void setup() {
  pinMode(A0, OUTPUT);
  pinMode(A1, OUTPUT);
  pinMode(A2, OUTPUT);
  pinMode(A3, OUTPUT);
  pinMode(A4, OUTPUT);
  pinMode(A5, OUTPUT);
  pinMode(A6, OUTPUT);
  pinMode(A7, OUTPUT);
  pinMode(A15, INPUT);
  Serial.begin(115200);

}

byte i = 0;
int t = 10;

void loop() {
  

  digitalWrite(A0,(i&0x01));
  delay(t);
  digitalWrite(A1,(i&0x02));
  delay(t);
  digitalWrite(A2,(i&0x04));
  delay(t);
  digitalWrite(A3,(i&0x08));
  delay(t);
  digitalWrite(A4,(i&0x10));
  delay(t);
  digitalWrite(A5,(i&0x20));
  delay(t);
  digitalWrite(A6,(i&0x40));
  delay(t);
  digitalWrite(A7,(i&0x80));
  Serial.println(analogRead(A15));
  delay(t);

  i++;

}