This is a circuit that allows you toggle between three different components, in this case LEDs, by pressing a button. The cycle advances each time you press the button: (1) turns all off, (2) turn red on, (3) turn yellow on & red off, (4) turn green on &yellow off, (1) turns all off again, and repeats.

Please note that I have entered this instructable into the ROBOTICS contest, so please vote for it!

## Step 1: Acquire Parts

You will need:

> a push button

>1kΩ resistor (brown-black-red)

>3 elements to control (I'm using LEDs)

>3 220Ω resistors (red-red-brown)*

*Only if you are using LEDs as your elements to control

## Step 3: Wiring

Wire as follows: (or look at the picture)

>Pushbutton goes to 5v, and digital pin 2 and ground through a 1kΩ resistor

>Component 1 goes to digital pin 5, and ground

>Component 2 goes to digital pin 7, and ground

>Component 3 goes to digital pin 9, and ground

Here is the code:

```int switchPin = 2;
int led1Pin = 7;
int led2pin = 9;
int led3pin = 5;
int val;
int val2;
int buttonState;
int Mode = 0;
void setup() {
pinMode(switchPin, INPUT);
pinMode(led1Pin, OUTPUT);
pinMode(led2pin, OUTPUT);
pinMode(led3pin, OUTPUT);
}
void loop() {
delay(10);
if (val == val2) {
if (val != buttonState) {
if (val == LOW) {
if (Mode == 0) {
Mode = 1;
} else {
if (Mode == 1) {
Mode = 2;
} else {
if (Mode == 2) {
Mode = 3;
} else {
if (Mode == 3) {
Mode = 0;
}
}
}
}
}
}
buttonState = val;
}
if (Mode == 0) { // all-off
digitalWrite(led1Pin, LOW);
digitalWrite(led2pin, LOW);
digitalWrite(led3pin, LOW);
}
if (Mode == 1) {
digitalWrite(led1Pin, HIGH);
digitalWrite(led2pin, LOW);
digitalWrite(led3pin, LOW);
}
if (Mode == 2) {
digitalWrite(led1Pin, LOW);
digitalWrite(led2pin, HIGH);
digitalWrite(led3pin, LOW);
}
if (Mode == 3) {
digitalWrite(led1Pin, LOW);
digitalWrite(led2pin, LOW);
digitalWrite(led3pin, HIGH);
}
}

```

This code was made byThat1guy99* and tweaked by me.

*See it here: http://forum.arduino.cc/index.php?topic=124707.0

<p>Nice idea. One suggestion for a future project: can you make it so that a &quot;double click&quot; does something, a single click another, a long click and hold another? Should be doable, no?</p>