Every step will have the code, the schematic ... You can use an external one or use the one soldered on the board (pin 13). Turn ON an LED Sketch This is a very simple arduino project where a led is ...

This code looks for interrupts on “interrupt pin 0” (D2) of the Arduino to control the onboard indicator at its output (D13). #define LED_PIN 13 #define INTERRUPTPIN 0 volatile boolean state = HIGH; ...

At first glance, an Arduino library ... update method on the LED periodically. Here is one of the examples from the project: #include <jled.h> // connect LED to pin 13 (PWM capable).

Let it hit your red LED and you’ve lost a point ... Inside the cool laser-cut box is an Arduino Uno and a 9V battery, plus a current-limiting resistor and the all-important buzzer.