I am going to be selling my project, Super OSD. It has a 3 MHz SMPS PSU and an 8 MHz crystal oscillator, but is not intended to emit radio signals. Will it be necessary to get testing to sell in Europe? I am selling from Europe, the UK to be specific.
Electronic – What certification is needed for electronic devices in Europe
emclegal
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Your general crystal layout looks pretty good. I've seen plenty of examples that were 10 to a 100 times worse than what you show here!
Have you considered the possibility of using an MCU that has its own onboard oscillator thus eliminating the need for concerns about an external crystal?
Is there any possibility that you can share some other frequency source to drive the MCU such that the source generator is away from the motor and WiFi module?
What is the dead ended trace as highlighted here in yellow area? Is that an intentional trace to shield the two adjacent traces from each other? If it is GND shield trace would it be in need of a via a several spots to tie it into the GND plane?
In my experience, the WiFi module supplier will have programmed test modes into the module that support the testing that is required for product certification. Hopefully your supplier has done so as well.
The problem I've seen is that the documentation for these modes is not publicly available, so we have to call and establish an engineering relationship to get it. Often times it is not as stable as we'd like (meaning: we've seen "undocumented features" in test modes).
My group had to hound a very large and well known silicon manufacturer to get their certification documentation (which we found was incomplete and nudged them to get it up to date) and information on how the test API worked. Once we got it, we wrote custom test software packages to set up the proper transmission for the proper test.
We included a user interface since fiddling with software configurations at a test lab is the wrong place to be doing that - better to make it quick, easy and foolproof.
When we started with WiFi modules, we thought that it was super easy - simply put the module into the product and use it in the way that it was certified by the manufacturer, put their FCC ID on the sticker and done. Not so. WiFi module manufacturers may not certify to all product applications - or in fact only a few generic ones - and so you may find yourself having to go to the lab for a wireless cert because you put it in a product whose application didn't conform to the FCC cert the module manufacturer did.
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Best Answer
To sell in the EU, you will need a CE mark, wheelie bin logo (WEEE) and RoHS statement. You do not need to use an EU test house, but do need to be able to provide evidence to the authorities upon request for all of these.
If you are manufacturing in China, they will generally provide you with a RoHS statement. If buying from China they will also provide the CE Mark (remember to ask for documentation).
Not sure about what is required to get an FCC mark.