How do you plan to solve it?
/*Paste your code here*/
#define LED_PIN 7 // Example: connect LED to digital pin 7
void setup() {
pinMode(LED_PIN, OUTPUT);
}
void loop() {
digitalWrite(LED_PIN, HIGH); // LED ON
delay(400); // Wait 400 ms
digitalWrite(LED_PIN, LOW); // LED OFF
delay(800); // Wait 800 ms
}
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Add a photo of your hardware showing the output.