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add faq08 - FACES Error
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# FAQ {docsify-ignore-all}
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**[Core](#Core)** **[Unit](#Unit)**
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**[CORE](#CORE-Question)** **[UNIT](#UNIT-Question)**
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## Core
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## CORE Question
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- **Q1: What's the difference between those Cores?**
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Restart this Stick and then it can display correctly. Because the code to read the MPU9250 is placed in the setup() function which only was executed once when booting. So reboot and let the Stick detect MPU9250 again.
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## Unit
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- **Q8: After getting the FACES Kit or downloading the factory program of the FACES Kit, the following error is displayed on the screen. What happened?**
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<img src="assets/img/faq/faq_08_01.png" width="100%" height="100%">
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This is normal, because there is no main.py file in the program, so this warning is available.
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## UNIT Question
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- **Q1: What is the difference between the various cameras of M5Stack?**
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# 常见问题解答 {docsify-ignore-all}
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**[主控](#主控)** **[单元](#单元)**
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**[CORE](#CORE-Question)** **[UNIT](#UNIT-Question)**
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<!-- **[主控](#主控)** **[模块](#模块)** **[底座](#底座)** **[单元](#单元)** -->
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## 主控
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## CORE Question
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- **Q1: 这些 M5Core 之间有什么区别?M5Stick 之间也有什么区别?**
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<img src="assets/img/faq/faq_03.png">
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<!-- 可能是堆叠之后,底座上的 M5-Bus 总线上的左下角的引脚 BATTERY 与 M5Core 接触不太好,这是生产时焊接位置偏了导致的。总线排针焊接位置稍微偏了一些之后,容易出现 BATTERY 引脚与 M5Core 接触不好。 -->
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**原因和解决方案:**可能是因为这些串口的供电电流不够大,需要在主控中的 RST 引脚和 GND 引脚之间接入电容 ( 电容值是比0.1uF大的 ),或者在下载程序的时候,将 GPIO 0 连接到 GND,使得 GPIO 0 能持续足够的低电平。
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<img src="assets/img/faq/faq_05.png" width="80%" height="80%">
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重启这个 Stick,就可以显示。因为读取 MPU9250 的代码放置在出厂程序的 setup() 函数中,开机只执行一次,所以重启,让 Stick 再检测一次 MPU9250。
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## 单元
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- **Q8: 刚拿到 FACES Kit 或者烧录了 FACES Kit 的出厂程序之后,屏幕上显示如下的错误,是怎么回事。**
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<img src="assets/img/faq/faq_08_01.png" width="100%" height="100%">
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这是正常现象,因为程序里面有没main.py文件,所以才有这个警告。
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## UNIT Question
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- **Q1: M5Stack 的多款摄像头 Unit 之间有什么区别?**
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- **Q2: 摄像头通过 WIFI 传输图像给手机,能传输多远?**
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经过测试,在室内使用 M5Camera 能传输 20 米左右。
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<!-- 可以多个电池堆叠在一起吗? 可以 -->
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<!-- ### Minicore
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### 套件
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## 功能模块Modules
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#### 通信模块
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#### 拓展模块
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#### 驱动模块
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## Units
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### 通信类Unit
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### 传感类Unit
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### 驱动类Unit -->
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<!-- ---
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- Q. USB插入Core之后,识别不到串口号?
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- A. 这些Core主要区别在内部硬件配置和套件搭配上,从基础版到升级版,分别是增加了运动传感器和加大了RAM和FLASH,具体区别请访问这个链接
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https://github.com/m5stack/M5-Schematic/blob/master/Core/hardware_difference_between_cores.md
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- Q. 有些模块与Core堆叠之后不能下载程序,比如USB模块与Core堆叠
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- A. 可能是堆叠之后,接触不好,M5-Bus总线有GPIO0,接触不好的时候,GPIO0的时序不对,下载的时候要手动GPIO0连接GND,保证足够长时间拉低
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--- -->
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