Three data lines drive a 20-character (5 HPDL-1414) display module, compatible with the SPI protocol. More information about this project can be found at [20-character (HPDL-1414*5) display module (serial protocol, SPI compatible)](https://hadongzhu.com/archives/711). The driver is open-source on Github (https://github.com/hadongzhu/HPDL1414x5_Driver).
Portable fan with 3 adjustable fan speeds and powered by a single 18650 motor.
This project is a portable fan powered by an 18650, integrating lithium battery charging management and protection, and featuring 3 adjustable fan speeds. It is a pure hardware design.
Brief functions include:
0.6A lithium battery charging,
9V motor drive control, 3 adjustable fan speeds (5.4V for speed 1, 7.3V for speed 2, and 9.2V for speed 3),
a single-button switch for
charging and a full charge indicator
light, and a fan operation indicator light
. Note: When a charger is connected, a short press of SW1 will keep the fan operating at speed 1, with the fan light and charging light illuminated.
To ensure the charging current can properly supply the fan's rotation during charging, the fan will only operate at speed 1. SW1 will then function as a switch instead of a speed switch; it will only control the fan's on/off state during charging and cannot be used for speed switching. Regardless of the operating speed, connecting to a charger will automatically switch the fan to speed 1, and the fan will return to speed 1 after charging is removed.
BOM (Blow-out version):
CM3*16 x4 (for fixing the fan and housing)
M2*3 x4 (for fixing the PCB)
M2*2*3.5 thermosetting nuts x4 (for fixing the PCB)
18650 lithium battery x1
6015 fan x1 (I used a 5V fan; please test other models yourself)
PCB x1
Housing x1 set
If you find the front monotonous, you can attach a panel to it
for testing. The silent fan's airflow is average, while the non-silent one is quite noisy, and the airflow isn't particularly strong. Therefore, it's currently used as a welding smoke extraction fan.
Actual product image
and assembly diagram .
Note: The grooves at the screw holes below the fan correspond to the protrusions on the housing for installation (as shown in the picture).
VID_20240528_145620.mp4
faceshell.stl
bottom shell .stl
button.stl
Bottom shell (integrated button version, not yet verified).stl
PDF_Three-speed adjustable portable fan.zip
Altium_Three-speed adjustable portable mini fan.zip
PADS_Three-speed adjustable portable mini fan.zip
BOM_Three-speed adjustable portable mini fan.xlsx
94456
RGB heart-shaped flowing light
RGB heart-shaped flowing light
The 3D effect demonstration
is rather brief, please forgive the limited detail!
Soldering Precautions:
This document mainly focuses on surface-mount components, and the LEDs are machine-mount packages, making manual soldering somewhat difficult.
The Type-C interface uses a 6-pin through-hole package; the leads need to be flattened during soldering. The power switch also uses a 6-pin through-hole package, which also requires flattening before soldering!
Since there is no pre-installed download interface or download circuit on the board, downloading is also somewhat difficult and requires jumper wires.
Component Purchase Recommendation : For
RGB LEDs, you can use this link: https://item.taobao.com/item.htm?_u=23p15f8t0489&id=590715849209&spm=a1z09.2.0.0.67002e8deIJSIH&skuId=4222664047588
14.hex
PDF_RGB Heart-Shaped Flowing Lights.zip
Altium_RGB Heart-Shaped Flowing Light.zip
PADS_RGB Heart-Shaped Flowing Light.zip
BOM_RGB Heart-Shaped Flowing Light.xlsx
94457
electronic
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