Ouch! If needed, I can use my (official) Arduino board + Ethernet shield for this project 
Same board used for the FlowerDuino project.
It’s the only way because I don’t have other Arduino board 
It’s just much more transportable / easy to plug / smaller with Wifi connection but it’s not mandatory. It’s also working with Arduino + Ethernet shield.
To configure wifi or ethernet, please select the right library:
//wifi
include "CayenneWiFiClient.h"
or
//ethernet
include "CayenneEthernet.h"
This is the only way for me to run FlowerDuino (ethernet connection) and this project (wifi connection) at the same time in my living room.
What’s the best way to have wifi on Arduino board ? Could you advise me an ethernet shield ?
Don’t hesitate to tell me if I have to update my project / code / photos with my Arduino + Ethernet shield to take part in this contest.
Ben