Step-by-Step Instructions
1. Connect the PIR motion sensor to the Arduino: VCC to 5V, GND to GND, OUT to digital pin 2.
2. Connect three LEDs (or one RGB LED) to digital pins 9 (red), 10 (green), and 11 (blue) through 220-ohm resistors to ground.
3. Upload Arduino code that reads the PIR sensor output and lights up the LEDs when motion is detected.
4. Test the circuit by moving in front of the sensor to ensure LEDs light up.
5. Mount the components on the cardboard or wooden board, arranging the LEDs to spell 'WELCOME' or simply cluster them as a colorful light display.
6. Secure all components with double-sided tape or glue.
7. Power the Arduino via USB or a 9V battery pack for portability.
8. Place your smart welcome sign near the entrance to greet guests with light when they arrive.