The project I have chosen is a device that captures the dominant colors displayed on a PC screen and reproduces them on an LED strip mounted behind it.

Its purpose is to provide a pleasant experience for users who spend a lot of time in front of the computer, especially gamers.

The idea comes from TVs that have this LED system on the back to provide a unique experience while watching movies.

The utility of the project consists in enhancing the user's visual experience, creating a more captivating atmosphere, and reducing eye strain in low-light conditions.

Used Arduino UNO and an external library (FastLED) for controlling WS2812B LED strip.

• Abstracts the timing-sensitive signal required by addressable LEDs.

The project features multiple operating modes that can be switched by pressing a button. The mode switching is handled via an external interrupt, allowing fast and responsive detection of the button press event.

ISR(INT0_vect) {
   if ((long)(micros() - lastDebounceTime) >= debounceDelay) {
       mode = (mode + 1) % 3;
       lastDebounceTime = micros();
       updateNeeded = true;
   }
}

• Mode 0 & 1 – All LEDs are set to a specific color (Red and Green)
• Mode 2 - Automatic fade effect cycling through Magenta, Cyan, and Blue. Used Timer1 to generate a tick every 1 ms:

ISR(TIMER1_COMPA_vect) {
   if (mode == 2) {  // just in mode 2
       millis_counter++;
          if (millis_counter >= 30) { // every 30 ms
              millis_counter = 0;
              fadeBrightness += fadeDirection * 5;  // change intensity
                 if (fadeBrightness >= 255) {
                     fadeBrightness = 255;
                     fadeDirection = -1;  // starts to decrease
                 } else if (fadeBrightness <= 0) {
                     fadeBrightness = 0;
                     fadeDirection = 1;   // starts to increase
                     fadeColorIndex = (fadeColorIndex + 1) % 3;  // change color after a complete cycle
                 }
                 updateNeeded = true;
          }
   }
}

• Mode 3 - Real-time color updates via serial connection using the Adalight protocol (Prismatik)

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