5000mAh power bank redesign

ProProject_Mini Cake Top Layer_2023-10-28.epro

Small cake.7z

WCHISPTool_Setup.exe

VID_20231028_140415.mp4

PDF_CyberCake.zip

Altium_Cybercake.zip

PADS_CyberCake.zip

BOM_CyberCake.xlsx

97292

Call for Designs | Smart Community Control System

An IoT controller that remotely controls 8 relays via the Alibaba Cloud platform to achieve relevant functions.

Introduction:
This is an IoT control system based on the Alibaba Cloud IoT platform. Through this system, users can remotely control the switching of various electrical devices, achieving intelligent control.
The system utilizes the powerful functions of the Alibaba Cloud platform to acquire real-time status information of electrical equipment and feed it back to the cloud, allowing users to monitor and manage equipment anytime, anywhere.
One of the key technological innovations is the use of circuit boards designed by LCSC EDA and prototyped from JLCSC, providing efficient and reliable hardware support for the system.
 
Soldering Process:
First, a separate design for surface-mount components is used for soldering on an iron plate
 

 

, ensuring easy disassembly and replacement of components, while each relay has protection. An ESP8266 is used to receive cloud information, and ADRUINO is used to process information and control device
signal input detection. Remember not to add Zener diodes, otherwise problems will occur
. Also, don't add unnecessary switches; after a while, you'll forget what each switch does!
 
Cloud Control Interface Tutorial:
Based on Alibaba Cloud IoT Smart Home Tutorial Explanation and Debugging Webpage Domain_Bilibili_bilibili

 

Program Description:
Due to the internal circulation nature of the program, the attached file is the ATMEGA2560 program, which can connect to the Alibaba Cloud IoT control pin output signal!
 
The part that needs to be modified is the triplet information!!
 
/* WiFi name and password (This needs to be modified) */ String wifi_name = "WLAN"; String wifi_pwd = "fuqiangminzhu"; /* Alibaba Cloud Smart Classroom triplet (This needs to be modified) *///{"PRODUCT_KEY" : "a18nN6sBQO", "DEVICE_NAME" : "A_101_R", "DEVICE_SECRET" : "1ccb3db8dd115be7c1d01ef9f191f60"}String PRODUCT_KEY1 = "a1HQkQx7dL";String DEVICE_NAME1 = "A_commuity";String DEVICE_SECRET1 = "563ecbc0e7647834742805fc6ef27d1";
 
The rest are simple program concatenations.

Smart Community.txt

PDF_Call for Design_Smart Community Control System.zip

Altium_Call for Projects_Smart Community Control System.zip

PADS_Call for Design_Smart Community Control System.zip

BOM (Bill of Materials) - Solicitation Notice - Smart Community Control System.xlsx

97293

STM32-based desktop clock/weather display/desktop pet

STM32-based desktop clock/weather display/desktop pet project

Project Description:
This project uses the CC-BY-NC-SA 3.0 license. No one may use this project for commercial purposes. Any modifications must be open-sourced and the original project source must be acknowledged!
 
This project uses the CC-BY-NC-SA 3.0 license. No one may use this project for commercial purposes. Any modifications must be open-sourced and the original project source must be acknowledged!
 
This project uses the CC-BY-NC-SA 3.0 license. No one may use this project for commercial purposes. Any modifications must be open-sourced and the original project source must be acknowledged!
 
        This is the author's technical verification project. All optimization methods and module drivers were written by the author alone. Since this is the first time designing such a large project, practicality and cost were not given much consideration; it's simply following in the footsteps of experts to DIY a small TV. Replicating carries risks; please consider carefully. The project code, drawings, and models will all be open-sourced. If any experts have suggestions for modification or optimization, please point them out. The author will select the best suggestions and make modifications accordingly.
 
 
        This project is a small TV desktop clock/weather display/desktop pet project based on the STM32F412 chip and multiple peripheral modules.
 
