Push Button LED Circuit using Arduino

This simple Push Button LED Circuit using Arduino shows how to turn an LED ON and OFF using a push button switch.

When we press the button, the LED turns ON, and when you release it, the LED turns OFF; furthermore, this project helps beginners learn about digital input and output in Arduino.

Arduino Coding:

int led = 13;
int button = 2;
int buttonstate = 0;

void setup() {
pinMode(led, OUTPUT);
pinMode(button, INPUT);
}

void loop() {
buttonstate = digitalRead(button);
if (buttonstate == HIGH) {
digitalWrite(led, HIGH);
} else {
digitalWrite(led, LOW);
}
}

Code Explanation:

• Pinmode sets LED as output and button as input.
• Digitalread reads button state.
• The if condition checks whether the button is pressed (HIGH).
• if pressed LED turns ON using digitalwrite high.
• Else, LED turns OFF using digitalwrite low.

Circuit Working:

Parts List:

Components	Values	Quantity
Resistors	220Ω 1/4 watt	1
	10k 1/4 watt	1
Semiconductors	Arduino UNO Board	1
	LED 5mm any color	1
	Push Button Switch	1

When we do not press the button, pin 2 stays LOW and the LED remains OFF; when we press the button, it supplies 5 V to pin 2.

After that, Arduino reads HIGH and LED turns ON and when button released then pin 2 goes LOW again and and LED turns OFF.

Formula:

Below is the formula for Push Button LED Circuit:

Current through LED = V / R = 5V / 220 ohm = 0.022a = 22ma

The circuit uses a 220Ω resistor for the LED, which requires about 20ma of current and additionally, the circuit uses a 10kΩ resistor to keep the input low when no one presses the button.

How to Build:

To build a Push Button LED Circuit using Arduino follow the below steps for connection:

• First, collect all parts same as circuit diagram
• Next, join LED positive leg (anode) to pin 13 using 220 ohm resistor and join LED negative leg (cathode) to ground pin.
• Then connect one side of push button to pin 2 of Arduino and connect other side of push button to 5V pin
• Now put 10k resistor between button pin 2 and ground

Conclusion:

Overall, this project if for Push Button LED Circuit using Arduino, as it shows how to control an led with a push button using Arduino; also circuit is simple and helps to learn digital input and output basics easily