To control a 7-segment display ("afficheur segment") with an Arduino, you can download specialized libraries through the Arduino IDE Library Manager. The most common library for this purpose is .
Here is how to get set up with the "solid piece" (likely a 1-digit or 4-digit common anode/cathode module): 1. Download/Install the Library
Open Arduino IDE, go to Sketch > Include Library > Manage Libraries... , search for "SevSeg by Dean Reading" , and click Install.