[Summer Must-Have] Better violent fans

Change log

2020/5?/1:: When I saw the collection order was extended, I took advantage of it.

2020/5/5: Used most of the original circuit directly and finished it in two hours

2020/5/6:pcb board making

2020/5/10: Received the pcb (but there is no time for express delivery, and the components have not been purchased yet)

2020/5/14: Place the next component

2020/5/21: All completed

2020/5/23: Lichuang’s 1 yuan free fan is so fragrant  It doesn’t matter whether you do this thing or not.

Features

• Single lithium high-power solution, compact size, strong wind power
• Support power display
• Integrated battery protection chip to prevent over-discharge
• Using IP5306, the charging heat is small and the voltage boost is more stable.
• The charging current is as high as 2A, and the heat generation is small. The current exceeds the 500mA or even 300mA solutions on the market.
• With stepless speed regulation function, non-external PWM method (requires fan support)
• Shut down "0" power consumption, effectively extending battery life (current is very small, a few uA)

Soldering video link (strongly recommended platform supports iframe) forum post