Why I Choose JLC for Industrial-Grade Air Quality Monitors

The most important factors for any industrial air quality monitor are its accuracy and reproducibility. So I typically use JLCPCB since they combine PCB fabrication, SMT assembly and parts sourcing into one workflow to avoid handling errors and to maintain consistent builds across different batches.

For sensor-based designs, assembly quality has to be stable. Proper soldering, precise placement, and controlled process variables all contribute to retaining calibration and consistent performance over time. The availability of a large selection of components also makes it easier to source sensors, MCUs, and power components.

When combined with fast delivery times, this results in efficient iterations of products so they can be tested, adjusted and put into production.

Layout view of my PCB

Engineering a Robust Ecosystem

The heart of this system is the ESP32-WROOM-32U, providing the computational power and connectivity needed for real-time edge processing. By choosing JLCPCB, the transition from this complex, multi-layer design to a physical board was flawless, ensuring signal integrity for the high-sensitivity sensors integrated into the array.

Multi-Sensor Integration

To provide a comprehensive overview of environmental health, the board features a curated selection of industrial-grade sensors:

• MQ136 Gas Sensor: Specifically chosen for targeted gas detection (such as Hydrogen Sulfide), broadening the monitor's utility in specialized industrial zones.
• CCS811: For monitoring Total Volatile Organic Compounds (TVOCs) and equivalent CO2 levels.
• DFRobot SHT31-D: A high-precision digital temperature and humidity sensor protected by a PTFE membrane for long-term stability.

Power Management for the Field

Reliability in the field depends on power stability. The design incorporates a sophisticated power path:

• TP4056 Charging Module: Manages the 3.7V Li-ion battery lifecycle via USB.
• LM2596 Buck Converter: Ensures an efficient step-down to 3.3V/5V rails, maintaining steady operation even as battery levels fluctuate.