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	- Project: Ultrasonic Indicator
	- Source Code compiled for: Arduino Uno
	- Source Code created on: 2024-04-17 14:09:14

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* water level indicator */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include  // https://github.com/ErickSimoes/Ultrasonic

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs(void);
void checkWaterLevel(unsigned int distance);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t US_HC_SR04_Echo_PIN_D3 = 3;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t US_HC_SR04_Trigger_PIN_D2 = 2;
const uint8_t WATER_LEVEL_INDICATOR_PIN = 4;

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
/***** used to store raw data *****/
bool US_HC_SR04_Trigger_PIN_D2_rawData = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float US_HC_SR04_Trigger_PIN_D2_phyData = 0.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
Ultrasonic ultrasonic(US_HC_SR04_Trigger_PIN_D2, US_HC_SR04_Echo_PIN_D3);

void setup(void)
{
  // put your setup code here, to run once:
  pinMode(US_HC_SR04_Echo_PIN_D3, INPUT);
  pinMode(US_HC_SR04_Trigger_PIN_D2, OUTPUT);
  pinMode(WATER_LEVEL_INDICATOR_PIN, OUTPUT);
  Serial.begin(9600); // Initialize serial communication
}

void loop(void)
{
  // put your main code here, to run repeatedly:
  updateOutputs(); // Refresh output data

  // Read distance from ultrasonic sensor
  unsigned int distance = ultrasonic.read();

  // Print distance in centimeters
  Serial.print("Distance in CM: ");
  Serial.println(distance);

  // Check water level and update the indicator
  checkWaterLevel(distance);

  delay(1000);
}

void updateOutputs(void)
{
  digitalWrite(US_HC_SR04_Trigger_PIN_D2, US_HC_SR04_Trigger_PIN_D2_rawData);
}

void checkWaterLevel(unsigned int distance)
{
  // Define the threshold distance for water level
  const unsigned int WATER_LEVEL_THRESHOLD = 10;

  if (distance <= WATER_LEVEL_THRESHOLD)
  {
    // Water level is low, turn on the indicator
    digitalWrite(WATER_LEVEL_INDICATOR_PIN, HIGH);
  }
  else
  {
    // Water level is normal, turn off the indicator
    digitalWrite(WATER_LEVEL_INDICATOR_PIN, LOW);
  }
}