/*
  HC-SR04 Ultrasonic Sensor Example.

  Turn the LED on when an object is within 100cm range.

  Copyright (C) 2021, Uri Shaked
*/

#define ECHO_PIN 3
#define TRIG_PIN 2
#define ledMerah 7
#define ledKuning 6
#define ledHijau 5

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(ledMerah, OUTPUT);
  pinMode(ledKuning, OUTPUT);
  pinMode(ledHijau, OUTPUT);
}

float 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() {
  float distance = 400 - readDistanceCM();

 if(distance >= 75)
{
  digitalWrite(ledMerah, HIGH);
   digitalWrite(ledKuning, LOW);
    digitalWrite(ledHijau, LOW);
  Serial.println("Awas Banjir");
  Serial.println(F("Tinggi Genangan Air="));
  Serial.println(distance);
 } 
if(distance > 25 && distance <=75)
{
    digitalWrite(ledMerah, LOW);
   digitalWrite(ledKuning, HIGH);
    digitalWrite(ledHijau, LOW);
  Serial.println("Waspada");
  Serial.println(F("Tinggi Genangan Air="));
  Serial.println(distance);
 }
 if(distance<25)
{  
  digitalWrite(ledMerah, LOW);
   digitalWrite(ledKuning, LOW);
    digitalWrite(ledHijau, HIGH);
    Serial.println("Aman");
 }
  delay(1000);
}