Arduino Computer Vision: What It Can Do (and Where It Breaks)

The "It Works on My Desk" Trap #

It's the classic story: an enthusiastic engineer buys an Arduino Portenta or an ESP32-CAM for very little money, hooks up a camera, loads a TensorFlow Lite model and manages to detect an apple on their desk. Success!

The manager approves the project. It gets installed on the production line. And then...

• The camera reboots every time the conveyor motor starts (electrical noise).
• Images come out blurry because the part is moving (rolling shutter).
• The system fails after 2 months because of dust and heat.

Welcome to the reality of industrial machine vision. Here we compare why hobby hardware doesn't survive on the plant floor.

Hardware Comparison: Hobby vs Industrial #

The 3 Critical Failure Points #

1. The Shutter Problem

Most cheap camera modules use a rolling shutter: they scan the image line by line. If your product is moving on the conveyor, the image comes out skewed or warped (the "jello effect").

Industrial fix: cameras with a global shutter. They capture the whole frame in a single instant and freeze motion cleanly. It's a must for fast conveyors.

2. Integrating with the PLC (24V vs 5V)

Arduino runs at 5V or 3.3V. Industrial PLCs run at 24V. Wiring an Arduino straight into a PLC will fry the Arduino.

You need optocouplers, power supplies, DIN rails, tidy wiring... In the end you've built a "black box" full of loose wires that is a nightmare to maintain.

3. Electrical Noise (EMI)

A factory is full of large motor drives (VFDs) that generate electromagnetic noise. An unshielded Raspberry Pi will reboot at random or throw false positives from interference on the signal cables.

Cost Analysis: Buy Cheap, Pay Twice #

Say the industrial PC costs several times what the Arduino setup does.

• Line stoppage: if the Arduino fails and stops the line for 1 hour, how much does the plant lose? (Often thousands of dollars.)
• Maintenance: if the person who built the Arduino rig leaves the company, who knows how to fix that tangle of wires?

The ROI of industrial equipment is justified by avoiding a SINGLE line stoppage.

The Alternative: The Hybrid Path #

You don't need to spend on an expensive proprietary Cognex camera to get reliability. The modern approach is:

1. Open industrial hardware: a rugged fanless industrial PC (x86).
2. USB3/GigE industrial camera: from an established machine vision camera maker, with a global shutter.
3. Professional open-source software: your Python/C++ code running in Docker on Linux.

This gives you the ruggedness of PLC-grade hardware with the flexibility of modern software. It's exactly what iGromi OS offers.