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Bertrand Selva

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A low-cost MEMS gyrocompass measures Earth s rotation to determine true north and latitude, independent of magnetic fields.

No More Compass: True North via Earth s Rotation

480

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9
Measure Earth’s rotation using two MEMS gyros, a Pi Pico, and smart signal processing—precision within 2% of the true value!

Measuring Earth’s Rotation with MEMS Gyros

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7
Encrypted off-grid LoRa messaging terminal with GPS sync and dynamic key destruction. No network, no trace, full control.

Pi PICO LoRa text messenger

701

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11
A low-power embedded system to forecast temperature two hours ahead

What if we could predict the future?

421

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7
Low-cost PMR446 collinear with high gain, accurate impedance match, and a fully 3D-printed structure for reproducible builds.

3×5:8λ PMR antenna :Clean, Matched, 3D Printable

418

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7
Invisible indoor pollutants? This ESP32 IoT node (AP mode) reveals them—TVOC, eCO₂, temperature, humidity rate —via its own Wi-Fi dashboard.

Compact and Low-Cost ESP32 IoT Air Quality Monitor

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7
DIY off-grid terminal using Arduino Mega, TCM3105 modem, GPS, and error correction for resilient text communication.

Fallout-Style Communication Terminal: AFSK Modem

466

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8
This project presents a compact system capable of determining the direction and elevation of a sound source in real-time with Pi PICO

Acoustic Targeting Module for Tactical Drone

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How to spy on your neighbor (scientifically)? Acoustic parabola + NLMS on ESP32.

Acoustic Parabola with NLMS Adaptive Filtering on

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