I've correctly tested an ESP32-WROVER MicroController and an ADXL355 sensor. Both these devices are on evaluation boards and the fact is that they are very handy: the MCU include an USB female, a battery case with a recharging system from the USB, a switch for turning on/off the system and most common protection systems for the hardware. The evaluation board of the device includes recommended protections from the datasheet.
If I was to implement all these nice features it would take me years and I don't think I could accommodate them in a smaller space.
That said, now I want to reproduce this system and maybe also sell this: is there something wrong with keeping on using these evaluation boards?
Best Answer
One obvious problem is that evaluation boards and other demo products intended solely for the purpose of professional R&D are explicitly except from all manner of conformance requirements, pretty much world-wide.
So it is quite unlikely that the manufacturer will make any guarantees about EMC, radio and similar. How do you plan to claim conformance without any such guarantees? Enlisting a test house to verify this will be vastly more expensive than anything you mention. Self-certification for CE marking etc would be highly questionable if you include some 3rd party device that you have no clue about how it performs EMC- and radio-wise.
In this specific case, it would seem that the manufacturer might make some guarantees though. https://www.espressif.com/en/support/documents/certificates. Check out if the documents apply to the countries where you plan to sell the product.