#define trig1 A0
#define echo1 A1
#define RED_LED 2
#define GREEN_LED 4
#define IR 7
void setup() {
  // put your setup code here, to run once:
  pinMode(A0, OUTPUT);
  pinMode(A1, INPUT);
  pinMode(2, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(7,INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
d=t*0.0343/2
Sensor1=analogRead(A0,A1);
if(Sensor1<50)
{
  digitalWrite(2,HIGH);
  digitalWrite(4,LOW);
  delay(50);
}
else
{
  digitalWrite(2, LOW);
  delay(50);
}
Sensor2=digitalRead(7);
if(Sensor2==1)
{digitalWrite(4, HIGH);
  digitalWrite(2, LOW);
  delay(50);
  }
else
{
  digitalWrite(4, LOW);
  delay(50);
}
}