The Ultrasonic sensor just detects the same distance
First of all you need to make cm, inches and duration float to be more precise. Second, you need to make the delay 2 and 10 microseconds between triggers. Overall, if I'm not wrong you can use the code below without changing your circuit.

int tPin = 11;
int ePin = 12;
float duration, inches, cm; //floating numbers to make the result more precise

void setup()
{
    Serial.begin(9600);
    pinMode(tPin, OUTPUT);
    pinMode(ePin, INPUT);
    pinMode(2, OUTPUT);
}

void loop()
{
    digitalWrite(tPin, LOW);
    delayMicroseconds(2);         //Delay 2 microseconds
    digitalWrite(tPin, HIGH);
    delayMicroseconds(10);        //Delay 10 microseconds
    digitalWrite(tPin, LOW);
    duration = pulseIn(ePin, HIGH);
    cm = duration / 58.2;          //Instead of duration/2/28.1
    inches = cm / 2.54;            //You can use cm that was created before for conversion
    Serial.print(inches);
    Serial.print("in, ");
    Serial.print(cm);
    Serial.print("cm");
    Serial.println();
    delay(100);

    if (inches &lt;= 10) {
        digitalWrite(2, HIGH);
        delay(50);
        digitalWrite(2, LOW);
        delay(50);
    }
    else {
        digitalWrite(2, HIGH);
        delay(500);
        digitalWrite(2, LOW);
        delay(500);
    }
}