USsensorDCMotor

#define trig 7
#define echo 8
#define enaPin 9
#define motor1 10
#define motor2 11
#define redLed 5

long distance, duration;

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(enaPin, OUTPUT);
  pinMode(motor1, OUTPUT);
  pinMode(motor2, OUTPUT);
  pinMode(redLed, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  duration = pulseIn(echo, HIGH);
  distance = duration / 29 / 2;

  if (distance > 50) {
    analogWrite(enaPin, 250);
    digitalWrite(motor1, HIGH);
    digitalWrite(motor2, LOW);
    digitalWrite(redLed, LOW);
  }
  else {
    digitalWrite(redLed, HIGH);
    for (int Speed = 250; Speed >= 0; Speed = Speed - 10) {
      analogWrite(enaPin, Speed);
      digitalWrite(motor1, HIGH);
      digitalWrite(motor2, LOW);
    }
  }
}