Alert Welcome Sensor System

thingiverse

This is a sensor system designed to detect when a person is approaching. This demo video showcases one of its key features. https://drive.google.com/file/d/18dXX_CxkkV_r9b6Lb3qpZcPS9rGw1GqA/view?usp=sharing Four primary functions are integrated into this system: 1. The buzzer remains silent when no one is nearby, while the light displays a green color. 2. When someone gets close enough, the light turns red to indicate an approaching person. 3. As an individual approaches, the light begins to blink in blue, and the buzzer plays "Twinkle Twinkle Little Star." 4. Pressing the switch switches the song between "Song of Joy" and "Twinkle Twinkle Little Star." Several scenarios suggest potential applications for this product: 1. Restaurants could use it to detect when customers are approaching. 2. Individuals with impaired vision can utilize this system to determine if people are approaching. 3. Those with hearing disabilities can also rely on the light to indicate when someone is approaching. The circuit design is straightforward, and a visual representation of the circuit can be easily interpreted by viewing the attached picture. Here's a detailed explanation of the circuit: 1. Connect the power and input pins to the ultrasonic sensor, which sends distance data to the computer. 2. The light is connected to an output pin that controls color changes based on distance detection, with resistors in place to prevent damage. 3. The buzzer is linked to an output pin that transmits varying voltages or tones to play music. 4. The switch is connected to an input pin that informs the laptop whether the switch has been pressed.