Portable handheld hair dryer

======WARNING======
The BOM (Bill of Materials) should be based on the schematic diagram! Do not use the BOM
in the project description directly! The BOM should be based on the schematic diagram! Do not use the BOM in the project description directly!
The BOM should be based on the schematic diagram! Do not use the BOM in the project description directly!
Please follow the CC-BY-NC-SA 3.0 open-source license. This project is for learning and research purposes only and is prohibited for commercial use.
Electronics exchange groups: 232586710, 345731137
Introduction video: https://www.bilibili.com/video/BV1aN4y1X7Rg/
Integrated speed control switch, separate battery and fan design.
Powered by a 4s battery, the fan's full-load current can reach over 20A
, therefore a high-discharge-rate power battery is required,
such as the Samsung 40T Lishen LA or other high-discharge-rate power batteries.
The fan system uses an XFly 40mm 12-blade ducted motor (click the text to go to the purchase link).
It requires three boards: a lithium battery charging board, a lithium battery protection board, and a brushless ESC speed control board.
Charging board: https://oshwhub.com/wzw666/2368 mini
Protection board: https://oshwhub.com/wzw666/bm3451
 
The battery and fan are separate, allowing for multiple batteries.
 
The ESC is attached to the air outlet with double-sided tape to facilitate heat dissipation; a Little Bee 30A ESC is recommended.
 
It is recommended to use a high-rate power battery, such as Samsung 40T or Lishen LA.
 
The rotary switch integrated brushless ESC PWM signal speed control board
is modified from the 712897A brushless ESC PWM signal generator.
Project link: https://oshwhub.com/712897a/stc8g1k08a_pwm
Download Options
Note: The IRC frequency must be selected as 12MHz
. There is no automatic reset circuit. After clicking download, you need to disconnect the power supply (it is recommended to unplug GND and then reconnect it). The download will only start after the chip is powered on again.