Step 1: Flashing Lights
Assemble the circuit as pictured in circuit_basic.png
. You can connect LEDs to pins 3-13, but the example uses 5 LEDs to start. You can use any colored LEDs that you want. Notice that they have a long leg and a short leg - the long leg should be connected to the digital pin, and the short leg should be connected to the ground line (with a wire from GND running to it.) The resistor can either be between the digital pin (power) and the LED, or between the LED and ground. Each resistor should be around 220 Ohms.