LED Blink

September 20, 2025

Solving Approach

How do you plan to solve it?

Building an LED blinking task with a microcontroller involves two main parts: a hardware circuit and software code. The hardware part requires connecting an LED to a microcontroller pin via a current-limiting resistor. To ensure a current of 10 mA flows through the LED, you'll need to calculate the appropriate resistor value using Ohm's Law. The calculation would be R=(V_source−V_f)/I, where V_source is the microcontroller's voltage (e.g., 5V), V_f is the forward voltage drop of the LED (typically 2V for a standard red LED), and I is the desired current (10 mA). Once the resistor is in place, the software part involves writing code to control the state of the digital pin connected to the LED. The program would use a loop that repeatedly sets the pin to HIGH to turn the LED on, waits for 400 milliseconds, then sets the pin to LOW to turn it off, and waits for another 800 milliseconds. This cycle repeats continuously, creating the blinking effect.

Code

/*Paste your code here*/

const int ledPin = 13; 
void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  digitalWrite(ledPin, HIGH);
  delay(500);

  digitalWrite(ledPin, LOW);
  delay(1000);
}

Output

Video

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Photo of Output

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