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arduino-tips.md

关于串口（UART）：

  1. 波特率表示每秒钟传输多少bit信息，如9600，则一bit约0.1ms，及100微秒左右，可以在示波器中看到
  2. 信息格式为0 + 8bit信息 + 奇偶校验位（可选），信息传输顺序为从低位到高位， 10000010 即为 01000001，即16进制的41，10进制的65，即字符A
  3. Arduino 只有一个串口Serial，想使用Serial1就要用SoftwareSerial
  4. 如果串口（0， 1）接了传感器，有可能会上传代码失败，这是把接的设备去掉即可
  5. 操作LCD设备，发现只有LiquidCrystal_I2C这个好用些，如果在循环在某一行中写数据，需要先clear，否则会重影

Arduino的编辑器不好用，可以使用vs code来做开发： https://www.dmcinfo.com/latest-thinking/blog/id/9484/arduino-programming-with-vscode

PMS 7003的库 https://github.com/fu-hsi/PMS

i2c LCD库 https://github.com/marcoschwartz/LiquidCrystal_I2C

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