SMART TECH & IoT
Programming Arduino for industrial use
Arduino boards have evolved far beyond their educational and hobbyist origins, increasingly fi nding their place in industrial environments, from automation prototypes to reliable embedded controllers. However, using Arduino in professional contexts requires a different mindset than in DIY projects. This article explores the key do’s, don’ts, and best practices for programming and deploying Arduino-based systems in industrial applications.
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longside its familiar open ecosystem, Arduino has introduced a Pro line that even supports IEC 61131-3 languages for developers coming from PLCs and SCADA systems. But this article takes a different angle: it speaks to the many designers who grew up with sketches, shields and maker-era patterns and now want to bring that knowledge into industrial settings. The transition requires adopting an approach centered on robustness, maintainability and safety.
The subject is vast, and entire books could be written on each subtopic. What follows is a wide yet practical overview, an invitation to think in “industrial terms,” with references to a simple scenario: monitoring an input while simultaneously performing an HTTP exchange. It’s a modest example, but it exposes several fundamental principles.
Writing fi rmware that survives the real world
When you move from hobby projects to industrial deployments, your fi rmware no longer runs for minutes or hours. It runs for years, often unattended. It must react predictably to noise, partial communication failures, unexpected resets and edge cases you may not even imagine while sitting at your desk.
Many Arduino examples treat control logic as a linear sequence: send an HTTP request, wait for a response, parse it and continue. Meanwhile, the input you intended to monitor may toggle unnoticed. The fi rmware works during casual testing yet silently drops critical events when deployed. The issue is not slow networking, it is blocking execution.
that transition only under specifi c conditions. Crucially, you must include the states that hobby sketches often forget: Error, Recover, Cleanup. These are the states that make systems return from failure instead of staying stuck.
On Arduino, FSMs can be implemented with simple switch statements, function tables, or dedicated libraries. What matters is that each state does little work returning control immediately and state transitions must always be intentional and controlled. Over time, this structure allows the fi rmware to grow in complexity without turning into a maze of unpredictable interactions.
Avoid blocking code In industrial fi rmware, waiting (delay()) is almost always unacceptable. Any time the processor stops to wait for something, it is missing something else. Instead of waiting in place, break operations into short actions and schedule them cooperatively. Use timestamps (millis()), timers, or asynchronous APIs where available. If you must perform a long communication step, initiate it and return immediately to the main loop, checking progress incrementally. All tasks must stay reactive at all times. This naturally leads to the next essential concept.
Finite state machines Industrial fi rmware rarely follows a linear narrative. It loops, reacts, retries, recovers. Capturing this explicitly through fi nite state machines greatly increases clarity and reliability. Even a simple task such as “connect � send � wait � read” becomes more robust when expressed through states
24 DECEMBER/JANUARY 2026 | ELECTRONICS FOR ENGINEERS
Managing memory Memory errors are notoriously diffi cult to debug. They often appear only after days or weeks of continuous operation, or only when multiple tasks overlap in unlucky ways. Dynamic allocation (malloc, new) should be limited to well-understood, unavoidable cases. Static buffers with known sizes make behaviour repeatable and auditable. In our example, network buffers, parsing logic and input handling may contend for memory resources. Malformed, oversized, incomplete, or unexpected responses should be handled gracefully. Many bugs come from off-by-one buffer issues, partial messages, or unexpected string lengths.
Watchdog
Some may not know that Arduino boards offer watchdog timer (WDT) functionalities; fewer use them properly. The watchdog is your last line of defence against unresponsive code. A healthy pattern is to enable the watchdog early and refresh it only
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