Hall_test.ino

void setup() {

  // put your setup code here, to run once:

  pinMode(A12, OUTPUT);

  pinMode(A13, OUTPUT);

  pinMode(A14, OUTPUT);

  pinMode(A15, OUTPUT);

  digitalWrite(A2, HIGH);

  digitalWrite(A13, HIGH);

  digitalWrite(A14, HIGH);

  digitalWrite(A15, HIGH);

  pinMode(A0, INPUT);

  pinMode(A1, INPUT);

  pinMode(A2, INPUT);

  pinMode(A3, INPUT);

  pinMode(A4, INPUT);

  pinMode(A5, INPUT);

  pinMode(A6, INPUT);

  pinMode(A7, INPUT);

  Serial.begin(9600);

}

void loop() {

  delay(1000);

  digitalWrite(A12, HIGH);

  digitalWrite(A13, HIGH);

  digitalWrite(A14, HIGH);

  digitalWrite(A15, HIGH);

  //delay(1);

  digitalWrite(A12, HIGH);

  digitalWrite(A13, LOW);

  digitalWrite(A14, LOW);

  digitalWrite(A15, LOW);

  delay(1);

  Serial.write("COL A-2\n");

  for(int i = 0; i < 8; i++){

    if(digitalRead(A0+i) == LOW){

      Serial.write("1");

      }

     else{

      Serial.write("0");

     }

  }

  Serial.write("\n");

}