Esp32C3 Learning Board

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PDF_C3 Learning Board.zip

Altium_C3 Learning Board.zip

PADS_C3 Learning Board.zip

BOM_C3 Learning Board.xlsx

96050

Four-layer board STM32F103C8T6

STM32F103C8T6

The four-layer board has been tested and is working properly.

cc997760ab4775ff0daf992a5aa9eb7e.mp4

PDF_Four-layer board Stm32f103c8t6.zip

Altium 4-layer board Stm32f103c8t6.zip

PADS_4-layer board Stm32f103c8t6.zip

BOM_Four-layer board Stm32f103c8t6.xlsx

96054

5V12A step-down module

Built using the Chipone XL4016... seems pretty good, cheap and easy to use.

There are several unused 12V server power supplies. There aren't many things that require 12V power, but many require 5V, so I made this
 
module. The heat generation after half an hour of 5A output
and the ripple at 5A output were observed
 
 
. At full power (12A) with a fan, it's manageable, but the ripple increases.
 
The ripple at 12A output
 
 
 
seems acceptable in the tests. The load test results on the host computer are also very stable.
However, it's worth noting that if this module fails, it will directly output the input voltage. USB devices are quite voltage-sensitive, so some protection circuitry should be added.
 
 

PDF_5V12A Step-Down Module.zip

Altium_5V12A step-down module.zip

PADS_5V12A step-down module.zip

BOM_5V12A Step-Down Module.xlsx

96056

Multifunctional bottled water heater

It can be used to heat bottled water, as a night light, as a heater, and as a pen holder; it's very practical.

Used for heating bottled water, this device can also be used as a nightlight, a heater, and a pen holder—very practical.
The design theme is rocket-themed, and it looks quite attractive from top to bottom. The bottom features four LEDs for illumination and colorful PCB silkscreen printing, making it quite aesthetically pleasing.
The entire shell is 3D printed, reinforced by four supports, maintaining a certain thickness and using substantial materials.
The heating element uses a carbon fiber heating module, which is very practical and available for around 3 RMB on Taobao. Because the heating is very slow, there's no need to worry about overheating.
See the attachment for the 3D design results.
The electronic circuitry consists of three main parts:

a power interface circuit (powered via a Type-C interface, supplying power to the logic and lighting circuits)
, a control logic circuit (using a C51 microcontroller to control the LEDs and heating plate), and a
lighting circuit (using colorful silkscreen printing and four LEDs for internal lighting).

All these parts need to be fixed inside the heating tank.
The control logic circuit has an opening on the panel for operation.
The heating container can hold standard-sized purified water and mineral water, heating it to around 40 degrees Celsius, which is perfect for drinking.
Finally, it's given to the children to draw on.