const int LDR_PIN = A0;
const int TRIG_PIN = 9;
const int ECHO_PIN = 10;
const int LED_PIN = 13;
void setup() {
Serial.begin(9600);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
pinMode(LED_PIN, OUTPUT);
}
int LDR() {
int ldrValue = analogRead(LDR_PIN);
if (ldrValue < 500) {
Serial.println("LIGHT LOW");
digitalWrite(LED_PIN, HIGH); // Turn on LED for indication
return 1;
} else {
digitalWrite(LED_PIN, LOW); // Turn off LED
return 0;
}
}
int Ultrasonic() {
long duration, distance;
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
duration = pulseIn(ECHO_PIN, HIGH);
distance = duration * 0.034 / 2;
if (distance < 20) {
Serial.println("DISTANCE NEAR");
digitalWrite(LED_PIN, HIGH); // Turn on LED for indication
return 1;
} else {
digitalWrite(LED_PIN, LOW); // Turn off LED
return 0;
}
}
void loop() {
int dataArray[] = {1, 2, 3};
for (int i = 0; i < 3; i++) {
int sensorType = dataArray[i];
if (sensorType == 1) {
if (LDR() == 1) {
} else {
}
}
else if (sensorType == 2) {
if (Ultrasonic() == 1) {
} else {
}
}
else if (sensorType == 3) {
Serial.println("DONE");
digitalWrite(LED_PIN, LOW);
}
delay(1000); // Delay for stability
}
}