Measuring Water Usage with NodeMCU +WaterFlow Sensor

README.MD

PENDAHULUAN

Internet of Things yang bisa disebut dengan IoT menjadi bagian yang penting dalam kemajuan teknologi. Contohnya adalah dengan mengirimkan data penggunaan air dari sensor ke cloud sehingga bisa dengan mudah melihat hasilnya. Untuk mengirimkan data penggunaan air dari sensor ke cloud maka dibutuhkan internet. Sehingga jika berbicara tentang IoT maka kira berbicara tidak terlepas dari 2 hal, yaitu: sensor dan internet.

PERANGKAT KERAS YANG DIBUTUHKAN

• NodeMCU Lua WiFi (Rp85.000)
• Water Flow Sensor (Rp70.000)
• Lampu LED (Rp350)
• Jumper + Breadboard (Rp36.000)
• Kabel Power Micro USB

PERANGKAT LUNAK

• Arduino IDE. Unduh di https://www.arduino.cc/en/Main/Software

PERANGKAT PENDUKUNG

Data dari sensor akan disimpan pada layanan cloud https://emoncms.org/

CARA KERJA

Setelah power dinyalakan, sistem akan mendeteksi ketersediaan koneksi WiFi dengan konfigurasi yang sebelumnya sudah dimasukkan ke dalam program. Selagi proses menghubungkan ke WiFI, lampu LED Indicator akan menyala (lihat lampiran di bawah), jika WiFi berhasil maka lampu LED Indicator akan mati.

Lampu LED Indicator akan menyala (lihat lampiran di bawah) jika ada air melewati sensor yang dilanjutkan dengan pengiriman data ke cloud.

Air yang melewati sensor akan menggerakan rotor menyebabkan adanya perputaran. Sensor ini, setiap liter air yang dialirkan per menit mengeluarkan kurang lebih 4.5 pulse, angka tersebut yang akan dijadikan kalibrasi.

MENGHUBUNGKAN WATER FLOW SENSOR DENGAN NODEMCU

Mengubungkan water flow sensor dengan NodeMCU membutuhan 3 kabel yang berasal dari sensor, yaitu:

• Kabel kuning (signal/pulse) dihubungkan ke pin D2
• Kabel hitam (ground) dihubungkan ke pin GND
• Kabel merah dihubungkan ke pin 3V3

MENGHUBUNGKAN LED DENGAN NODEMCU

Menghubungkan LED dengan NodeMCU membutuhkan 2 kabel, yaitu:

• Kabel signal dihubungkan ke pin D7
• Kabel ground dihubungkan ke pin GND

BENTUK AKHIR

waterflow.ino

// Credit:
// - https://diyhacking.com/arduino-flow-rate-sensor
// - http://www.instructables.com/id/Flowmeter-NodeMcu-Counting-Litres/

#include <Arduino.h> 
#include <EEPROM.h> 
#define USE_SERIAL Serial
#include <ESP8266WiFi.h> 
#include <ESP8266HTTPClient.h>

// Variable init
const int buttonPin = D2; // variable for D2 pin
const int ledPin = D7;
char push_data[200]; //string used to send info to the server ThingSpeak
int addr = 0; //endereço eeprom
byte sensorInterrupt = 0; // 0 = digital pin 2

// The hall-effect flow sensor outputs approximately 4.5 pulses per second per
// litre/minute of flow.
float calibrationFactor = 4.5;

volatile byte pulseCount;

float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;

unsigned long oldTime;

//SSID and PASSWORD for the AP (swap the XXXXX for real ssid and password )
const char * ssid = "<NETWORK_NAME>";
const char * password = "<NETWORK_PASSWORD>";

//HTTP client init
HTTPClient http;

void setup() {
    Serial.begin(115200); // Start the Serial communication to send messages to the computer
    delay(10);
    Serial.println('\n');

    startWIFI();
  
    // Initialization of the variable “buttonPin” as INPUT (D2 pin)
    pinMode(buttonPin, INPUT);
  
    // Two types of blinking
    // 1: Connecting to Wifi
    // 2: Push data to the cloud
    pinMode(ledPin, OUTPUT); 
    
    pulseCount = 0;
    flowRate = 0.0;
    flowMilliLitres = 0;
    totalMilliLitres = 0;
    oldTime = 0;

    digitalWrite(buttonPin, HIGH);
    attachInterrupt(digitalPinToInterrupt(buttonPin), pulseCounter, RISING);

}

void loop() {
    if (WiFi.status() == WL_CONNECTED && (millis() - oldTime) > 1000) // Only process counters once per second
    {
        // Disable the interrupt while calculating flow rate and sending the value to
        // the host
        detachInterrupt(sensorInterrupt);

        // 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() - oldTime)) * pulseCount) / calibrationFactor;

        // Note the time this processing pass was executed. Note that because we've
        // disabled interrupts the millis() function won't actually be incrementing right
        // at this point, but it will still return the value it was set to just before
        // interrupts went away.
        oldTime = 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;

        unsigned int frac;

