Eslog System Case Study
Eslog is a smart data logger that tracks temperature and humidity during product transportation and storage. Data is accessed using NFC technology via a mobile application available on iOS and Android, allowing users to retrieve detailed temperature and humidity logs quickly and effortlessly. By enabling accurate data collection and easy access to historical records, Eslog helps maintain product integrity, prevents spoilage or damage.
I. Context and Client Profile
While Tracely had a strong product vision and market understanding, the company lacked the in-house engineering resources needed to design and develop a production-ready hardware and software solution. They were looking for a technology partner who could transform their concept into a reliable, scalable product and support them through prototyping, testing, and industrialization.
Business Problem and Need
Traditional data loggers used in transportation are typically single-use devices resembling USB flash drives. After delivery, they must be manually connected to a computer to access stored data, which means there is no real-time visibility during transport and no way to react immediately when conditions exceed acceptable thresholds.
This leads to delayed problem detection, higher risk of product loss, manual reporting processes, and unnecessary electronic waste, as many devices are discarded after one use. Additionally, end customers have limited ability to independently verify whether products were transported under proper conditions, reducing transparency and trust across the supply chain.
Technological and Design Challenges
- Designing a compact enclosure capable of housing all electronic components while maintaining durability, signal integrity, battery performance, and sensor accuracy.
- Achieving long battery life while supporting continuous data logging and wireless communication.
- Ensuring reliable connectivity and data transmission in varying logistics environments such as warehouses, trucks, and cold storage.
- Maintaining high measurement accuracy and stability across wide temperature and humidity ranges.
- Developing a reusable device resistant to mechanical stress, moisture, and repeated handling.
- Balancing cost optimization with industrial-grade quality and regulatory compliance.
- Integrating hardware, firmware, mobile app, and cloud platform into one seamless, scalable ecosystem.
II. Scope of Work
The testing device project was developed entirely by the interdisciplinary team at EmbeddedSystems.do, responsible for the full product development cycle — from electronics design and embedded software development to functional, electrical, and EMC pre-compliance testing.
Hardware – Electronics Design
- Designing a miniature IoT device for temperature and humidity monitoring
- Ensuring cost-effectiveness and manufacturing in the EU
- Achieving up to 5-year battery life
- Supporting multiple device variants: temperature, temperature PRO, temperature + humidity
- Integrating NFC connectivity for fast, contactless data reading
- Electrical optimization for energy efficiency
- Maintaining high measurement accuracy
- Designing durable, food-safe housing
Software
- Creating a cross-platform mobile application (Android and iOS)
- Displaying real-time data from Eslog devices
- Building a cloud-based dashboard for historical data and fleet management
- Providing visual analytics for quick insights
- Integrating geolocation tagging
- Automating data synchronization with the cloud
Firmware
- Developing stable, energy-efficient firmware
- Enabling reliable NFC communication
- Ensuring seamless interaction with mobile apps while preserving battery life
Certification Preparation
- Supporting Tracely through EU certification and regulatory compliance
- Coordinating with Hamilton Laboratory for testing and validation
Technologies and Tools
- KiCad for PCB design
- NXP microcontrollers with NFC support
- SolidWorks for enclosure design and prototyping via certified 3D printing workshops
- React Native for cross-platform mobile application development
- AWS Amplify for cloud infrastructure and data storage
- Lowable AI system for data intelligence and analytics optimization
III. Project Team
The Eslog Systems project was carried out by an interdisciplinary team of experts at EmbeddedSystems.do. Their experience and close collaboration enabled the timely delivery of a solution that met stringent technical requirements as well as HACCP and EU regulatory standards.
IV. Process and Methodology
The Eslog System project was executed using an Agile approach with short weekly sprints, enabling a high work pace and real-time responsiveness to the client’s needs. Regular status meetings with the client facilitated quick decision-making, transparent communication, and efficient risk management.
1. Discovery and Requirements Analysis
The project began with a detailed analysis of client goals, industry needs, and regulatory requirements. Technical specifications and product variants were defined to ensure compliance and feasibility.
2. Design and Architecture
Hardware, firmware, and system architecture were planned to integrate all components efficiently. The design supported multiple Eslog versions while maintaining accuracy, durability, and cost-effectiveness.
3. Prototyping
Eight iterations of the Eslog device were developed and tested. The final mini version was successfully produced in a batch of 1,500 units, incorporating lessons learned from previous prototypes.
4.Development and Implementation
Hardware and firmware were finalized to ensure reliability, energy efficiency, and regulatory compliance. All components were optimized for performance and long-term usability.
5. Mobile Application
A cross-platform app for Android and iOS was developed, enabling real-time monitoring, scanning, and an intuitive user experience for Eslog devices.
6. Dashboard
The cloud-based dashboard provided fleet management, historical analytics, geolocation, and automated data synchronization, allowing clients to track and analyze data efficiently.
7. Functional and Electrical Testing
Measurement accuracy tests were conducted in collaboration with Biovico R&D, and comprehensive functional tests were performed. All results met the required standards.
8. Production Preparation and Documentation Support
Production-ready designs and manufacturing documentation were prepared, and certification processes for EU compliance were fully supported to ensure smooth market launch.
V. R&D
Eslog IR
One of our R&D solutions is ESLOG IR, a miniature infrared camera that transforms smartphone into a powerful, touchless thermal scanner. Thanks to its compact, pocket-sized design, ESLOG IR allows temperature measurements anytime and anywhere.
The device attaches directly to a phone case, and through the accompanying app, users can view detailed temperature maps, making it a convenient and versatile solution for fast, accurate thermal monitoring.
Eslog Solar-Powered
ESLOG Solar-Powered, a device designed to operate efficiently using solar energy. By harnessing sunlight, this solution can function autonomously for extended periods, reducing the need for frequent battery replacements or external charging. Its sustainable, energy-efficient design makes it ideal for monitoring conditions in outdoor or remote environments, ensuring reliable performance while minimizing environmental impact.
Eslog Body Sense
Another R&D solution we designed is eslog Body Sense. It is a wearable, non-invasive medical monitoring system designed to continuously track a patient’s body temperature and related physiological signals without requiring manual measurements. It replaces traditional spot-check methods with real-time data collection, making patient monitoring more accurate, efficient, and comfortable.
VI. Outcomes
- Launched a data logger that is up to 5× more cost-effective than traditional USB-based devices
- Enabled computer-free operation via NFC and mobile apps, meeting the needs of mobile-first and developing markets in Africa and Asia
- Replaced static PDF-based reporting with real-time fleet visibility across multiple locations
- Supported Tracely in securing funding from the Polish Agency for Enterprise Development (PARP)
- Product incubated at Unicorn Hub
- Nominated for the World Summit Awards (WSA)
- Developed 8 hardware versions, with the final mini version manufactured in a batch of 1,500 units
- Conducted measurement accuracy testing with Biovico, with all functional tests compliant
- Enabled measurement intervals from 10 seconds to 1 hour
- Provided data history up to 2.5 months (at hourly measurement intervals)
- Added a visual LED indicator to signal temperature breaches during transport
- Developed a solar-powered R&D version for energy-constrained environments
Feedback from Hydropolis after testing eslog solutions
“The system offers intuitive and seamless access to data. Monitoring is simplified — data becomes available instantly by bringing a smartphone close to the sensor. Users benefit from easy, continuous access to recorded measurements, with data that is both readily available and editable.” — Anna Drwięga COO & Co – founder