const int trig_pin = 13;
const int echo_pin = 12;
const int ldr_pin = A0;
const int pir_pin = 7;
const int relay_pin = 6;
const int pot_pin = A1;

int ldr_threshold = 500;
int distance_threshold = 200;


int ldr_value;
int pir_value;
int distance;
long duration;
bool relay_state = LOW;


void setup() {
  pinMode(trig_pin, OUTPUT);
  pinMode(echo_pin, INPUT);

  pinMode(pir_pin, INPUT);
  pinMode(relay_pin, OUTPUT);
}

void loop() {
  

}