Is my Arduino Uno broken?

Development Tools IDE 1.x
1

Hi, I have an Arduino Uno, which has been running into a few problems lately.

I've been using it with a range finder with a piezo alarm, which worked perfectly with no issues since pretty much when I made it, until earlier I tried it and the pin which made the rangefinder ping stopped working. I had also programmed it so that it wouldn't turn on the piezo if it recieved 0 as a distance (in case it errors) but when I plug it in, the rangefinder never does anything and it turns on the piezo and it doesn't stop!
I'm using this script:

const int inping = 3;
const int outping = 5;
const int response = 4;

void setup() {
  pinMode(11,OUTPUT);
  pinMode(3,OUTPUT);
  Serial.begin(9600);
  pinMode(inping,INPUT);
  pinMode(outping,OUTPUT);
}

void loop() {
  long duration, inches, cm;

  Serial.println("Starting Pulse");
  digitalWrite(outping, LOW);
  delayMicroseconds(2);
  digitalWrite(outping, HIGH);3
  delayMicroseconds(5);
  digitalWrite(outping, LOW);
  Serial.println("Pulse Finished");
  
  duration = pulseIn(inping, HIGH,20000);

  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);

  if (cm < 60 != 0) {
    alarm(); 
  }
  Serial.print(cm);
  Serial.print("\n");
  delay(10);
}

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

long microsecondsToCentimeters(long microseconds) {
  return microseconds / 29 / 2;
}

void alarm() {
  for (int i = 0; i < 255; i++) {
    tone(response,i);
    delay(10);
  }
  noTone(response);
}

Then to test the pins, I made this simple test script and changed the outping pin to test each one:

const int outping = 4;

void setup() {
  // put your setup code here, to run once:
  pinMode(outping,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(outping, HIGH);
  delay(200);
  digitalWrite(outping, LOW);
  delay(200);

}

I attatched an LED to the pin I was testing each time, and it NEVER lit up!
Even though the speaker pin for the previous script worked, I have no idea why it didn't work this time?

Is my Arduino Uno broken because it's ignoring parts of my script and pins work 50% of the time?

2

Is the led in the correct way? Post the circuit you used previously. It might have damaged the pin over time.