void setup() 
{
for (int port=0;port<=7;port ++)
{
  pinMode(port, OUTPUT);
}

pinMode(A0, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

for (int port=0;port<=7;port ++)
{
  digitalWrite(port, HIGH);
  int rychlost=analogRead(A0);
  rychlost = map(rychlost,0,1023,100,1000);
  delay(rychlost);  
  digitalWrite(port, LOW);
}
 
for (int port=7;port>0;port --)
{
  digitalWrite(port, HIGH);
  int rychlost=analogRead(A0);
  rychlost = map(rychlost,0,1023,100,1000);
  delay(rychlost);  
  digitalWrite(port, LOW);
}

  
}