STC Microcontroller Minimum System Version

PDF_STC Microcontroller Minimum System Version.zip

Altium_STC microcontroller minimum system version.zip

PADS_STC Microcontroller Minimum System Version.zip

BOM_STC Microcontroller Minimum System Version.xlsx

93458

STM32F103 expansion board, compatible with Jiangxie Technology tutorials

This STM32F103 expansion board is designed for use with Jiangxie Technology tutorials. The design philosophy emphasizes compactness and convenience, with all I/O ports exposed. The
exposed pin headers and headers can be used to connect to MPU6050, W25Q64, OLED, USART1, and 4 power supply pin pairs.

This is a comparison of the board's actual size
with a mouse; the board itself is smaller than half the size of a mouse
.
It's an
STM32F103 expansion board, suitable for Jiangxie Technology tutorials. The design philosophy is compactness and convenience. All I/O ports are brought out,
with headers and pin headers for connecting to MPU6050, W25Q64, OLED, USART1, and 4 power pin pairs.
Considering the small size of the reset button on the minimum system board, it's also brought out and
packaged on the expansion board
using a 4.5*4.5mm small button package. Resistors and LEDs are 0805 resistors, and both headers and pin headers are 2.54mm.

Demo video.mp4

STM32F103 Extended Version Gerber.zip

PDF_STM32F103 Expansion Board, for Jiangxie Technology Tutorials.zip

Altium_STM32F103 expansion board, suitable for Jiangxie Technology tutorials.zip

PADS_STM32F103 expansion board, compatible with Jiangxie Technology tutorials.zip

BOM_STM32F103 Expansion Board, Applicable to Jiangxie Technology Tutorials.xlsx

93459

STC version of the "Slacking Off" keyboard

STC's USB keypad features integrated LED lights, a reserved OLED interface, and can also be used to solder an infrared head.

I. Team Introduction:
JiGe DIY is an electronics enthusiast who enjoys making various small electronic projects. Those interested in learning and exchanging ideas can search for "[JiGe DIY]" online.
II. Design Summary:
I've been using STC microcontrollers to make various gadgets. Recently, I've enjoyed tinkering with the USB function of STC microcontrollers. Seeing many USB examples on the STC official website, I decided to make a small board using STC. First, I'll implement a USB keyboard, and then I'll research implementing a USB flash drive.
III. Design Diagram:
The overall framework is simple, using a microcontroller as the core and adding a few peripherals. An OLED interface is provided.
IV. Hardware Circuit Composition :
The circuit is relatively small and simple.
1. Level Conversion: A 1117-3.3 converter is used to convert 5V to 3.3V to power the microcontroller and peripherals.
2. Indicator Lights: LED indicators are directly connected to the microcontroller's I/O ports for flashing operation prompts.
3. Memory Chip: W25Q series memory chips; all pins are connected to the microcontroller's I/O ports, allowing for various software-configurable functions.
4. Colorful LEDs: A single WS2812B LED can be designed to create a cool, colorful display on the board.
5. Expansion Interfaces: A row of 2.54mm connectors is provided at the rear of the board, allowing for the soldering of OLED displays, infrared receivers, or other peripherals.
V. Physical Demonstration VI

. Program and Related Expansion
Programs: The program is based on the official documentation with slight modifications. You can also make other modifications and experiments according to your own needs.
Because of the reserved expansion interfaces, the program can be freely adjusted.

USB Mouse and Keyboard Composite Routine (with Color Lights).rar

PDF_STC version of the "Slacking Off" keyboard.zip

Altium_STC version of the "Slacking Off" keyboard.zip

PADS_STC version of the "Slacking Off" keyboard.zip

BOM_STC version of the "Slacking Off Keyboard".xlsx

93460

1.54-inch e-ink screen driver board

The motherboard is built to a 1:1 scale with the Waveshare 1.54-inch e-ink screen, with a perfect fit between the screen and motherboard. It supports battery power and Bluetooth/WiFi image transmission. It's comparable
to the development board sold for 77 yuan on the Waveshare official website.

