pro micro 5v 16m 要選 “SparkFun AVR Boards”

https://www.twblogs.net/a/5d405406bd9eee5174230772

一、下載開發板定義

先在Arduino IDE中，點擊“文件”→“首選項”，在“附加開發板管理器網址”當中輸入以下內容並保存

https://raw.githubusercontent.com/sparkfun/Arduino_Boards/master/IDE_Board_Manager/package_sparkfun_index.json

然後在IDE主界面點擊“工具”→“開發板……”→“開發板管理器”，安裝“SparkFun AVR Boards”
最後在“工具”→“開發板……”中選中“SparkFun Pro Micro”，並在“處理器……”中根據板子尾部晶振上標註的頻率選中對應的處理器即可（一般是ATmega32U4 5V 16MHz）

二、引腳定義

如下圖：

   

測試程式:
***********************************************
int RXLED = 17;  // The RX LED has a defined Arduino pin
// The TX LED was not so lucky, we'll need to use pre-defined
// macros (TXLED1, TXLED0) to control that.

void setup()
{
 pinMode(RXLED, OUTPUT);  // Set RX LED as an output
 // TX LED is set as an output behind the scenes

 Serial.begin(9600); //This pipes to the serial monitor
 Serial1.begin(9600); //This is the UART, pipes to sensors attached to board
}

void loop()
{
  Serial.println("Hello world");  // Print "Hello World" to the Serial Monitor
  Serial1.println("Hello!");  // Print "Hello!" over hardware UART
 digitalWrite(RXLED, HIGH);   // set the LED on
 //TXLED1; //TX LED is not tied to a normally controlled pin
 delay(1000);              // wait for a second
 digitalWrite(RXLED, LOW);    // set the LED off
 //TXLED0;
 delay(1000);              // wait for a second
}
***********************************************