MEGR 3171 Automated Sink Sensing

Take control of washing your hands with this faucet sensing system!

BeginnerFull instructions provided8 hours270

Things used in this project

Hardware components

Particle Argon

Ultrasonic Sensor - HC-SR04 (Generic)

Jumper wires (generic)

Elegoo KY-028 Digital Temperature Sensor

FL-408 Water Flow Sensor

Software apps and online services

Particle Build Web IDE

ThingSpeak API

Hand tools and fabrication machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Plier, Waterpump

Story

Inspired by the recent pandemic, our project focuses on helping the user wash their hands effectively by sensing temperature and water use. An ultrasonic sensor detects motion and triggers a temperature and water flow sensor to track live data. On ThingSpeak.com, live feeds of the temperature and water flow are graphically displayed while you wash your hands.

Video Demonstration

Ultrasonic Sensor

The ultrasonic sensor detects motion activity in front of the sink. Once triggered, it will send a signal to the particle cloud. Once motion is detected, the Particle cloud will communicate with the other two Argons connected. One argon has a water flow sensor, while the other has a temperature sensor. Once the ultrasonic sensor is triggered, it will communicate with the other sensors to publish live data to ThingSpeak.

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Digital Temperature Sensor

The temperature sensor will be positioned near the outlet of the sink faucet. It’s purpose is to give feedback on the temperature of the water. As water exits the faucet, the sensor measures the temperature and publishes it to the Particle cloud. The data is sent and displayed to a live feed on ThingSpeak. The user can adjust the faucet to find that perfect temperature. No more cold hands.

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Water Flow Sensor

The water flow sensor is connected to the waterline of the sink to track both instantaneous water flow rate and total water volume. Once the water starts moving, a hall effect sensor within the device housing reads a signal from the water flow. Sensor frequency is then converted to liters per minute (LPM), and total cumulative water usage (Volume) is calculated. This data is sent to the cloud and is published to a live feed on ThingSpeak. The user can use this to monitor the amount of water used while washing their hands. (Jet ski)

FL-408 Water Flow Sensor

Project Configuration

1 / 2 • Project Configuration

Live ThingSpeak Data

https://thingspeak.com/channels/1362442

1 / 3 • Live Feed Water Flow Rate

Code

#define HCSR04_PIN_TRIG D4
#define HCSR04_PIN_ECHO D5


int sound = 0;
long timeTaken;
long distance;
int onboardLed = 7;

void setup() {
    
    Serial.begin(9600);
    pinMode(onboardLed, OUTPUT);
    pinMode(HCSR04_PIN_TRIG, OUTPUT);
    pinMode(HCSR04_PIN_ECHO, INPUT);
    Particle.subscribe("temp", temp, MY_DEVICES);       //Subscribe to temperature sensor
}



void loop() {
    
    digitalWrite(HCSR04_PIN_TRIG, LOW);
    delayMicroseconds(2);
    digitalWrite(HCSR04_PIN_TRIG,HIGH);
    delayMicroseconds(10);
    digitalWrite(HCSR04_PIN_TRIG,LOW);
    timeTaken = pulseIn(HCSR04_PIN_ECHO,HIGH);
    distance = (timeTaken/2)/29.1;




if (distance <= 20) {                                   
    
    Particle.publish("Water Flow", "On", PUBLIC);
}

else {
    
    Particle.publish("Water Flow", "Off", PUBLIC);
    
    }
}


void temp(const char *event, const char *data) {
    
    
    digitalWrite(onboardLed, HIGH);
    delay(1000);
    digitalWrite(onboardLed, LOW);
}

#include <ThingSpeak.h>

int analogvalue = 0;
double temp = 0;

void setup() {
    
    Serial.begin(9600);
    pinMode(D7, OUTPUT);
    pinMode(A0, INPUT);
    
    digitalWrite(D7, HIGH);
    delay(500);
    digitalWrite(D7,LOW);
    Particle.subscribe("Water Flow", WaterFlow, MY_DEVICES);            // Subscribe to motion sensor
   
    Particle.variable("analogvalue", analogvalue);
    Particle.variable("temp",temp);
  
}


void loop() { 
    
    delay(1000);
    analogvalue = analogRead(A0);
    temp = (analogvalue *- .08099688473520249 + 151.99688473520249);    // Convert analog value to degrees Fahrenheit
    delay(2000);

}

void WaterFlow(const char *event, const char *data) {
    
    
    if (strcmp(data, "On") == 0) {
        
        digitalWrite (D7, HIGH);
        Particle.publish("temp", String(temp), PRIVATE);                 // Publish temperature data to ThingSpeak when motion sensor is activated
    }
    
    else if (strcmp(data, "Off") == 0) {
        
        digitalWrite(D7 , LOW);
    }
        
    else {
        
    }
}

#include <ThingSpeak.h>

volatile int flowFreq; 
float vol = 0.0;
float LPM;
unsigned char flowsensor = 2;
unsigned long currentTime;
unsigned long loopTime;

void flow () {
    
   flowFreq++;
}

void setup() {
    
    
    pinMode(flowsensor, INPUT);
    pinMode(D7, OUTPUT);
    
    Serial.begin(9600);
    digitalWrite(flowsensor, HIGH);
    attachInterrupt(flowsensor, flow, RISING);
    Particle.subscribe("Water Flow", WaterFlow, MY_DEVICES);    // Subscribe to motion sensor
    
    currentTime = millis();
    loopTime = currentTime;
}


void loop () {
    
   currentTime = millis();
   if(currentTime >= (loopTime + 1000))
   {
    loopTime = currentTime;
    if(flowFreq != 0){
      LPM = (flowFreq / 7.5);                                   // Calculate water flow in liters per minute
      Particle.publish("flow", String(LPM), PUBLIC);            // Publish instantaneous flow rate to ThingSpeak
      LPM = LPM/60;
      vol = vol + LPM;                                          // Calculate total volume 
      Particle.publish("vol", String(vol), PUBLIC);             // Publish cumulative volume data to ThingSpeak
      flowFreq = 0;
    }
  }
}


void WaterFlow(const char *event, const char *data) {
    
    
    if (strcmp(data, "On") == 0) {
        
        digitalWrite (D7, HIGH);
    }
    
    else if (strcmp(data, "Off") == 0) {
        
        digitalWrite(D7 , LOW);
    }
        
    else {
        
    }
}