// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin 13 as an output.
pinMode(13, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(13, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
And click upload! That's it, you will be able to see the LED blink rate change as you
adapt the delay() calls.
Manually bootloading
If you ever get in a 'weird' spot with the bootloader, or you have uploaded code that
crashes and doesn't auto-reboot into the bootloader, double-click the RST button to
get back into the bootloader. The red LED will pulse, so you know that its in
bootloader mode. Do the reset button double-press right as the Arduino IDE says its
attempting to upload the sketch, when you see the Yellow Arrow lit and the Uploadin
g... text in the status bar.
Don't click the reset button before uploading, unlike other bootloaders you want this
one to run at the time Arduino is trying to upload
©Adafruit Industries
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