This example demonstrates how to use Serial input to control LEDs

Step 1: Adding an LED

1. Place an LED (any color) into the breadboard

2. Connect one end of 220 Ω (ohm) resistor to the top lead (+), should be the longer lead, and the other end into Pin 3 on your Arduino Board.

3. Connect a Jumper Wire to the bottom lead (-) and to the grounded rail on the breadboard.

4. Connect a Jumper Wire from the grounded rail to the GND (ground) Pin on the Arduino.

Step 2: LED Errors

The green LED has the same setup as our red LED.

1. Connect the led to the breadboard.

2. Connect a 220Ω resistor to the positive(+) lead of the LED and to a Pin 5 on the Arduino.

3. Connect the negative lead to the ground rail.

The red LED has the same setup as our blue and green LEDs.

1. Connect the led to the breadboard.

2. Connect a 220Ω resistor to the positive(+) lead of the LED and to Pin 9 on the Arduino.

3. Connect the negative lead to the ground rail.

Attached is the SerialDemo.ino which contains all of the code for running the binary counter project on an Arduino Uno.