A small program that uses the Metro library to fade one LED while blinking another

metroFadeBlink.ino

#include <Metro.h> // Include Metro library

const int ledPin1 = 13;
const int ledPin2 = 10;

// Create variables to hold the LED states
boolean ledState = HIGH;  //boolean variables only hold 2 values, true or false (also equal to high or low on Arduino)
int ledBrightness = 0;

int fadeAmount = 5; //the amount to fade each time we execute a fade 

//create metro objects, one for each action we want to do (one for blink and one for fade)
Metro blinkMetro = Metro(1000); 
Metro fadeMetro = Metro(20); 

void setup(){

  //set our ledPins as outputs
  pinMode(ledPin1,OUTPUT);
  pinMode(ledPin2,OUTPUT);
}

void loop(){

  if (blinkMetro.check()) {  //check the blink timer to see if we need to blink

    ledState = !ledState;  //flip the value of ledState (if it was high/true, set it to low/false, and vise versa)

    digitalWrite(ledPin1, ledState);  //change the state of the led pin
  }






  if (fadeMetro2.check()) {  //check the fade timer to see if we need to fade

    ledBrightness2 = ledBrightness2 + fadeAmount2; // change the brightness value for next time through the loop by incrementing the current brightness by fadeAmount

    // reverse the direction of the fading at the ends of the fade (ie if fade amount is 5 while fading up, make it -5 while fading down): 
    if (ledBrightness2 <= 0 || ledBrightness2 >= 255) {
      fadeAmount2 = -fadeAmount2 ; 
    }     

    analogWrite(ledPin3, ledBrightnes2);    // set the brightness of pin 20
  }

  

}