#define trig1 11
#define echo1 10
#define trig2 7
#define echo2 6

void setup() {
  pinMode(trig1, OUTPUT);
  pinMode(echo1, INPUT);
  pinMode(trig2, OUTPUT);
  pinMode(echo2, INPUT);
  Serial.begin(9600);
}

void check_distance (int trig, int echo) {
  digitalWrite(trig, LOW);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  long t = pulseIn(echo, HIGH);
  int distance = t * 0.01715 ;
  Serial.print("t=" + String(t) + "usec");
  Serial.println("\t d=" + String(distance) + "cm");
}

void loop() {
  check_distance(trig1, echo1);
  check_distance(trig2, echo2);
  delay(100);
}