MARINE
Lign Light – LED-Based Oxygen Indicator for Divers.
Project Overview
Developed a compact underwater sensor that visually alerts divers of remaining oxygen levels through distinct LED color patterns. This real-time indicator enhances underwater safety and situational awareness during deep-sea dives.
HARDWARE | FIRMWARE | EMS MANUFACTURING
Client Requirement & Objectives
Lack of Visual Oxygen Feedback
There was no existing mechanism for divers to visually monitor oxygen levels in real time, leading to potential safety hazards during deep-sea expeditions.
Pressure-Based Oxygen Estimation
The device must incorporate a pressure sensor to continuously estimate remaining oxygen and emit corresponding LED signals.
LED-Based Alert System
The LED should blink green for >30% oxygen, orange for 10–30%, and red for <10%, providing a simple yet effective visual cue to the diver.
High Visibility & Ease of Use
The design must ensure the LED is clearly visible from a distance of at least 10–20 meters underwater, assisting not just the diver but also their team.
System Design & Build
Pressure Sensing Logic
Designed a compact circuit using high-accuracy pressure sensors calibrated for standard dive tanks.
LED Control Algorithm
Developed logic to dynamically switch between green, orange, and red blinking patterns based on tank pressure readings.
Waterproof Enclosure
Engineered a sealed, rugged casing that withstands deep-sea pressure and protects electronics from saltwater intrusion.
Visibility Optimization
Incorporated a high-intensity LED driver circuit to ensure brightness and visibility up to 20 meters underwater.
Key Challenges & Solutions
Underwater Visibility
The biggest challenge was ensuring the LED light remained clearly visible in murky, low-light conditions. We used a specialized high-power LED and optical diffuser to enhance beam spread.
Power Efficiency
Balancing LED brightness with battery life was critical; we implemented pulse-width modulation (PWM) to conserve power without compromising visibility.
Sensor Calibration
Pressure sensors were precisely calibrated for diving conditions and tested against simulated tank environments.
Compact Integration
Fitting all components into a small, pressure-proof housing required multilayer PCB design and efficient thermal management.
Project Tech Stack
Nordic
TE Connectivity
Client
Succorfish is a technology company that aims to offer precise, dependable, and cost-effective monitoring technology that can operate in the most extreme and remote locations on earth.
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