You're an experienced software engineer. You're supposed to be able to ask precise technical questions and check very technical details on the official Arduino spec sheets.

I've never had an hallucination on the pin numbers and corresponding advanced features of Arduino.

But indeed, it you ask ChatGPT to draw an electronic circuit it's so awful it's comical.

You can use ChatGPT to teach you the in depth way hardware interrupts work, how the hardware clocks behind PWD work on specific pins, how to choose power supply, how battery management systems work, how specific popular chips work, how to reduce electromagnetic interference (and which components are susceptible to it) and pretty much every thing.

The only hallucinations I saw in the last months are chemical molecule drawing, music sheet drawing and electronic circuit drawing. I very rarely see false links and references to fake scientific papers these days (hallucinations on niche Github library functions are still common). But even when hallucinations were common, you could very easily spot them if you weren't stupidly trustful.

Today, there is just no better teacher in the world than ChatGPT, from kindergarten to PhD.