How We Enabled Cattle Tracking Using NB-IoT With Solar Cells – Hint: Low Data Rates
Project Overview IoT Tracker is a livestock tracking solution designed specifically for cattle monitoring in remote agricultural environments. The device combines cellular connectivity, solar charging capabilities, and intelligent power management to deliver reliable tracking performance over extended periods. Technical Architecture Core Module Cellular Module: Telit-based communication module with integrated controller Connectivity: Dual CAT-M1 and […]
RED Cybersecurity Compliance for STM32-Based IoT Device with WiFi Module for a German Manufacturer
In 2025, a German IoT company building low-power connected devices engaged Oxeltech to bring their product into compliance with the EU Radio Equipment Directive (RED) Delegated Act 2022/30, which mandates cybersecurity for internet-connected radio devices from 1 August 2025. The Product MCU: STM32F4 series Connectivity: External WiFi module via UART/SPI Functions: Periodic sensor data upload to the […]
Hunting a Memory Leak that Crashed Remote Devices
Credit: www.blues.com Introduction Imagine a fleet of embedded devices deployed across the country, running smoothly for weeks—until, without warning, they stop communicating. That was the mystery we faced when a customer reported a baffling issue in their widely deployed product. After extended uptime, devices would suddenly and silently stop communicating with the central server. The […]
High-Precision Multi-Sensor Temperature Monitoring System for Pharmaceutical Testing with MQTT-Over-Ethernet Connectivity
Introduction: This PCB module version 2.0 was designed as an upgrade for a dissolution tester to measure temperature using sixteen (16) individual PT100 temperature sensors. The previous version supported eight (8) sensors and lacked central network ethernet connectivity. The update was aimed to enhance sensor capacity, add network connectivity via ethernet (IEEE 802.3 standard), support […]
Development of Wearable Headset for Fatigue and Drug Detection
Project Overview This case study presents the development of an advanced Pupilknowlogy system designed to measure Pupillary Unrest Index (PUI) and Pupillary Light Reflex (PLR) for the detection of fatigue and drug influence in subjects. The project integrated hardware and software components to create a comprehensive, portable solution for use in clinical, research, and law […]