        // 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("."); // Print the decimal point
        // Determine the fractional part. The 10 multiplier gives us 1 decimal place.
        frac = (flowRate - int(flowRate)) * 10;
        Serial.print(frac, DEC); // Print the fractional part of the variable
        Serial.print("L/min");
        // Print the number of litres flowed in this second
        Serial.print("  Current Liquid Flowing: "); // Output separator
        Serial.print(flowMilliLitres);
        Serial.print("mL/Sec");

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

        if (flowRate > 0) {
            digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
            delay(100);          

            // Replace <YOUR_API_KEY> with your EmonCMS API Key 
            sprintf(push_data, "http://emoncms.org/input/post?json={frac:%d.%d,flowml:%d,totalml:%d}&node=Penampung2&apikey=<YOUR_API_KEY>", int(flowRate), int(frac), flowMilliLitres, totalMilliLitres);
            Serial.printf("%s\n", push_data);
            http.begin(push_data);
            digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
            delay(100);              
            int httpCode = http.GET();
            // httpCode_code will be a negative number if there is an error
            Serial.print(httpCode);
            if (httpCode > 0) {
                digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
                delay(100);              
                // file found at server
                if (httpCode == HTTP_CODE_OK) {
                    String payload = http.getString();
                    Serial.print(" ");
                    Serial.print(payload);
                }
                digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
                delay(100);              
            } else {
                Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
            }
            http.end();
        }
        // Reset the pulse counter so we can start incrementing again
        pulseCount = 0;

        // Enable the interrupt again now that we've finished sending output
        attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
    } else if (WiFi.status() != WL_CONNECTED) {
        startWIFI();
    }
}

/*
Insterrupt Service Routine
 */
void pulseCounter() {
    // Increment the pulse counter
    pulseCount++;
}

void startWIFI(void) {
    digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(100);              
    
    WiFi.begin(ssid, password); // Connect to the network
    Serial.print("Connecting to ");
    Serial.print(ssid);
    Serial.println(" ...");
    oldTime = 0;
    int i = 0;
    digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
    delay(100);         
    
    while (WiFi.status() != WL_CONNECTED) { // Wait for the Wi-Fi to connect
        digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
        delay(2000);
        Serial.print(++i);
        Serial.print('.');
        digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
        delay(100);  
    }
    delay(2000);
    Serial.print('\n');
    Serial.print("Connection established!");
    Serial.print("IP address:\t");
    Serial.print(WiFi.localIP()); // Send the IP address of the ESP8266 to the computer

}

why can't my waterflow read
`// Inisialisasi pin sensor water flow
const int flowPin = 2; // Pin sensor water flow terhubung ke pin digital 2

// Variabel global
volatile int pulseCount; // Jumlah pulse dari sensor
float flowRate; // Debit air dalam liter per menit
unsigned int flowMilliLitres; // Total volume air yang telah mengalir dalam mililiter
unsigned long totalMilliLitres; // Total volume air yang telah mengalir dalam mililiter (total akumulasi)

unsigned long oldTime; // Waktu terakhir ketika pulse terdeteksi

// Variabel untuk kalibrasi
float calibrationFactor = 4.5; // Faktor kalibrasi
void ICACHE_RAM_ATTR pulseCounter();
void setup() {
// Mengaktifkan serial communication
Serial.begin(9600);

// Mengatur pin sensor water flow sebagai input dan mengaktifkan pull-up resistor internal
pinMode(flowPin, INPUT_PULLUP);

// Reset semua variabel
pulseCount = 0;
flowRate = 0.0;
flowMilliLitres = 0;
totalMilliLitres = 0;
oldTime = 0;

// Menginisialisasi interrupt
attachInterrupt(digitalPinToInterrupt(flowPin), pulseCounter, FALLING);
}

void loop() {
unsigned long currentTime = millis();

// Menghitung selang waktu sejak deteksi pulse terakhir
unsigned long elapsedTime = currentTime - oldTime;

// Mengupdate waktu terakhir ketika pulse terdeteksi
oldTime = currentTime;

// Menghitung debit air dalam liter per menit
flowRate = ((1000.0 / elapsedTime) * pulseCount) / calibrationFactor;

// Menghitung volume air yang telah mengalir dalam mililiter
flowMilliLitres = (flowRate / 60) * 1000;

// Mengakumulasi total volume air yang telah mengalir
totalMilliLitres += flowMilliLitres;

// Mengatur ulang jumlah pulse
pulseCount = 0;

// Menampilkan hasil ke Serial Monitor
Serial.print("Debit Air: ");
Serial.print(flowRate);
Serial.print(" L/min | Total Volume Air: ");
Serial.print(totalMilliLitres);
Serial.println(" mL");

delay(5000);
}

void pulseCounter() {
// Meningkatkan jumlah pulse
pulseCount++;
}
`