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Update README.md
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FASTSHIFT authored May 20, 2022
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* 注意**D2**二极管方向,方向是和其他二极管相反的。否则会发生开机一段时间自动关机的情况。
* GPS模块需要由**HT1818Z3G5L**更换为**ATGM336H**(购买链接在下方),否则外壳放不下。关于接线,GPS模块的**TX**脚接板子的**T焊盘**,**RX**脚接板子的**R焊盘**。注意GPS的天线**不要**碰到旁边的法拉电容,否则导致模块发热且收不到信号。
* 地磁计**LIS3MDL**和加速度计**LSM6DSM**在该系统中作用不大,又由于芯片涨价导致整机成本过高,可以不安装。
* MCU: **AT32F403ACGU7**,如果定不到货,可以尝试[@johnsbark](https://github.com/johnsbark)设计的[改进版硬件](https://github.com/FASTSHIFT/X-TRACK/tree/main/Hardware/X-TRACK%20%E6%94%B9%E8%BF%9B%E7%89%88)方案(红框内的MCU都可以进行尝试)。
![_@~ (1`XC( S{MQFDXTSZQQ](https://user-images.githubusercontent.com/26767803/126936789-e303282b-f0cd-4758-b713-bd6ed797a0aa.png)
* MCU:**AT32F435CGU7****AT32F403ACGU7**
如果定不到货,可以尝试[@johnsbark](https://github.com/johnsbark)设计的[改进版硬件](https://github.com/FASTSHIFT/X-TRACK/tree/main/Hardware/X-TRACK%20%E6%94%B9%E8%BF%9B%E7%89%88)方案(红框内的MCU都可以进行尝试)。

![image](https://github.com/FASTSHIFT/X-TRACK/blob/main/Images/MCU%E9%80%89%E5%9E%8B/AT32F435.png)
![image](https://github.com/FASTSHIFT/X-TRACK/blob/main/Images/MCU%E9%80%89%E5%9E%8B/AT32F403A.png)

* 关于其他品牌MCU替换的性能需求: 主频 >150M,RAM >=200K,FLASH >=512K,SPI速度 >=50Mbps。

## 特殊器件购买链接
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