01 Introduction
Wouldn't you like to try making an e-ink screen (also called a paper-like screen) driver board using a free PCB?
This product directly rivals the driver board sold for 77 RMB on the Waveshare website (the codes for both driver boards are interchangeable).
This board can transfer images via a mobile app or computer webpage (the only drawback is that these two transfer methods can only be used one at a time, not simultaneously).
It supports charging via a Type-A to Type-C interface data cable, and the LED turns off when the battery is fully charged.
It also supports the entire Waveshare e-ink screen series (which can be expanded to include: clocks, desktop ornaments, e-books, calendars, etc.).
02 Inspiration
A friend gave me an e-ink screen, which sparked my curiosity.
So, I briefly browsed through some open-source projects online...
  "Forget it, none of them are to my liking."
  "I'll just make one myself."
And so, this article you're reading now came about...
03 Overall Parameters



WiFi Standard
802.11b/g/n


Bluetooth Standard
Classic Bluetooth (BR/EDR) and Bluetooth Low Energy (BLE)


Communication Interface
4-wire SPI (default)


Operating Voltage
3.2V-5V


Operating Current
20mA ~ 150mA


Dimensions
3.1×3.7



Click to view [Supported Screen List]
04 Hardware Design
To ensure signal strength, a slot was made at the top of the PCB.
In my design, I made the Type-C interface protrude slightly outwards, which will make it easier to design the casing later.
You can directly use a free PCB for board making; I recommend a thickness of 1mm and black solder mask. (Free stuff is always better!)
05 Soldering/Making Tutorial
For board making, I recommend a thickness of 1.0mm and black solder mask; gold plating is best if possible (not using gold plating won't affect soldering or actual use).
If you want to make this, you definitely need to know how to solder; if you don't know how to solder... well, forget it.
I recommend using a soldering station and a hot air gun, as they are quite convenient.
Use the soldering station for the bottom (the components are small and varied; a hot air gun could easily blow them away). Use
a hot air gun for the top; I recommend using "room temperature leaded solder paste" for better results.
Battery model: 503035. I bought 600mAh batteries for 8.1 yuan each, and also asked the seller to provide 1.25mm terminals. [Click here for the same battery] (ps: I'm not getting paid for advertising; their service is genuinely good).
06 The code burning
program comes in two versions: WiFi connection and Bluetooth connection. You can only choose one.
Before burning, please ensure your computer has the CH340 serial port driver installed. If not, please download "CH340 serial port driver.exe" from the attachment and install it.
A: Bluetooth Connection Tutorial

1. Download the two files "esp32 e-ink screen - Bluetooth connection.zip" and "ESP32 offline driver.exe" from the attachment.
2. Install Arduino IDE on your computer
. 3. Install the ESP32 offline driver
. 4. Unzip the compressed package
. 5. Open "Loader_esp32bt.ino" in the "Loader_esp32bt" folder.
6. Click: Select Development Board . 7. Connect the soldered board to the computer using a USB cable, search for "esp32 dev module", and click it. Select the port number corresponding to the development board on the right. 8. Click "Upload" in the upper left corner of the program . 9. Wait for the upload to complete, then click the reset button on the module to restart it.
10. Install the APK on your mobile phone (in the compressed package).
11. Open the app. 12. Done! Connect and use it in the app!
13. Bluetooth connection app related issues explanation (with pictures)
B: WiFi connection tutorial

1. Download the two files "esp32 e-ink screen - WiFi connection.zip" and "ESP32 offline driver.exe" from the attachment.
2. Install Arduino IDE on your computer
. 3. Install the ESP32 offline driver
. 4. Unzip the compressed file
. 5. Open "Loader_esp32wf.ino" in the "Loader_esp32wf" folder.
6. Complete steps 5-7 of the "Bluetooth Connection Tutorial" (I'm too lazy to write them again), and upload the program to the development board.
7. As shown in the image, find "srvr.h" at the top of the Arduino and click it  . 8. Scroll down to line 26. Modify the data in lines 27-34 according to your network conditions. 9. Complete steps 7-9 of the "Bluetooth Connection Tutorial" (I'm too lazy to write them again).
10. Access the IP address you just set for the device in your browser. Success! 11. WiFi Connection App Related Issues Explained (with Pictures)
If you're still unsure... you can check out the official WaveShare tutorial: https://www.waveshare.net/shop/e-Paper-ESP32-Driver-Board.htm
    (The official tutorial is probably more detailed. For the flashing code, I recommend using the one I uploaded in the attachment; I've translated it into Chinese for a better reading experience.)
This concludes the article. If you have any questions or valuable feedback, you can click here to get my contact information.