Introduction:
During disasters such as earthquakes, floods, or landslides, traditional communication systems like mobile networks and the internet often fail due to infrastructure damage or power loss. In such critical moments, the ability to communicate can save lives.
To solve this, our team developed a Decentralized Wireless Communication System using LoRa (Long Range) technology and an ESP32 microcontroller. The system enables long-range, low-power, and infrastructure-free communication, ensuring connectivity even when all conventional networks are down.
Project Overview:
We built two transceiver devices that can both send and receive data over long distances using LoRa. Each device is equipped with four buttons and a gyroscopic sensor, designed to make emergency communication fast and effortless.
The four buttons are pre-programmed with short, essential messages such as:
“Are you safe?”
“I am safe.”
“Located.”
“Medical emergency.”
These preset messages were added because, during an emergency, victims may not be able to type messages manually. A single button press can instantly send a message to another node device within range.
The gyroscopic module plays a crucial safety role — if the device is dropped or experiences a sudden fall (for example, due to a landslide or building collapse), it automatically detects the motion and sends an alert message to the other connected device. This ensures that rescue teams or nearby responders are immediately notified, even if the person holding the device cannot act manually.
Technologies Used:
ESP32 Microcontroller: Controls processing and communication.
LoRa Module (SX1278): Provides long-range, low-power wireless data transmission.
Buck Converter: Steps down power from 7.4V to 3.3V for safe component operation.
Display Module: Shows status, messages, and connectivity information.
Buttons: Four pre-coded message triggers for quick emergency communication.
Gyroscope Sensor: Detects falls or device movement and sends automatic alerts.
Battery + Solar Panel: Provides continuous, renewable power supply during outages.
Prototype:
Result:
Impact and Applications:
This system ensures uninterrupted communication during natural disasters, remote expeditions, or emergency rescue missions. It can also be used for IoT-based alert systems, military operations, and environmental monitoring.
Project by:
Abisaka Anandh R G | Afrith Ahamed A J | Visweswaran V | Prasad M | Rishikesh P
Guided by: Dr. M. Ramya, M.E., Ph.D.
Department of Electronics and Communication Engineering
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