#include <Ticker.h> //调用Ticker.h库

Ticker ticker1; //声明Ticker对象
Ticker ticker2; //声明Ticker对象

void callback1() //回调函数1
{
  Serial.print(millis());
  Serial.println("  回调函数1已启用");
}

void callback2() //回调函数2
{
  Serial.print(millis());
  Serial.println("  回调函数2已启用");
}

void setup()
{
  Serial.begin(115200);
  Serial.println();

  ticker1.attach(0.5, callback1);   //每0.5秒调用callback1
  ticker2.once_ms(2000, callback2); //2000毫秒后调用一次callback2
}

void loop()
{
}