This code turns an LED ON and OFF based on the state of a push button connected to digital pin 2. It also shows the state of Push Button on serial monitor.
Now, let's go through the code line by line to understand what each line does:
int ledPin = 13; // LED connected to digital pin 13
int buttonPin = 2; // pushbutton connected to digital pin 2
int buttonState = 0; // variable to store button state
The code begins by defining two integer constants buttonPin and ledPin, which represent the digital pins to which the pushbutton and LED are respectively connected.
Then, an integer variable buttonState is defined and initialized to 0. This variable will be used to store the current state of the pushbutton.
void setup()
{
pinMode(ledPin, OUTPUT); // initialize LED pin as an output
pinMode(buttonPin, INPUT); // initialize pushbutton pin as an input
Serial.begin(9600); // initialize serial communication
}
In the setup() function, the pinMode() function is used to set the LED pin as an output and the pushbutton pin as an input.
The Serial.begin() function is also called to initialize the serial communication at a baud rate of 9600.
void loop()
{
buttonState = digitalRead(buttonPin); // read the state of the pushbutton
if (buttonState == HIGH) // if the pushbutton is pressed
{
digitalWrite(ledPin, HIGH); // turn ON the LED
Serial.println("Button pressed"); // print message to serial monitor
delay (500);
digitalWrite(ledPin, LOW);
}
else // if the pushbutton is not pressed
{
digitalWrite(ledPin, LOW); // turn OFF the LED
}
}
In the loop() function, the digitalRead() function is used to read the state of the pushbutton and store it in the buttonState variable.
If statement checks if the buttonState is HIGH or LOW.
If the pushbutton is pressed, the buttonState is HIGH. The digitalWrite() function is used to turn the LED on, and a message "Button pressed" is printed to the serial monitor using the Serial.println() function.
If the pushbutton is not pressed, the buttonState is LOW. The LED is turned off using digitalWrite().
This code will turn ON or OFF LED with the push button and print a message to the serial monitor every time when the push button is pressed.
