Project Idea:
This wearable ID card helps maintain safe social distancing by alerting users when others are too close. Using an ultrasonic sensor and Atmega328 microcontroller, the system detects nearby objects and triggers a buzzer with intensity proportional to proximity. It’s ideal for workplaces, schools, and crowds to help ensure health safety post-pandemic.
Project Description:
The system continuously measures distance using an HC-SR04 ultrasonic sensor. When the distance falls below a predefined threshold, the Atmega328 microcontroller activates a buzzer and LED to warn the user. The closer the detected person, the faster the buzzer beeps. The setup is compact, wearable, and battery-powered, suitable for personal use and portable applications.
List of Components:
Atmega328 Microcontroller
HC-SR04 Ultrasonic Sensor
Active Buzzer (3.3–5V)
Rechargeable Li-ion Battery (3.7V – 5V boost)LM7805 Voltage Regulator
5V Boost Converter Module
LEDs
Resistors
Capacitors
Transistors
Switches
PCB Board (6×8 cm)
Connecting Wires
Neck Strap
Features:
Ultrasonic distance sensing (2–400 cm range)
Automatic buzzer alert for close proximity
LED visual indicator for alert level
Portable and lightweight ID card form factor
Rechargeable battery supported
Compact PCB layout
Applications:
Office and corporate staff ID card systems
School/college identity badge for health safety
Public service staff monitoring
Medical and event crowd management
Project Includes:
Fully assembled and tested circuit
Circuit diagram
Source code
(For DIY KITs - only the components will be provided)
Project Types:
- DIY KIT(Do IT YourSelf KIT) - We are providing only components in this kit for this project
- DIY KIT with Code & Circuit Connections - Along with the components, you will get the Code and the Circuit Connections file to help you build the project easily.
- Readymade Breadboard - We are providing fully assembled, tested and ready-made project using plug-n-play jumper wires and breadboard with all the other components, code & circuit diagram.
- Readymade Soldered - We are providing fully assembled, tested and ready-made project soldered on a PCB with all the other components, code & circuit diagram.
Shipping Dimensions (in cm): 10 × 8 × 4 cm
Estimate shipping weight: 1kg
Notes: All the products are made by LearnElectronics India and not for re-sale. If you want to order a product, please reach out to us at +91-7600948607.

