const int trigger_pin = 13;
const int echo_pin = 12;
const int buzzer = 2;
const int mled = 3;
const int yled = 4;
const int sled = 5;
const int kled = 6;
int sure ;
int mesafe ;
void setup() {
pinMode(kled , OUTPUT);
pinMode(sled , OUTPUT);
pinMode(yled , OUTPUT);
pinMode(mled , OUTPUT)...