IdrisCytron · October 1, 2019 09:12 · dai63 · Jul 20, 2024 · LucianoBrill · Oct 5, 2024
diff --git a/ESP32WaterFlow.ino b/ESP32WaterFlow.ino
 /*
  Application:
  - Interface water flow sensor with ESP32 board.
  
  Board:
  - ESP32 Dev Module
    https://my.cytron.io/p-node32-lite-wifi-and-bluetooth-development-kit

  Sensor:
  - G 1/2 Water Flow Sensor
    https://my.cytron.io/p-g-1-2-water-flow-sensor
 */

 #define LED_BUILTIN 2
 #define SENSOR  27

 long currentMillis = 0;
 long previousMillis = 0;
 int interval = 1000;
 boolean ledState = LOW;
 float calibrationFactor = 4.5;
 volatile byte pulseCount;
 byte pulse1Sec = 0;
 float flowRate;
 unsigned int flowMilliLitres;
 unsigned long totalMilliLitres;

 void IRAM_ATTR pulseCounter()
 {
  pulseCount++;
 }

 void setup()
 {
  Serial.begin(115200);

  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(SENSOR, INPUT_PULLUP);

  pulseCount = 0;
  flowRate = 0.0;
  flowMilliLitres = 0;
  totalMilliLitres = 0;
  previousMillis = 0;

  attachInterrupt(digitalPinToInterrupt(SENSOR), pulseCounter, FALLING);
 }

 void loop()
 {
  currentMillis = millis();
  if (currentMillis - previousMillis > interval) {
    
    pulse1Sec = pulseCount;
    pulseCount = 0;

    // Because this loop may not complete in exactly 1 second intervals we calculate
    // the number of milliseconds that have passed since the last execution and use
    // that to scale the output. We also apply the calibrationFactor to scale the output
    // based on the number of pulses per second per units of measure (litres/minute in
    // this case) coming from the sensor.
    flowRate = ((1000.0 / (millis() - previousMillis)) * pulse1Sec) / calibrationFactor;
    previousMillis = millis();

    // Divide the flow rate in litres/minute by 60 to determine how many litres have
    // passed through the sensor in this 1 second interval, then multiply by 1000 to
    // convert to millilitres.
    flowMilliLitres = (flowRate / 60) * 1000;

    // Add the millilitres passed in this second to the cumulative total
    totalMilliLitres += flowMilliLitres;
    
    // Print the flow rate for this second in litres / minute
    Serial.print("Flow rate: ");
    Serial.print(int(flowRate));  // Print the integer part of the variable
    Serial.print("L/min");
    Serial.print("\t");       // Print tab space

    // Print the cumulative total of litres flowed since starting
    Serial.print("Output Liquid Quantity: ");
    Serial.print(totalMilliLitres);
    Serial.print("mL / ");
    Serial.print(totalMilliLitres / 1000);
    Serial.println("L");
  }
 }
	/*
	Application:
	- Interface water flow sensor with ESP32 board.

	Board:
	- ESP32 Dev Module
	https://my.cytron.io/p-node32-lite-wifi-and-bluetooth-development-kit

	Sensor:
	- G 1/2 Water Flow Sensor
	https://my.cytron.io/p-g-1-2-water-flow-sensor
	*/

	#define LED_BUILTIN 2
	#define SENSOR 27

	long currentMillis = 0;
	long previousMillis = 0;
	int interval = 1000;
	boolean ledState = LOW;
	float calibrationFactor = 4.5;
	volatile byte pulseCount;
	byte pulse1Sec = 0;
	float flowRate;
	unsigned int flowMilliLitres;
	unsigned long totalMilliLitres;

	void IRAM_ATTR pulseCounter()
	{
	pulseCount++;
	}

	void setup()
	{
	Serial.begin(115200);

	pinMode(LED_BUILTIN, OUTPUT);
	pinMode(SENSOR, INPUT_PULLUP);

	pulseCount = 0;
	flowRate = 0.0;
	flowMilliLitres = 0;
	totalMilliLitres = 0;
	previousMillis = 0;

	attachInterrupt(digitalPinToInterrupt(SENSOR), pulseCounter, FALLING);
	}

	void loop()
	{
	currentMillis = millis();
	if (currentMillis - previousMillis > interval) {

	pulse1Sec = pulseCount;
	pulseCount = 0;

	// Because this loop may not complete in exactly 1 second intervals we calculate
	// the number of milliseconds that have passed since the last execution and use
	// that to scale the output. We also apply the calibrationFactor to scale the output
	// based on the number of pulses per second per units of measure (litres/minute in
	// this case) coming from the sensor.
	flowRate = ((1000.0 / (millis() - previousMillis)) * pulse1Sec) / calibrationFactor;
	previousMillis = millis();

	// Divide the flow rate in litres/minute by 60 to determine how many litres have
	// passed through the sensor in this 1 second interval, then multiply by 1000 to
	// convert to millilitres.
	flowMilliLitres = (flowRate / 60) * 1000;

	// Add the millilitres passed in this second to the cumulative total
	totalMilliLitres += flowMilliLitres;

	// Print the flow rate for this second in litres / minute
	Serial.print("Flow rate: ");
	Serial.print(int(flowRate)); // Print the integer part of the variable
	Serial.print("L/min");
	Serial.print("\t"); // Print tab space

	// Print the cumulative total of litres flowed since starting
	Serial.print("Output Liquid Quantity: ");
	Serial.print(totalMilliLitres);
	Serial.print("mL / ");
	Serial.print(totalMilliLitres / 1000);
	Serial.println("L");
	}
	}