fly The
scalability of the cable (dense fog)
is very good. I have pins on both sides. I want to do whatever I want. How can I get the
source code
library of EC600N-CN? Please message me privately for
version update .
The next goal is to have no cavities
. Modify the hardware. Defect
Added Boost Module
Added Burner (daplink)
Shell DXF File See Attachment