Tan Wei KangKhilfie Adly B MuhlanSoh Wei Kang
Published

Smart Building: Household Utility Monitoring System

Use flow rate sensor to capture water consumption in household and provide visual information via web apps.

BeginnerFull instructions providedOver 3 days162

Things used in this project

Hardware components

Arduino Nano R3
Arduino Nano R3
×1
SiPy
Pycom SiPy
×1
60W PCIe 12V 5A Power Supply
Digilent 60W PCIe 12V 5A Power Supply
×1
Bilge Pump 12V 360GPH
×1
Linear Regulator (7805)
Linear Regulator (7805)
×1
Rocker Switch, Splash Proof
Rocker Switch, Splash Proof
×1
Terminal Block Interface, Terminal Block
Terminal Block Interface, Terminal Block
×1
Jumper wires (generic)
Jumper wires (generic)
×20
Toggle Switch, Metal Lever
Toggle Switch, Metal Lever
×1
StripBoard (Veroboard)
×1
Capacitor 470 µF
Capacitor 470 µF
×1
Capacitor 100 µF
Capacitor 100 µF
×2
DC Power Connector, Socket
DC Power Connector, Socket
×1
Heat Sink, Panel
Heat Sink, Panel
×1
Plastic Enclosure, Hand-Held Plastic Box Style 2
Plastic Enclosure, Hand-Held Plastic Box Style 2
×1
Flow Sensor, Pulsed Output
Flow Sensor, Pulsed Output
×1

Software apps and online services

Pycom Visual Studio Code (Pymakr)
Arduino IDE
Arduino IDE
ThingSpeak API
ThingSpeak API

Hand tools and fabrication machines

Drill / Driver, Cordless
Drill / Driver, Cordless
Track Cutter, Stripboard
Track Cutter, Stripboard
Soldering iron (generic)
Soldering iron (generic)
Solder Wire, Lead Free
Solder Wire, Lead Free
Solder Flux, Soldering
Solder Flux, Soldering
Multitool, Screwdriver
Multitool, Screwdriver

Story

Read more

Custom parts and enclosures

EnclosurePhoto2

Overall view of the prototype without pumps controller circuitry and power source from 9V rechargeable battery 800mAH

EnclosurePhoto1

External view of the prototype appearance

Prototype Appearance

Appearance Drawing (Not to Scale)

Schematics

Arduino Communication

This is a Diagram showing the communication between the Pycom and the Arduino Uno.

Power Supply Schematic

This is showing the Schematic Diagram of the power supply.

Water Flow Rate Sensor

This is a Diagram showing how the Water Flow rate sensor has been connected.

Code

Thinkspeak_MatLab_Code_FlowRate

MATLAB
This coding is used to recombine HighByte & LowByte to form decimal value in Thinkspeak visual display.
% Read flowrate_H and flowrate_L and total consumption from a public ThingSpeak channel created


% Channel ID to read data from 
readChID = 888517; 
   
% Obtain the channel ID and write API key for your channel 
% Replace [] with your channel ID 
writeChID = 890527; 
% Enter your Write API Key between the '' 
writeAPIKey = '1VNEDKGLY4QK417D'; 
   
% Read air temperature, time stamps, and wind speed from weather station 
[Flowrate_H] = thingSpeakRead(readChID,'Fields',1);
[Flowrate_L] = thingSpeakRead(readChID,'Fields',2);
[Total_Consumption_H] = thingSpeakRead(readChID,'Fields',3);
[Total_Consumption_L,time] = thingSpeakRead(readChID,'Fields',4); 
   
% Calculate and display flowrate data 
Flowrate = Flowrate_H + (Flowrate_L * 0.1); 
display(Flowrate,'FlowRate '); 

% Calculate and display total consumption data 
Total_Consumption = Total_Consumption_H + (Total_Consumption_L * 0.01); 
display(Total_Consumption,'Total_Consumption'); 

% Calculate billing
Total_Billing = (Total_Consumption *0.001) * 2.7
display(Total_Billing,'Total Billing (S$)'); 

% Plot flowrate and total_consumtion to your channel 
thingSpeakWrite(writeChID,[Flowrate,Total_Consumption,Total_Billing],'Fields',[1,2,3],... 
'TimeStamps',time,'WriteKey',writeAPIKey);

FlowMeterDIY_JLa_sigfox.ino

Arduino
Programming Code for Arduino
/*
Liquid flow rate sensor -DIYhacking.com Arvind Sanjeev

Measure the liquid/water flow rate using this code. 
Connect Vcc and Gnd of sensor to arduino, and the 
signal line to arduino digital pin 2.
 
 */
#include <SoftwareSerial.h>

SoftwareSerial nanoSend(3,4); //Rx,Tx

byte statusLed    = 13;

byte sensorInterrupt = 0;  // 0 = digital pin 2
byte sensorPin       = 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 frac;
unsigned int flowMilliLitres;
//unsigned long totalMilliLitres;
float totalMilliLitres;
unsigned long oldTime;
unsigned long oldTime1;

void setup()
{
  
  // Initialize a serial connection for reporting values to the host
  Serial.begin(9600);
  nanoSend.begin(9600); 
  // Set up the status LED line as an output
  pinMode(statusLed, OUTPUT);
  digitalWrite(statusLed, HIGH);  // We have an active-low LED attached
  
  pinMode(sensorPin, INPUT);
  digitalWrite(sensorPin, HIGH);

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

  // The Hall-effect sensor is connected to pin 2 which uses interrupt 0.
  // Configured to trigger on a FALLING state change (transition from HIGH
  // state to LOW state)
  attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}

/**
 * Main program loop
 */
void loop()
{
   
   if((millis() - oldTime) > 5000)    // 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.
    
    
    // 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)* 0.001;
      
  
    
    // 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("L"); 
 
 
    
    // 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);
    oldTime = millis();
  }

  if((millis() - oldTime1) > 120000)
  {
       byte flowrate_H = int(flowRate);    
    byte flowrate_L = frac;
    byte totalML_H = floor(totalMilliLitres);
    byte totalML_L = (totalMilliLitres - totalML_H) * 100;

    String dataMsg = "";

    dataMsg += flowrate_H;
    dataMsg += ",";
    dataMsg += flowrate_L;
    dataMsg += ",";
    dataMsg += totalML_H;
    dataMsg += ",";
    dataMsg += totalML_L;

    Serial.print("\n dataMsg : ");
    Serial.println(dataMsg);
    nanoSend.print(dataMsg);
    oldTime1 = millis();
  }
}

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

Credits

Tan Wei Kang

Tan Wei Kang

1 project • 0 followers
Student of ITE College Central Singapore
Khilfie Adly B Muhlan

Khilfie Adly B Muhlan

1 project • 0 followers
Soh Wei Kang

Soh Wei Kang

1 project • 0 followers

Comments