        The mini TV automatically connects to the internet to update the date, time, and weather information, which is then displayed on the screen.
It is powered on/off and allows left/right page turning via three touch buttons on the top. Wirelessly, it supports a dedicated app for Bluetooth pairing and setting up memos (the app and corresponding firmware are currently under development). Pressing the middle button automatically enters low-power mode, and pressing it again wakes it up. In low-power mode, the entire board's 3.3V power supply is turned off; only the STM32 and touch chip remain powered (the STM32 is in low-power mode). It automatically wakes up at midnight every day, connects to the internet to retrieve the time and weather information, saves it, and then automatically
 
        goes into sleep mode. The entire development cycle of the mini TV was nearly a year and a half, filled with complex expectations/compromises and functional implementation issues. The hardware and software design ideas and architecture are introduced below, but the purely technical details are a bit dry. I'll create a post later to discuss the development process from a personal perspective; those interested can treat it as a story.
 
Mini TV Desktop Clock - Hardware Design Ideas and Introduction - JLCPCB EDA Open Source Hardware Platform (oshwhub.com)
Mini TV Desktop Clock - Software Design Architecture - JLCPCB EDA Open Source Hardware Platform (oshwhub.com)
 
 
Currently, the Mini TV uses an STM32 microcontroller paired with two wireless modules. The estimated cost per unit is over 200 RMB, and the final functionality is not powerful. It is not recommended for players seeking low-cost solutions to replicate this design.



Item


Costs (Unit Price Excluding Shipping)


Purchase Location




 


 


 




Screen


37


3.5-inch LCD Screen Display IPS Screen SPI Serial Port ILI9488 Capacitive Touch Screen Brand New Color Screen ST7796 - Taobao (taobao.com)




STM32F412VGT6


15


Second-hand




Shell on Xianyu (9000R Resin Material) (Recommended, but will yellow)


35


LCSC 3D Monkey




Shell (ASA) (Choose one from resin material)


86.09


LCSC 3D Monkey




PCB


20 (Possible to get it for free)


LCSC




AI-WB2 WIFI/Bluetooth Module


6


Anxinke's Main WiFi and Bluetooth Combination Module Ai-WB2-12F Package Compatible with ESP12F Serial Port Transparent Transmission - Taobao (taobao.com)




EC-01G NB-IOT/Positioning Module


37.9


Anxinke NB-IoT+GPS/BDS Positioning Module/EC-01G Wireless Serial Communication Module/Data Transparent Transmission - Taobao (taobao.com)




NB-IOT Antenna


2


Full-Band LTE 4G 5G NB-IoT 8DB Built-in 900m915 3G GSM PCB FPC Patch Antenna - Taobao (taobao.com)




GPS Antenna (Optional)


7


Active GPS Beidou Dual-Mode Built-in Antenna High Gain Navigation and Positioning BD Ceramic Amplification Dual-Frequency Antenna - Taobao (taobao.com)




Battery (7000mAh)


61.5


Zhongshunxin 7000mAh Mobile Outdoor Backup Power Bank Polymer Lithium Battery 3.7V 105080 - Taobao (taobao.com)




IoT Card


15


NB SIM Card Industrial NB-IoT Card Patch Card Plug-in Card NB-IoT, Mobile NB NB Module - Taobao (taobao.com)




Other Miscellaneous Items (Components, etc.)


Approximately 20


Most of the LCSC



 
 
projects have been open source since the fourth (actually the Nth) version, and in the future (may) be updated to a low-cost version using ESP32 and a high-performance touchscreen version using ARM-Linux.
 
 
 
