Arduino button press12/15/2023 ![]() ![]() ![]() Connect a jumper wire from the 5-volt pin to one side of the pushbutton.Most buttons will straddle the center trench on the breadboard. Place the pushbutton on the breadboard.Connect the 220-ohm resistor from pin 13 to the same row that you have the long leg of the LED attached.Connect the short leg of the LED to this same ground rail on the breadboard then connect the long leg to a row on the breadboard.Connect one of the Arduino GND pins to one of the long power rails on the breadboard – this will be the ground rail.By submitting this form you agree to the privacy policy, and can opt-out anytime. You will receive email correspondence about Arduino programming, electronics, and special offers. Check the section on Further Reading section for a video which demonstrates why the resistor keeping pin 2 at ground is essential. Floating pins on the Arduino are fine for the most part – unless you are trying to record an input from them – then they are bad, and can give you spurious information. If pin 2 is not connected to ground, then when the button is not being pressed it becomes what is called a floating pin – it’s not connected to anything. This is because when we read values at pin 2, we want to get either a HIGH or a LOW reported. ![]() We also have pin 2 connected to ground at all times through a resistor. To turn on an LED by pressing the button, we simply make an if statement whose condition says something like “…if the voltage at pin 2 is HIGH, turn on the LED at pin 13…” It is really that easy. During the times the button is not being pressed, pin 2 reports LOW. When you press the button it completes an electrical connection, pin 2 will “see” the 5 volts and if we digitalRead() at pin 2, it will report HIGH. In this example we simply hook up 5 volts to one side of a button and to the other side of the button we connect pin 2. Using a button is as easy as you might think, but at the same time can be a source of frustration. Knowing how to employ them in your projects is very beneficial. They are everywhere and there is a certain pleasure in pressing them. Get 10 tips every new Arduino coder should know ➜ Arduino Course for Absolute Beginners Using a Button with ArduinoĪnything cool has buttons. ![]()
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