DIY/parts are a fuzzy area and might not need the certification, but the board at your first link does have a huge CE print near the LEDs. Edit: I found this M

DIY/parts are a fuzzy area and might not need the certification, but the board at your first link does have a huge CE print near the LEDs. Edit: I found this Make article (paywalled and in German) a good overview for makers wanting to sell hardware in the EU: https://www.heise.de/select/make/2017/6/1513996282631753 https://www.heise.de/select/make/2017/6/1513996282631753