How to Use a Push Button Switch With Arduino

Intro: How to Use a Push Button Switch With Arduino

This is an Instructable that tells you how to connect a 4 pin push button switch with the Arduino.
The contraption allows an LED to be switched on when the push button is pressed.

STEP 1: What You Need:

You need:

A push button switch
Arduino
1 Resistor (any value), I used a 220 ohm one.
2 Jumper cables(breadboard jumpers)
1 Breadboard (to make it easy)
LED

STEP 2:

1. Put the switch in the breadboard and put an LED with the longer end into pin 13 and shorter end to the Gnd of the Arduino.

STEP 3:

Put the resistor with one end in +5 V and the other end connected with one of the terminals of the switch.
Connect the other corresponding terminal to Gnd. The corresponding terminal is usually on the same side as the first one.

STEP 4:

Connect the first terminal (the one with the resistor) to pin 2 on the Arduino and load the program:

int d=2;   // to store on or off value
void setup()
{pinMode(2,INPUT);
pinMode(13,OUTPUT);

}
void loop()
{
d=digitalRead(2);
if(d==0)
{digitalWrite(13,HIGH);}
else
{digitalWrite(13,LOW);}
}

STEP 5: You Are Done!!

Now just press the switch and the LED will light up!

Comments

[KumaranK6]

I am kumaran and a teacher in jaffna srilanka. i am interested to aurdino. but i am a mathematics teacher and plz help for this purpose.
in 8*8 matrix i push the button change the english letter.
example press button display A then press button display B then.....
if you pleace help the code for this.
plz send me

[vermasunny]

I dnt have sufficient knowledge abt electronics so I want to know why Connect the first terminal (the one with the resistor) to pin 2 on the Arduino ? tell me anyone

[Flame Kaiser]

U can connect it to any pin analog or digital

[VitaliyMysechko]

Hi!
Thanks for the nice example.

Why I have "1" on the input D2 while the button is not pressed (Serial monitor from Arduino IDE shows it )? It seems that input is inverted - it shoud have "0" when it is no current or "1" when we have it (button pressed) - but I have oposite situation!

On the other side - HIGH means "1" for me and we have LED bright with HIGH flag for the output D13....So it is normall behaviour...

Please explain!

[evdschepop]

Thanks!!

[mirzaa11]

Push putton can be of 6 terminal then how it will be connected

[Codingpro]

cool. thanks, it is a good help for one of my big projects.

[Firebolts]

Hey i completed this but have a question. I just got the Arduino UNO starter pack so i have a small breadboard and button. It did not always answer to my button and sometimes went out. Is there a way to do it on a smaller scale.

[ironheartbj18]

There is insufficient the code details not sure how you get the change from blue to green. it does not make any sense if high will change to blue change blue or red. it got me suspect. what kind of you were using the led.

[sidgupta]

Dude. That's just a color changing LED. There's no programming needed to change color. It does that on it's own.
If you'd used a blue/green/red LED instead it wouldn't have changed color.

[Adhanala]

Thanks, I wanted to know how can i light the led up for longer than few seconds.

[sidgupta]

Hi!
Sorry for the late reply.
Add a small delay. If you want to keep it on for ten seconds then put the delay as 10000 (10,000 milliseconds)
Example:
void loop()

{
d=digitalRead(2);
if(d==0)
{digitalWrite(13,HIGH);delay(10000);}
else
{digitalWrite(13,LOW);}
}

[Ryanj2000]

Thanks, I am making a project involving buttons and leds. This helped a lot.