The Arduino Editor provides a great example for blinking a LED. There's no need to type anything, just click in the following in the Arduino Editor: File > Examples > 1.Basic > Blink


Next, we want Arduino to know what Board is being used currently. To do this, navigate to Tools > Board > Arduino/Genuino Uno


Lastly, we need to upload the program. To do this plug the Metro board into your USB port. Then select the proper port in Tools > Serial Port > (the Serial/COM port of your metro). Next upload the program by going to Sketch > Upload (or press ctrl+u on your keyboard)

After uploading to the Metro, you should see the LED on both the Metro and the breadboard blinking. 


If you have trouble loading the Blink Sketch from Arduino's examples, you can copy and paste the code below into the editor. 

  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO 
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino model, check
  the Technical Specs of your board  at
  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second

Having issues with CIRC01?

LED Not Lighting Up?

LEDs will only work in one direction. Try taking it out and twisting it 180 degrees. (no need to worry, installing it backwards does no permanent harm).

Program Not Uploading?

This happens sometimes, the most likely cause is a confused serial port, you can change this in tools>serial port>

This guide was first published on Aug 18, 2017. It was last updated on Jun 12, 2017.

This page (Code ) was last updated on Jun 13, 2017.

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