Visitor Counter Using RGB APDS-9960

The Visitor Counter Using RGB APDS-9960 functions by combining optical sensing, microcontroller logic, and audio-visual signaling to track room occupancy. At the heart of the system is the APDS-9960 sensor, which utilizes an integrated infrared LED and photodiodes to detect ambient light, color, and proximity gestures through reflected light. When a person passes by or waves near the sensor, the device measures the change in light reflection and translates this interaction into an event trigger. The Arduino board, connected via a designated communication interface, continuously polls the sensor to monitor these movement events. An internal software counter running on the Arduino increments with every verified entry detection. The system compares the current visitor count against a predefined threshold limit stored in the microcontroller's memory. As long as the count remains below this limit, the system operates normally, keeping track of traffic. However, the moment the visitor count exceeds the established threshold, the Arduino executes a conditional statement that outputs a control signal to a buzzer. This audible alarm alerts supervisors or operators that maximum capacity has been reached. Powering the entire system requires a stable 5V power supply connected to the Arduino board, which in turn distributes operational voltage to the sensor and buzzer through secure connecting wires. By programming the Arduino IDE using the SparkFun APDS9960 library, developers can fine-tune the detection sensitivity and customize the occupancy threshold to suit specific environment requirements.