Cold-Chain Monitoring Device
Overview
The Challenge
A pharmaceutical logistics company aimed to solve a critical problem: maintaining the integrity of temperature-sensitive vaccines during transport. External environmental fluctuations and poor visibility often lead to spoilage and reduced efficacy. We engineered an embedded solution using an ESP32 microcontroller that monitors and maintains optimal container conditions. The system tracks temperature, humidity, and CO₂ levels in real-time, using a CO₂-powered active cooling mechanism regulated by a PID control loop. Remote connectivity through MQTT, local BLE-based control, and an E-Ink display provided both cloud and local visibility into device performance. The compact, battery-powered unit was housed in a rugged enclosure, making it suitable for harsh transit environments. The result was a reliable, portable cold-chain device that dramatically reduces vaccine spoilage and improves compliance with medical safety standards.
Our Approach
How We Did It
Designed
Developed hardware architecture, custom PCB, and sensor interface.
Programmed
Implemented firmware with control logic, MQTT, BLE, and UI features.
Integrated
Tested full system with hardware, power management, and mobile app pairing.
Impact
The Results
The device ensured the safe delivery of critical vaccines in diverse climates. With live telemetry, remote diagnostics, and automated temperature control, it empowered logistics teams to act proactively, reducing spoilage and improving trust in cold-chain reliability.
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