Arduino is an open-source electronics platform based on easy-to-use hardware and software. It consists of a family of microcontroller boards (such as Arduino Uno, Mega, Nano, etc.) and a software development environment (Arduino IDE) that allows users to write code in a simplified version of C/C++. The main goal of Arduino is to make electronics more accessible to artists, hobbyists, students, and anyone interested in creating interactive projects.
my arduino project-1
 {
DDRD = 4;
DDRB = 32;
while(true){
PORTB = 0;
PORTD = 4;
delay(100);
PORTD = 0;
PORTB = 32;
delay(100);
}
}
void loop() {
// put your main code here, to run repeatedly:
}