打算实现的功能有：
锂电池充电
TF卡（SPI模式）
Grove接口
feature of M5Atom Battery expansion card：
Li-on battrey charging
support for TF card(SPI mode)
Grove interface
项目随后会在GitHub上发布
Later will post on GitHub
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Try to design a M5Atom Battery expansion card! 试着去给M5Atom设计个电池拓展底板posted in PROJECTS