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/* Connections should be made as follows
  Pin      Pin
  Gnd -->  2
  5v  -->  3
  10  -->  4
  11  -->  5
  12  -->  6
  13  -->  7
*/
void setup() {
  Serial.begin(9600);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(7, INPUT);
  pinMode(6, INPUT);
  pinMode(5, INPUT);
  pinMode(4, INPUT);
  pinMode(3, INPUT);
  pinMode(2, INPUT_PULLUP);
}

void loop() {
  digitalWrite(10, HIGH);
  if (digitalRead(4) == LOW) {
    Serial.println("Check the wire going from pin 10 to 4")
  }
  digitalWrite(10, LOW);

  digitalWrite(11, HIGH);
  if (digitalRead(5) == LOW) {
    Serial.println("Check the wire going from pin 11 to 5")
  }
  digitalWrite(11, LOW);

  digitalWrite(12, HIGH);
  if (digitalRead(6) == LOW) {
    Serial.println("Check the wire going from pin 12 to 6")
  }
  digitalWrite(12, LOW);

  digitalWrite(13, HIGH);
  if (digitalRead(7) == LOW) {
    Serial.println("Check the wire going from pin 13 to 7")
  }
  digitalWrite(13, LOW);

  if (digitalRead(3) == LOW) {
    Serial.println("Check the wire going from 5v to pin 3")
  }

  if (digitalRead(2) == HIGH) {
    Serial.println("Check the wire going from GND to pin 2")
  }
}