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Depends on your product and industry. At low volumes you can get an app running on a Pi quickly. And it already has wifi and bluetooth. Plus lots of available expansion boards. Power is usually not a concern for industrial equipment.

The Pi Zero and Pi Zero W were used in a ton of IoT devices.

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Unless you’re comparing it to an arduino, many other boards like ESPs have WiFi or WiFi and BT as well, and aren’t hard to get it running quickly. The zero has no wireless as far as I remember.

What were the zero and pi zero w used in?

I've seen a few product for industrial monitoring use the Pi Zero W.

That’s pretty different from ‘a ton’ and I doubt the zero is used meaningfully in iot. I’m trying to think of a scenario where the pi is better than an embedded system, it seems like overkill or overtly complicated to need Linux to monitor this stuff unless it’s also computing it before sending the data, maybe in thinking about it wrong? IoT and edge computing are what I generally think of, and something like Pi I see as a hub.

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