Scheme description：

The earphone charging bin of wireless earphone has two main functions: one is storage and one can be charged. Wireless Bluetooth headset due to the compact body, in the use of battery life is shorter. When not in use, you can put the headset into the charging bin to charge; When the battery is out of power, you can also supplement the power through the earphones placed in the charging port of the charging bay.

Function description：

Turn on the power and check the battery level of the charging bin. When the headphone is charged, the battery level of the charging bin decreases by 1% every 4 minutes. When the battery level of the charging bin is 19% lower than the detected level, the battery level does not decrease. The first time the headphone is detected in the bin, the power of the headphone is zero by default, start charging the headphone, and record the charging time, every 30 minutes the headphone shows the power plus 25% , the headphone 1 and 2 separate detection and timing. Until the two headphones are fully charged (four-cell power all-bright) , if there is no external power connected to USB, then the charging bin into a dormant state, the display screen.

Schematic diagram：

PCB diagram：

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