Replica Tutorial:
1. All files in this project were drawn using Alitium Designer. Free JLC prototyping may not be available; importing the professional version is only for easy viewing.
2. Prototype the PCB and casing. The PCB thickness is 1.2mm. Purchase original components. The W25Q128 must have an FV suffix, and the battery must have a protection board.
3. Register a Xinzhi Weather account and save your KEY.
4. Solder all components. Since FPC connectors are very difficult to solder, it is recommended to solder them first to avoid damaging the entire board. Soldering is recommended using solder paste and a heating table/hot air gun. Some areas may require reshaping with a soldering iron. Components with plastic parts, such as the SIM card slot, Type-C interface, and RTC battery holder, are recommended to be soldered later. There is some conflict between the SIM card slot and the 3.3V step-up/step-down inductor and the 32.768K crystal oscillator; replicators should decide on their soldering method based on their skill level. SD card related circuitry is not currently used due to firmware limitations and can be left unsoldered for now.
5. Apply three pieces of copper foil tape to the top of the casing. Solder the leads to the three test points on the back of the PCB battery holder. The middle lead passes through the screen support frame on the back casing and is soldered to the leftmost point. The remaining two points are in the same position as the buttons. It is recommended to keep the leads as short as possible to avoid interference from inter-line capacitance to the touch screen. The battery interface is positive on the left and negative on the right. The middle point is the soldering point for the NTC detection line. If using the NTC function, R24 needs to be left unsoldered.
6. Compile the download algorithm: Open the .uvprojx file in the download algorithm. If your Keil is installed in the default directory, you can compile directly. If it is not in the default directory, it is recommended to first uncheck the box before "user commands" in target->user, and then manually copy the download algorithm file to the corresponding directory of Keil after compilation. For convenience, you can also directly copy the existing F412V4_Dflash.FLM file in the project root directory to the corresponding download algorithm storage directory on your computer.
7. Open the main project program, open USER/APP.c in the project pane, and replace the value of the macro definition USER_KEY with your previously saved key.
8. After compiling the main project, use a downloader to connect to the small TV download interface to download directly. The screen backlight should be on during the download process, which is normal. If an error message appears indicating that the download algorithm for the corresponding region was not found, it is recommended to go back and check if the copied path of the download algorithm is correct and if it matches the location where Keil automatically retrieves the download algorithm.
9. Attach the purchased NB-IoT antenna to the back cover, ensuring the antenna connector reaches the socket. (If you wish to try developing GPS functionality, you can install a GPS antenna and attach it to the GPS area of ​​the PCB; however, if you've already reached this step, you probably don't need this replication tutorial.)
10. After plugging in the screen, use M1 self-tapping screws to screw the PCB onto the back cover, ensuring the connector and switch positions are correctly aligned.
11. Fold the screen over and place it on the screen support bracket on the back cover. Be careful not to break the flywire of the touch buttons. Also, the center of the screen's appearance should not be centered on the front cover of the small TV (to ensure the screen display area aligns with the opening in the cover). After inserting the screen into the slot, close the back cover.
 
 
 
Project Defects (Known Bugs):
1. The EC-01G module has GPS positioning capability, but (possibly) it cannot be used quickly due to signal issues.
2. The shell structure has average strength and tends to yellow after prolonged use. A white, semi-transparent 3D printing material with good weather resistance needs to be found.
3. After waking up, the system determines whether it is an automatic wake-up at midnight by comparing the alarm clock setting and the RTC time. If the button switch time happens to coincide with the alarm wake-up time, the program will malfunction.
4. The time obtained from network synchronization includes network latency, causing a difference of a few seconds between the internal time of the small TV and the actual time.
5. The desktop pet lacks continuity between different animations and has no interactive capabilities.
6. The drivers for the WIFI/Bluetooth and NB-IoT modules are still significantly incomplete and do not yet support true multi-threaded operation.
7. The program architecture does not allow automatic re-acquisition of information after a Wi-Fi disconnection and reconnection.
8. … (There are still some issues)
 
The main project code is being organized, and
 
attached images will be uploaded within a few days:
1. Disassembly diagram
2. Copper foil tape and soldered traces for the touchscreen (ignore the adjacent flying wire chip; this is an older version of the PCB and does not yet integrate the AT24C08)
3. Back of the motherboard and the attached antenna
4. Antenna connection method; when attaching the antenna, ensure the connector is aligned correctly.
Other images include overall appearance and renderings.
 

PCB.zip

Download Algorithm.zip

Shell.zip

Main project code (incomplete, contains major bugs, but usable). 7z

PDF_STM32-based Mini TV Desktop Clock - Weather Display - Desktop Pet.zip

Altium-based STM32 mini desktop clock with weather display and desktop pet. zip

PADS_STM32-based Mini TV Desktop Clock_Weather Display_Desktop Pet.zip

BOM_STM32-based Mini TV Desktop Clock_Weather Display_Desktop Pet.xlsx

97294

[Verified] Minila Keyboard - Starlight 67

A 60% layout wired single-mode programmable keyboard suitable for programmers, based on the STM32F103RBT6, using vial firmware based on qmk.

