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Measuring Water Usage with NodeMCU +WaterFlow Sensor

esp layout single

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

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

nodemcu waterflow connection

MENGHUBUNGKAN LED DENGAN NODEMCU

Menghubungkan LED dengan NodeMCU membutuhkan 2 kabel, yaitu:

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

nodemcu led connection

BENTUK AKHIR

nodemcu breadboard

// 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
}
@Chester547

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commented Jun 19, 2019

Hello, maybe you can help me, please I need to measure the flow with the same sensor and nodeMCU, but I need to receive the data by serial monitor, I have tried several methods but I have not obtained any results, maybe you can help me?

@gururajksa

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commented Jul 24, 2019

Hi, i have uploaded the sketch and done the SSID/Password changes. The code is uploaded on to NodeMCU Arduino D1 board.
I am getting the flow on the Serial Monitor but i wanted date and time stamp along with the flow inputs. Can i get the sketch to have Date and time included?
Also on to which cloud http is the data sending, where do I specify the same?

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