#define ECHO_PIN 15
#define TRIG_PIN 2
void setup() {
Serial.begin(115200);
pinMode(LED_BUILTIN, OUTPUT);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
}
int readDistanceCM() {
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
int duration = pulseIn(ECHO_PIN, HIGH);
return duration * 0.034 / 2;
}
void loop() {
int distance = readDistanceCM();
bool jarak = distance < 100;
digitalWrite(LED_BUILTIN, jarak);
Serial.print("jarak sensor : ");
Serial.println(readDistanceCM());
delay(100);
}