This document introduces
a wired single-mode keyboard based on the STM32F103RBT6, with 60% layout and lower LED positions, using the Vial firmware based on QMK.
For details, please see the Bilibili video: https://www.bilibili.com/video/BV1XH4y1d7i2/
Verification:
The keyboard has been tested and soldered, and has been used for over a month.
Firmware Description :
Bootloader
is attached (generic_boot20_pc13.bin
, downloaded from https://github.com/rogerclarkmelbourne/STM32duino-bootloader ) . Vial configuration
is attached (starlight_rev1_vial.bin)
. Basic Usage: The left and right sides of the large spacebar are layer toggles. After configuring the TAP_DANCE function, clicking triggers the spacebar, long-pressing switches to a layer, double-clicking switches to layer 2, and pressing simultaneously switches to layer 3. Layer 1 is the key combination and FN layer. The arrow keys control the mouse cursor; the left arrow key (Del) triggers a left mouse click, and the right arrow key (Shift) triggers a right mouse click. Layer 2 is the lighting control layer. Layer 3 is a custom macro layer. The buttons in the lower right and upper right corners are VIAL unlock buttons. Note that layer 0 is the default input layer, and the "|" key in layer 1 is the light switch; the light is off by default. The two spaces that appear after programming do not have key codes by default; it is recommended to configure TAP_DANCE or a simple layer switching function. The PCB is compatible with common plastic housings on the market, but due to interference from the bottom light position, part of the bottom support needs to be cut off with tools.








 

generic_boot20_pc13.bin

starlight_rev1_vial.bin

starlight_vial_rev1.vil

PDF_【Verified】minila layout keyboard - Starburst 67.zip

Altium_【Verified】minila layout keyboard - Starburst 67.zip

PADS - [Verified] Minila Keyboard Layout - Starlight 67.zip

BOM_【Verified】minila layout keyboard - Starburst 67.xlsx

97295

Traffic light system based on 51 microcontroller

The first practice project

I. Project Overview: This project
      designs a traffic light system based on the 51 microcontroller. It uses two 0.56-inch common cathode LED displays to show the remaining seconds of red (green) lights in different directions. An infrared tracking module is used to detect pedestrians crossing the red light. Four sets of red, yellow, and blue LEDs simulate the traffic light status. An LCD1602 displays other information. A button module is used for information interaction (setting red light duration, whether to perform pedestrian crossing detection, etc.). The reset button, serial port circuit, all pins, VCC, and GND are all brought out for easy secondary development and the addition of peripherals.
II. Onboard Resources
1. Main Control Chip: STC89C52RC; 2. Power Interface: DC, 2-pin connector; 3. LEDs: One power indicator, one infrared module status indicator, four sets of red, yellow, and green LEDs;
4. Buttons: One reset button, four function buttons; 5.
Debugging Interface: Serial port download and debugging interface, using a 2.54mm header connector;
6. Peripherals: Two 0.56-inch common cathode digital tubes, one infrared tracking module, one passive buzzer, one LCD1602; III . Advantages and Features 1. JLCPCB provides free PCB fabrication, 100mm*100mm; 2. Complete debugging interfaces, all pins are brought out for easy testing and secondary development, can be used as a core board; 3. Uses DC interface or header power supply; 4. Affordable price, complete functionality; 5. Uses high-quality JLCPCB PCBs and genuine components to ensure product quality; 6. Almost all components are through-hole (except for two capacitors and transistors, all are through-hole; surface mount technology can be used to reduce area); IV. Circuit Analysis Diagram 4.1 Traffic Light System Schematic Diagram IV. Physical Verification Scheme Breadboard Verification Board Making Physical Image Finished Product Image Due to incorrect component selection, flying wires appeared, which have been corrected. The scheme has been successfully verified. Since the source code is borrowed from someone else, it will not be uploaded here. If needed, you can contact me privately for it, or refer to my desktop clock. The idea behind this code is optimized from that.
 









 
 

 

 

 


 
 

BOM_Board1_PCB1_2023-07-02.xlsx

Altium-based Traffic Light System (based on 51 Microcontroller) - 2023-11-04.zip

PDF_Traffic Light System Based on 51 Microcontroller.zip

Altium-based Traffic Light System (based on 51 Microcontroller).zip

PADS_Traffic Light System Based on 51 Microcontroller.zip

BOM_Traffic Light System Based on 51 Microcontroller.xlsx

97296

electronic