Automatic Day-Night LED Strip Controller Using Arduino

1// Beginner-friendly: Read button on pin 6 and control a relay on pin 2 
2// Wiring (recommended): 
3//  - Relay module VCC -> 5V 
4//  - Relay module GND -> GND 
5//  - Relay module IN  -> Arduino digital pin 2 
6//  - Button one side -> Arduino pin 6 
7//  - Button other side -> GND 
8// Note: This sketch uses INPUT_PULLUP, so button connects to GND when pressed. 
9const int RELAY_PIN = 2;    // Relay control pin 
10const int BUTTON_PIN = 7;   // Input pin (button or switch) 
11// If your relay module is "active LOW" (common for many modules), set true. 
12// If your relay turns ON when IN is HIGH, set false. 
13const bool RELAY_ACTIVE_LOW = false; 
14void setup() { 
15Serial.begin(9600);                 // Optional: debug output to Serial Monitor 
16pinMode(RELAY_PIN, OUTPUT);         // Relay pin is an output 
17pinMode(BUTTON_PIN, INPUT_PULLUP);  // Use the internal pull-up resistor 
18// Make sure relay starts OFF 
19if (RELAY_ACTIVE_LOW) digitalWrite(RELAY_PIN, HIGH); // HIGH -> off for active-low relay 
20else digitalWrite(RELAY_PIN, LOW);                   // LOW  -> off for active-high relay 
21Serial.println("Ready. Press the button to turn the relay ON."); 
22} 
23//Made By Rohan Barnwal 
24void loop() { 
25// Read the button. Because of INPUT_PULLUP, pressed == LOW. 
26int raw = digitalRead(BUTTON_PIN); 
27bool pressed = (raw == LOW); // true when button is pressed 
28// Simple debounce: when we detect a press state change, wait briefly and re-read. 
29static bool lastPressed = false; 
30if (pressed != lastPressed) { 
31delay(30);                     // small debounce delay (30 ms) 
32raw = digitalRead(BUTTON_PIN); 
33pressed = (raw == LOW); 
34lastPressed = pressed; 
35} 
36// Turn relay on or off based on button 
37if (pressed) { 
38// Turn relay ON 
39if (RELAY_ACTIVE_LOW) digitalWrite(RELAY_PIN, LOW);  // active-low -> LOW turns ON 
40else digitalWrite(RELAY_PIN, HIGH);                  // active-high -> HIGH turns ON 
41Serial.println("Relay: ON"); 
42} else { 
43// Turn relay OFF 
44if (RELAY_ACTIVE_LOW) digitalWrite(RELAY_PIN, HIGH); // active-low -> HIGH turns OFF 
45else digitalWrite(RELAY_PIN, LOW);                   // active-high -> LOW turns OFF 
46Serial.println("Relay: OFF"); 
47} 
48delay(100); // small loop delay to avoid flooding Serial 
49}