#define relay 15
#define ptrig 2
#define eko 4




void setup(){
pinMode(ptrig, INPUT);
pinMode(relay, OUTPUT);
pinMode(eko, OUTPUT);

}

void loop(){
digitalWrite(ptrig, HIGH);
delayMicroseconds(2);
digitalWrite(ptrig, LOW);
delayMicroseconds(10);
digitalWrite(eko, HIGH);
delayMicroseconds(100);
digitalWrite(eko, LOW);
delayMicroseconds(1000);


digitalWrite(relay, HIGH);
delay(1000);
digitalWrite(relay, LOW);
delay(1000);

}