TinySerial, a USB to TTL serial port that can be installed in a Type-C connector

Notes on board making
Pay attention to the board thickness! Pay attention to the board thickness! Pay attention to the board thickness! Please be sure to select a board thickness of 0.8mm. The default board thickness is not suitable for the Type-C plug of the splint!
If using SMD LEDs, it is recommended to choose black solder mask color for better results.
There may be burrs on the edge of the sample (generally there will be no such problem when the board is assembled in large-scale production). It is recommended to use sandpaper to polish it appropriately.
All hardware designs are open source with the CERN-OHL-P protocol. Welcome everyone to come up with more creative works on this basis~
 
Functional introduction
As you can see, the functions implemented by this board are very simple:
USB to TTL serial port based on WCH CH343P, 3.3V level, strong performance, it is a must-have for home travel and overtime debugging. Children who have used it say that it is good.
You can solder resistors and LEDs on the back, etc., and it can display the sending status .
If there must be a third point, it is that the volume is small enough to be stuffed into most Type-C shells
. With it, even USB to serial port can be used very elegantly, adding fun to boring work and making electronic design more stylish. (I believe what you said.
 
It should be noted that most of the board packages are redrawn, especially 0603 and 0402, which use a more compact package to save PCB area. The electric soldering iron may not be able to solder well. It is recommended to use a heat gun or teppanyaki.
If you need a TNOW light, you need to solder the components on the back. If you don't need it, you can leave it blank.
The plug uses a Type-C 24pin splint male plug, which is suitable for a 0.8mm board thickness. For specific models and purchase links, please refer to the packaging information.
The fuse can be replaced with a 0 ohm resistor or a lump of tin according to your mood, as long as you think it will not be inserted incorrectly or output too much current (seriously
, by the way, the narrow design of the lower half of the board is to fit into a specific plug (such as the light-transmitting one below). When proofing, it may not be possible to make an obvious step-like effect (the board is too small to make an edge), but it generally does not affect the use. Pin
 
definition: When the PCB is turned over to the chip facing up and the Type-C port facing outward, the definitions of the pads from left to right are:
VCC (+5V output)
TX (connected to the target's RX)
RX (connected to the target's TX)
GND
can refer to the silk screen on the back, which corresponds to the position of the pad.
 
Finally, here are a few beautiful pictures:
 
Accessories Recommendation
For the finished USB to serial cable, in addition to the soldered head, the following accessories are also required to work:
4-core signal line, which can transmit power and TX/RX signals
Type-C shell (although it does not affect the use in theory, a good-looking shell is really important
The connector of the target board, the most common should be the 2.54mm DuPont female head
Optional LED light
 
signal
line For the signal line, it is necessary to pay attention to the appropriate thickness. Generally, a 5mm outer diameter and 0.2mm² signal line can meet the use. It is not recommended to use a signal line that is too thick, which may cause welding difficulties.
Here is recommended https://item.taobao.com/item.htm?id=674946621378, silicone line has a good feel and is anti-entanglement, Teflon is resistant to high temperatures, and is suitable for welding.
 
Type-C shell
This is the essence of USB to serial port (I am sure), and it is very meaningful to choose a good-looking and durable shell. Here I recommend the following three shells according to different needs.
 
I hope the shell can be transparent, recommend https://item.taobao.com/item.htm?id=685708109301.
I haven't seen a fully transparent shell on Taobao. This can be said to be a more beautiful one among the transparent ones, but the feel and appearance are not as strong as the one below.
 
I hope the shell has a good texture, recommend https://item.taobao.com/item.htm?id=680390786712.
The appearance is the highest among the Type-C heads on hand, with fine craftsmanship and simple assembly. You can pretend to be a USB to serial port cable from a large factory~
 
I hope the size is as small as possible, recommend https://item.taobao.com/item.htm?id=666733828814.
This one looks pretty good, and of course the most important thing is that it's small. There are smaller ones in his store, but they look a bit ugly. At least this one is the same width. The reserved solder pads on
 
the LED light board are 0603, but the solder pads can also be used to solder 0805 or direct-plug LEDs. If you use the transparent Type-C shell above, it is recommended to use direct-plug LEDs and pull the LEDs to the transparent part of the plug to achieve 360-degree uniform light emission for better results. As for the LED color, ice blue and pink are highly recommended. These two colors are really beautiful.