BoooomZYNQ_BasicExpandBoard

PDF_CH343 USB to Serial Port Module.zip

Altium_CH343 USB to Serial Port Module.zip

PADS_CH343 USB to Serial Port Module.zip

BOM_CH343 USB to Serial Port Module.xlsx

95284

42-inch mini keyboard

The Gai42mini is a modified version of the Gai42 project, using the CH552G as the main controller.

Preface:
This is a small project I made for my own amusement, a simple modification of the "Bare 42" project open-sourced by Teacher Shengcai and the great Suiyuner'an. Due to the request from group members to open-source it, and with the permission of Teacher Shengcai and the great Suiyuner'an, I am now open-sourcing this project...
Since it is not original, I will not go into too much detail. I will provide a link to the Beggar 42 project later for everyone to download the firmware and related materials. I hope you will consciously abide by the open-source rules.
Key layout diagram:
Default key layout:
Key layout after pressing FN:
Key layout after pressing Caps:
PS: The positions of some keys in this project are slightly different from the above diagram. Please refer to the default key layout printed on the PCB.
Related components:
This small keyboard uses very few types of components, so the replication difficulty is relatively low (I think). However, you need to pay attention to the specifications of some components, as shown in the table below:



Specifications


image



























PS: ① The four-pin fully surface-mount Type-C female connector Pro version is not needed. If you are only replicating the Pro version, you may not need to buy it.
② Resistors and capacitors are all 0805 packages.
③ Other components are based on the models shown in the schematic.
Special thanks:
Thanks to Teacher Shengcai for the firmware resources and to the open-source hardware materials from the expert Suiyuneran.
Regarding third-party sellers (here, I'll paraphrase Teacher Shengcai):
Here's a suggestion: the author hopes buyers can post reviews with pictures in this comment section.
If sellers make a certain profit, could they consider tipping the author to help with future development and improvements?
Of course, selling less than 5 sets is fine; from what I understand, most sellers are students, and I support them recouping some costs with extra materials.
Perhaps if it exceeds that, a 2 RMB tip could be given to the author for each set sold (I would pass this on to Teacher Shengcai and the expert Suiyuneran, I won't need it myself)? More than that is unnecessary; otherwise, passing the cost onto buyers will reduce competitiveness.
Related Links:
Original Project Link for the Basic 42 Keyboard: Basic 42 Keyboard - Modular Version (CH552G) - JLCPCB EDA Open Source Hardware Platform (oshwhub.com)
Product Showcase:
The Mini version uploaded the shell modeling file, and the Pro version also uploaded the base modeling file (divided into versions with and without logo), both in STEP format, as shown below:
Mini version shell:
Pro version base (with logo):
Update:
2024/3/13 Update:
Added "Basic 42miniPro new" version:
① Added Caps Lock indicator light, using a 0805 packaged monochrome LED, the color can be purchased according to personal preference;
② Optimized the placement of some components;
③ Removed the text logo on the front, replaced with an image logo.
PS: The Basic 42miniPro new version does not yet have a physical product, but the circuit has been verified by flying wires, as shown in the attached video.
Updated 2024/4/10:
Fixed the spelling error of the tag "SHIFT" [The author was distracted while designing the tablet; for those who have already made their own, consider this a little Easter egg, or perhaps an anti-counterfeiting measure? Hehe (* /ω＼*) ]

42 mini casing.step

Base model 42 miniPRO stand.step

Base model 42 miniPRO base with logo version.step

Caps Lock Demo.mp4

PDF_Bai42 mini keyboard.zip

Altium_budget42 mini keyboard.zip

PADS_42 Mini Keyboard.zip

BOM_丐42mini keypad.xlsx

95285

[Under Improvement] 74-series 8-bit CPU

8-bit CPU built using 74 series chips

I. Project Introduction
This project is an 8-bit CPU designed based on the architecture of the YouTuber Ben Eater, using the 74 series chip.
II. Overall Design Block Diagram III. Hardware Circuit Composition
 
IV. Physical Demonstration
V. Notes
This is a beginner's drawing board; there are many flying wires, please bear with us.
VI. Attachments
To be added Attachment 1: XXXX Attachment 2: XXXX
 

video_20240410_193650_edit.mp4

PDF_[Under Development] 74-series 8-bit CPU.zip

Altium_ [Under Development] 74-series 8-bit CPU.zip

PADS_ [Under Development] 74-series 8-bit CPU.zip

95289

Allwinner V3S M.2 Module Development Board

To facilitate rapid expansion and adaptation to my creative needs, I created a V3S core board with an m2 interface. Later development only requires a simple baseboard to complete the process.

Originally, I wanted to make a smart photo frame, but the existing boards varied in shape and size, and installing the screen would require various wiring modifications. Therefore, I created this module with basic functions to simplify later production without needing to consider core wiring; I only needed to focus on developing a compatible baseboard for changing requirements.
 
Except for the WiFi pin, all other pins are expandable.
 
Features include an onboard wireless module, an onboard TF card pin, an onboard FLASH pin for SPI applications, an onboard serial chip with a Type-C interface for easy debugging, and an onboard USB pin for expanding USB interfaces using a USB expansion chip.
 
For PCB testing, it runs perfectly on the Lychee Pi system.