Arduino Tutorial Series : Lesson 04 - Using Push Button
In this tutorial we will learn how to read the state of a push button to control a LED.
In this sketch we check the button state in every loop and set the LED state.
What you need...
an Arduino
a Breadboard
a Push Button
10 kohm resistor
Hardware setup
In this setup we have used a 10k resistor to connect the input pin 2 to the ground at normal state. When the push button is pressed, pin 2 connects to 5v. This 10k resistor is called a Pull Down resistor. This ensures the voltage at pin 2 is 0v when puch button is not pressed.
Arduino Sketch
Download arduino sketch PushButton.ino
In this sketch we check the button state in every loop and set the LED state.
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