////////////////// TO nano \\\\\\\\\\\\\
int blueLed = 12;
int delEndLoop = 100;
int a;
void setup()
{
 Serial1.begin(115200);
 Serial7.begin(9600);
 pinMode(blueLed, OUTPUT);
 }
void loop()
{
  Serial1.print(a);
  Serial1.println("allo");
  delay(delEndLoop);
  a++;
  if(digitalRead(blueLed)==0)
   {
   digitalWrite(blueLed,1);
   }
   else
   {
   digitalWrite(blueLed,0);
   }
  }