This example requires an ethernet shield and an LED connected to pin 6. Copy the code into a new sketch and upload it to your arduino and then open your web browser to   Code [c] #include <SPI.h> #include <Ethernet.h> #include <Servo.h> Servo myservo; ...

Connect an LED to digital pin 3 Code [c] void setup() { pinMode(3, OUTPUT); } void loop() { for (int a = 0 ; a < 256 ; a++) {.

The ability to flash an LED is the most basic 'hello world' type of program you can write and run on your arduino. Most Arduino's have an LED attached to.

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