[Summer Must-Have] Handheld Violent Fan

Change log

2019/9/10: I had this idea when I was in school and started the project

2019/9/15: The first version was made, using multiple independent modules of Taobao to perform their own duties, and the lines were confusing.

2020/3/5: The epidemic made me bored, so I started production

2020/3/12: The first version is made, there are errors in pwm and 5v input.

2020/3/24: The second version was successful, with optimized size, layout, and reliability.

2020/4/24: Remade shell model

original intention

When I was in school, the classroom was very stuffy, and the window happened to be in the east-west direction... which only added fuel to the fire, so I came up with the idea of ​​making a cooling product.

Features

• Single lithium high-power solution, compact size, strong wind power
• Integrated battery protection chip to prevent over-discharge
• The charging current is as high as 2A, surpassing the 500mA or even 300mA solutions on the market.
• With stepless speed regulation function and no external PWM (requires fan support)
• Shut down "0" power consumption, effectively extending standby time (current is very small, a few uA)
• Comes with power bank function, maximum output capacity 2A (need to short-circuit D+, D-, PCB has been short-circuited)

My post on Digital Home

Note: It is recommended to modify the shell model file according to your own model