int a= 2;
int b= 3;
int c= 4;
int d= 5;
int e= 6;
int f= 7;
int g= 8;
void setup () 
{
  pinMode (a, OUTPUT);
  pinMode (b, OUTPUT);
  pinMode (c, OUTPUT);
  pinMode (d, OUTPUT);
  pinMode (e, OUTPUT);
  pinMode (f, OUTPUT);
  pinMode (g, OUTPUT);
  pinMode (A0, INPUT); 
}
void loop ()
{
int dato = analogRead (A0);
dato = map (dato , 0 , 1023 , 0 , 1);
if (dato == 0)
{
digitalWrite (a, 0);
digitalWrite (b, 0);
digitalWrite (c, 0);
digitalWrite (d, 0);
digitalWrite (e, 0);
digitalWrite (f, 0);
digitalWrite (g, 1);
}
else 
{ 
  digitalWrite (a, 1);
  digitalWrite (b, 0);
  digitalWrite (c, 0);
  digitalWrite (d, 1);
  digitalWrite (e, 1);
  digitalWrite (f, 1);
  digitalWrite (g, 1);
}
}