#include <NewPing.h> 
#define trig_L 3
#define trig_R 2
#define echo_L 5
#define echo_R 4


NewPing sensor_lx(trig_L,echo_L,400);   //creating two new object
NewPing sensor_rx(trig_R,echo_R,400);

int timer_L=29;    //microsecond that must occur between two ping request for the same sensor  
int timer_R=29;

float data_L,data_R;      //where the data is store before to be sent to Processing

unsigned int time_l=0;   //variables that contains the timestamp when last ping was done
unsigned int time_r=0;


void setup() {
    unsigned long time = 0;  
    
    Serial.begin(115200);    // I start the serial begin for debugging
    Serial.println("test");  // I make a test print
    Serial.println("\n ");

}

void loop() {
 
  

      if (millis() - time_l > timer_L){
          time_l =millis();
          data_L = sensor_lx.ping_cm();
          Serial.print("sensore_L:");
          Serial.print(data_L);
          Serial.print("\t");
      }

      if (millis()- time_r > timer_R){
         time_r =millis();
         data_R = sensor_rx.ping_cm();
         Serial.print("sensore_R:");
         Serial.print(data_R);
         Serial.print("\n");
      }

 
  
}