Most recent working file with correct pins

Main_working2/Main_working2.ino

+const int trig_pin_left = 9;
+const int echo_pin_left = 8;
+
+const int trig_pin_mid = 7;
+const int echo_pin_mid= 6;
+
+const int trig_pin_right = 5;
+const int echo_pin_right = 4;
+
+void setup() {
+  // put your setup code here, to run once:
+  // add reading of specific pins
+  pinMode(trig_pin_left, OUTPUT); 
+  pinMode(echo_pin_left, INPUT); 
+  
+  pinMode(trig_pin_mid, OUTPUT); 
+  pinMode(echo_pin_mid, INPUT); 
+  
+  pinMode(trig_pin_right, OUTPUT); 
+  pinMode(echo_pin_right, INPUT); 
+  
+  Serial.begin(9600); // Starts the serial communication
+}
+
+long calculate_distance(long duration) {
+  return duration / 58.2; 
+}
+
+long read_pin(int trig_pin, int echo_pin, int start_microseconds, int end_microseconds) {
+  digitalWrite(trig_pin, LOW);
+  delayMicroseconds(start_microseconds);
+
+  digitalWrite(trig_pin, HIGH);
+  
+  delayMicroseconds(end_microseconds);
+  digitalWrite(trig_pin, LOW);
+
+  return pulseIn(echo_pin, HIGH);
+}
+
+void read_inputs(long * datapoints) {
+  long duration_left = read_pin(trig_pin_left, echo_pin_left, 2, 10);
+  datapoints[0] = calculate_distance(duration_left);
+  
+  long duration_mid = read_pin(trig_pin_mid, echo_pin_mid, 2, 10);
+  datapoints[1] = calculate_distance(duration_mid);
+
+  long duration_right = read_pin(trig_pin_right, echo_pin_right, 2, 10);
+  datapoints[2] = calculate_distance(duration_right);
+}
+
+void print_sensors(long * data) {
+  Serial.print("Sensor Data: ");
+  Serial.print(data[0]);
+  Serial.print(" ");
+  Serial.print(data[1]);
+  Serial.print(" ");
+  Serial.print(data[2]);
+  Serial.println();
+}
+
+long average(long a, long b) {
+  return (a + b) / 2;
+}
+
+bool check_against(long a, long b, long comp) {
+  long avg = average(a, b);
+  return abs(avg - comp) > 30;
+}
+
+
+void loop() {
+  long data[3];
+  read_inputs(data);
+  print_sensors(data);
+  bool check_right = check_against(data[0], data[1], data[2]);
+  bool check_left = check_against(data[1], data[2], data[0]);
+  bool check_mid = check_against(data[0], data[2], data[1]);
+  
+  if (check_right || check_left || check_mid) {
+    Serial.println("There seems to be an object in the way...");
+  }
+}