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为什么底层的地址和设备地址不一样？
I2C地址的最后一位是读写位，手册里写的是0x52（写）或者0x53（读）
OpenMV，Arduino或者很多库把地址右移一位，就不需要管理读写地址了。
>>> hex(0x52>>1) '0x29'
用i2c.scan()搜一下可以得到地址。
https://www.bing.com/search?q=i2c地址+7位&qs=SC&pq=i2c地址+&sk=SC1&sc=8-6&cvid=4C61AC4A011F4036A9A5E179151E959F&FORM=QBRE&sp=2