Okay guys so to be quick and clear i'm trying to use an grove lcd rgb backlight display ( you can find every information on it here) So i install this librairie on my computer I open the example hello word upload it try it on every pin (with 5vcc) and it don't work (i'm using a grove shield). So i looked every where didn't find anything (maybe i didn't search well in half :( ) It would be glad if someone could help me fast. THanks for reading, Tanguy