Just another program for my bot: 4 Ping sensors with Buzzer alarm (updated)

Projects Programming
11

Uncompiled, untested:

#define N_PINGS 4
const byte pingPins [N_PINGS] = {20, 21, 22, 23};
const int minRanges [N_PINGS] = {24, 24, 18, 60}; // for later.

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  int range [N_PINGS];
  for (int i = 0; i < N_PINGS; ++i) {
    range [i] = ping(pingPins [i]);
    delay(5);
  }  
  
  for (int i = 0; i < N_PINGS; ++i) {
    Serial.print(range [i]);
    Serial.print(" ");
  }  
  Serial.println("inches");
}
  
long ping(int pin)
{
  pinMode(pin, OUTPUT);
  digitalWrite(pin, LOW);
  delayMicroseconds(2);
  digitalWrite(pin, HIGH);
  delayMicroseconds(5);
  digitalWrite(pin, LOW);
  pinMode(pin, INPUT);
  
  return (microsecondsToInches(pulseIn(pin, HIGH)));
}

long microsecondsToInches(long microseconds)
{
  return microseconds / 74 / 2;
}

Reducing the limit in the "for" loops will allow you to concentrate on just one sensor.