// 2026-06-06 // by chrissy
The Flower-Badge is a nice little gadget from the 2023s Chaos Comminication Camp. It consists of two flower shaped PCBs with a round RGB OLED-Display in the middle, provides several capacitive touch buttons, speakers, an audio input and an audio output.
Here are some hardware specs copied from the original docs:
So how to determine, what standards and limits one should apply to evaluate the EMC compliance of that nice little thing? Based on the usecase of this little Flow3r, one can assume, that it is likely classified as a multimedia device and with that information, we can have a brief look at CISPR 32 and CISPR 35 for limits and test procedures.
I set the limit for me not to do anything really harmful to this device - because since this particular thing is just borrowed from a friend of mine, I will omit all tests that will probably do permanent damage to the hardware. That includes specifically ESD, Burst and Surge. So I narrow all tests down to conducted emmission, conducted immunity, radiated emmission and immunity as well as some fun with near field probes.
To start with something easy to handle, I had a look at the conducted emmission characteristics of this cute little thingy. From Sarah [REF] I got a nice little USB-C Power Delivery LISN [REF]. With its help, I investigated a few configurations, starting with the Flow3r Badge beeing charged by a common USB C wall charger.
Turns out, the Fl0w3rs conducted emission from 9 kHz to 30 MHz remain under the limit.
Since the LISN’s frequency range extends up to 200 MHz it might be a
good idea to have a look at this extended frequency range, despite the
fact, that the limits for conducted emission are just defined in a
frequency range up to 30 MHz. 
With the help of a Spectrum Analyzer I was able to get a spectrum of the conducted emission in a reasonable frequency range from 9 kHz to 1 GHz.
