LED Blink

AvellanaAlliyahKasandraA

September 20, 2025

Solving Approach

1. Circuit Setup:

Connect an LED in series with a resistor to a microcontroller GPIO pin.

The resistor value is chosen so that only ~10 mA flows through the LED.

Assuming a 5 V GPIO, LED forward voltage of ~2 V, and desired current of 10 mA:

R = \frac{5V - 2V}{0.01A} = 300 \, \Omega

2. Code Logic:

Configure the LED pin as output.

Turn LED ON for 400 ms.

Turn LED OFF for 800 ms.

Repeat continuously in a loop.

3. Expected Behavior:

The LED blinks with ON-time shorter than OFF-time.

This creates a visible blink pattern (400 ms ON, 800 ms OFF).

Code

/*Paste your code here*/
// LED Blink Task
// LED connected to pin 13 (or any GPIO)
int ledPin = 13;  // GPIO pin for LED
void setup() {
  pinMode(ledPin, OUTPUT); // set LED pin as output
  }
  void loop() {
    digitalWrite(ledPin, HIGH); // turn LED ON
      delay(400);                 // wait 400 ms
        
          digitalWrite(ledPin, LOW);  // turn LED OFF
            delay(800);                 // wait 800 ms
            }

Output

The LED turns ON for 400 ms, OFF for 800 ms, continuously.

Video

Photo of Outputs

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