A Tiny, GSM-Based, Long-Range SPY DEVICE

Bluetooth-based spying devices enable eavesdropping, much like those in James Bond films. However, Bluetooth and Wi-Fi have a limited range, restricting their effectiveness. Now, imagine discreetly intercepting conversa- tions, uncovering criminal intent, and taking timely action—an intriguing possibility.

- ASHWINI KUMAR SINHA

A compact GSM-based surveil-lance device can enable monitoring across vast distances, even between countries. Its small size ensures easy concealment while maintaining an unlimited range.

Strictly intended for security and surveillance, it must not be used for unauthorised purposes. The series of articles beginning with this one covers various long-range spying technologies, starting with GSM-based communication, followed by FM and Wi-Fi-based methods.

A compact board is required to construct this device. The Indus-Board Coin is an ideal choice, measuring only 3cm, with the SIM800L GSM module fitting perfectly within this small form factor. This combination allows the development of an efficient and discreet spying device capable of transmitting audio over long distances.

The required components are listed in the Bill of Materials table.

Software

Before writing the code, the required library must be installed. Follow these steps: 1. Open Arduino IDE

2. Go to Sketch→Include Library →Manage Libraries

3. In the Library Manager, search for Adafruit FONA

4. Click on Install next to the Adafruit FONA Library