Circuit Documentation

Summary

This circuit is designed to blink an LED using an Arduino UNO. The LED is connected to a digital pin on the Arduino through a current-limiting resistor. The Arduino is programmed to turn the LED on and off at one-second intervals, with status messages printed to the serial monitor.

Component List

1. Arduino UNO

   • Description: A microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. LED: Two Pin (red)

   • Description: A red LED with two pins: cathode and anode.
   • Pins: cathode, anode

3. Resistor

   • Description: A resistor with a resistance of 220 Ohms.
   • Pins: pin1, pin2
   • Properties:
     • Resistance: 220 Ohms

Wiring Details

Arduino UNO

• GND is connected to the cathode of the LED.
• D2 is connected to pin2 of the resistor.

LED: Two Pin (red)

• cathode is connected to GND of the Arduino UNO.
• anode is connected to pin1 of the resistor.

Resistor

• pin1 is connected to the anode of the LED.
• pin2 is connected to D2 of the Arduino UNO.

Code Documentation

Code for Arduino UNO

void setup() {
  pinMode(2, OUTPUT);
  Serial.begin(9600);
}

void loop() 
{
  digitalWrite(2, HIGH);
  delay(1000);
  Serial.println("Led is in ON state");
  digitalWrite(2, LOW);
  delay(1000);
  Serial.println("Led is in off state");
}

Code Explanation:

• setup(): This function runs once when the Arduino is powered on or reset. It sets pin 2 as an output and initializes the serial communication at a baud rate of 9600.
• loop(): This function runs repeatedly. It turns the LED on by setting pin 2 to HIGH, waits for one second, prints "Led is in ON state" to the serial monitor, turns the LED off by setting pin 2 to LOW, waits for another second, and then prints "Led is in off state" to the serial monitor. This cycle repeats indefinitely.