3 Different way of connecting a push button to Arduino

INTRODUCTION

In this chapter, we are going to learn the three different way of connecting a push button with Arduino microcontroller.

3 Ways

• Internal pull-up resistor
• External pull-up resistor
• External pull-down resistor   

Internal pull-up resistor

• Connect the push button with Arduino as shown in the circut ie,
• Connect one terminal of the push button to any digital pin of Arduino in my case I'm using digital pin  D5
• Then connect the other terminal of the push button to the ground of Arduino.
• Now upload the below code.

Code

Result

• By default, the pin state will be HIGH.
• When we press the push button the pin state will change to LOW.

External pull-up resistor

• Connect one of the terminal of the push button to any digital pin of Arduino, in my case I have used digital pin 5.
• Connect the other terminal of the push button to the ground of Arduino.
• Then connect a resistor of value 10 Kohms from the digital pin which you have connected the push button to the 5v of Arduino, in my case I have connected the resistor form digital pin 5 to 5v.
• Now upload the below program.

Code

Result

• By default, the pin state will be HIGH
• When I press the push button the state will change to LOW.

External pull-down resistor   

• Connect one of the terminal of the push button to any digital pin of Arduino, in my case I have used digital pin 5.
• Then connect the other terminal to the 5v of Arduino.
• Then connect a resistor of value 10 Kohms from the digital pin which you have connected the push button to the ground of Arduino, in my case I have connected the resistor form digital pin 5 to ground.
• Now upload the below code.

Code 

Result

• By default, the pin state will be LOW
• When we press the push button the state will change to HIGH from LOW

Video