Pocket Beacon

LoRa can reach many kilometers in open terrain with a clear line of sight, and the Meshtastic protocol automatically relays messages hop-by-hop through any other nodes in range — so your effective range scales with the number of devices in the field. The radio module is swappable, allowing you to target different frequency bands to meet regional regulations (915 MHz in North America, 868 MHz in Europe, etc.) or optimize for specific range and penetration characteristics. A second radio can be added for dual-band operation or to run parallel private and shared mesh channels simultaneously.

OLED panels maintain contrast and readability in direct sunlight where LCD panels wash out, and they draw near-zero power when displaying dark content. In base station mode, the Orange Pi Zero 2 W's micro-HDMI output lets you connect a full-size monitor — turning the device into a desktop-class dashboard showing live mesh traffic, node positions on a map, sensor feeds, or AI inference output. For embedded installations, a secondary display can also be driven over I2C or SPI directly from the ESP32.

Different vibration patterns can be programmed per event type — a short pulse for an incoming message, a long pulse for a low battery warning, a rapid sequence for a Sentry Node perimeter breach. This means you can identify alert severity by feel alone without breaking focus. In noisy field environments like machinery, gunfire, or crowded events, haptic feedback is often the only reliable notification channel.

The IMU enables a range of behaviors beyond display orientation. Sudden acceleration events can trigger tamper alerts if the device is moved or dropped unexpectedly — useful for unattended fixed installations. Tilt and shake gestures can be mapped to UI shortcuts, letting you navigate menus or dismiss alerts without pressing a button. When fed into the AI layer, IMU data can be used for dead reckoning — estimating position using motion patterns when GPS signal is unavailable. Motion logs can also be recorded and reviewed after an operation to reconstruct movement timelines.

Multi-constellation support (GPS, GLONASS, and Galileo where available) improves fix accuracy and reduces the time to first lock, particularly in partially obstructed environments like tree cover or canyon terrain. Continuous GPS tracks can be logged locally for route playback and after-action review. Position data can also be used by the mesh routing layer to intelligently forward messages through the nearest or most efficient relay node, reducing hop count and improving delivery reliability across large deployments.

Battery state-of-charge is broadcast as part of each node's mesh status packet, so you can see the power level of every deployed unit from a single device without physically checking each one. Board temperature monitoring protects the system under sustained AI workloads or when enclosed in a hot vehicle or enclosure — thermal warnings can trigger automatic power reduction or shutdown before damage occurs. For truly indefinite off-grid deployment, the system can be paired with a solar charge controller and panel, making fixed installations self-sustaining across days or weeks.

A local text-to-speech model running on the Orange Pi can read incoming mesh messages aloud as they arrive — no interaction required. This makes the device genuinely hands-free for operators who are driving, working livestock, or managing tools. The speaker also supports push-to-talk voice relay: record a voice message, compress it, and transmit it as a packet across the mesh to any other node, functioning like a long-range radio that works without any infrastructure. Audio tones and spoken alerts can be fully customized per event type.

Running OpenAI's Whisper model locally on the Orange Pi provides accurate offline speech-to-text transcription — fast enough on the 4 GB platform for practical real-time use. This enables spoken message composition, voice-activated queries to the AI assistant, and audio logging for later transcription. A wake-word detection system can keep the microphone listening passively for a trigger phrase, activating the full pipeline only when needed to preserve battery and processing headroom. The microphone can also be used for ambient audio capture, environmental monitoring, or PTT voice relay over the mesh.

Button functions are fully remappable in firmware — any button can be assigned to any action, from scrolling through contacts to triggering a preset message, activating PTT voice relay, or cycling through display modes. Deployment profiles can define different button layouts for different use cases: one profile for field comms, another for a fixed monitoring station. This gives operators tactile control over the device's most-used functions without ever unlocking a screen or navigating a menu.

Each LED can be individually addressed, allowing distinct colors and animation patterns per event — a slow pulse for mesh connected, a solid red for a Sentry Node alert, a fast blink for an incoming message. In low-light environments, LEDs provide situational awareness without illuminating a screen that could compromise night vision or reveal position. When the device is mounted on a vehicle, pack, or post, the LEDs serve as the primary status indicator visible from a distance. They can also be used as a visible beacon for team coordination — color-coded by operator role or alert priority — across a distributed group operating in the dark.