sparkfun ESP8266 - Page 16

Then select your FTDI’s port number under the Tools > Port menu.
Upload Blink
To verify that everything works, try uploading the old standard: Blink. Instead of blinking pin
13, like you may be used to though, toggle pin 5, which is attached to the onboard LED.
COPY CODE
#define ESP8266_LED 5
void setup()
{
pinMode(ESP8266_LED, OUTPUT);
}
void loop()
{