Taha SiddiqiAaron SmithBecca
Published © GPL3+

Smart Laundry Detergent Dispenser

Dispense detergent using a smart home device such as Google Home or Amazon Alexa.

IntermediateShowcase (no instructions)3 hours140

Things used in this project

Hardware components

Argon
Particle Argon
×3
Solderless Breadboard Half Size
Solderless Breadboard Half Size
×3
Mini Pushbutton Switches
×3
SparkFun Load Cell Amplifier - HX711
SparkFun Load Cell Amplifier - HX711
×1
Load Cell Combinator
×1
Magnetic Door Switch
×1
Bathroom Scale from Walmart (or a set of four 3 wire load cells)
×1
IRLB8721 N Channel Mofest
×1
12V 6.7A DC power supply (I used one from a phillips respironics machine)
×1
12V Push/Pull Solenoid
×1
Assorted Jumper wires
×1

Software apps and online services

Particle Build Web IDE
Particle Build Web IDE
Maker service
IFTTT Maker service

Hand tools and fabrication machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires
Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires
Creality Ender 3

Story

Read more

Custom parts and enclosures

Bracket

Schematics

System Wiring (Level sensor not included)

Level Sensor Schematic

Code

System Control Code

C/C++
This is the code for the entire system combined to be ran on a single Particle Argon.
// This #include statement was automatically added by the Particle IDE.
#include <HX711ADC.h>

// This #include statement was automatically added by the Particle IDE.
#include <HX711ADC.h>

#include "HX711ADC.h"

#define calibration_factor 10000

//#define DOUT  3
//#define CLK  2

SYSTEM_THREAD(ENABLED);

float weight1;
float weight2;
float weight3;
float weightAvg;
bool shouldGetWeight = false;
double percent;
int smallSwitchState = 0;
int mediumSwitchState = 0;
int largeSwitchState = 0;
int LASTsmallSwitchState = 0;
int LASTmediumSwitchState = 0;
int LASTlargeSwitchState = 0;
int switchstate = 0;
int lastswitchstate = 0;
bool doorOpen = false;
bool haveOrdered = false;
int groundpin = D0;
int smallSwitch = D1;
int mediumSwitch = D2;
int largeSwitch = D3;
int solenoid = D4;
int switchpin = D5;
int groundpinDoor = D6;
int DOUT = D9;
int CLK = D8;

const pin_t led = D7;


//SCALE CODE
int weightFunc(const char *topic, const char *data) {
    shouldGetWeight = true;
    
 return 0;
}

//SOLENOID CONTROL
int ledToggleSmall(String command) {
    
        digitalWrite(solenoid, HIGH);
        
        delay(3000);
        
        digitalWrite(solenoid, LOW);
        
        delay(1000);
        
        Particle.publish("get-weight", PRIVATE);
 
 return 0;   
}

int ledToggleMedium(String command) {
 
        digitalWrite(solenoid, HIGH);
        
        delay(5000);
        
        digitalWrite(solenoid, LOW);
        
        delay(1000);
        
        Particle.publish("get-weight", PRIVATE);

 
 return 0;   
}

int ledToggleLarge(String command) {
   
        digitalWrite(solenoid, HIGH);
        
        delay(7000);
        
        digitalWrite(solenoid, LOW);
        
        delay(1000);
        
        Particle.publish("get-weight", PRIVATE);
 
 return 0;   
}


HX711ADC scale;


void setup() {
    
    //DOOR SWITCH CODE
    pinMode(switchpin, INPUT_PULLUP);
    
    pinMode(groundpinDoor, OUTPUT);
    
    digitalWrite(groundpinDoor, LOW);
    
    //SOLENOID CONTROL CODE
    pinMode(smallSwitch, INPUT_PULLUP);

    pinMode(mediumSwitch, INPUT_PULLUP);

    pinMode(largeSwitch, INPUT_PULLUP);

    pinMode(groundpin, OUTPUT);

    pinMode(solenoid, OUTPUT);

    Particle.function("ledSmall", ledToggleSmall);

    Particle.function("ledMedium", ledToggleMedium);

    Particle.function("ledLarge", ledToggleLarge);
    
    //SCALE CODE
    Serial.begin(9600);
    
    Serial.println("HX711 scale demo");
    
    scale.begin(DOUT, CLK);
    
    scale.set_scale(calibration_factor);
    
    scale.tare();
    
    Particle.subscribe("get-weight", weightFunc, MY_DEVICES);
    
    //ORDER CHECK
    

}

void loop() {
    
    //DOOR SWITCH CODE
    lastswitchstate = switchstate;  //copy the previous switch state to the last switch state
    switchstate = digitalRead(D5);  //read a new switch state.
    
    //SOLENOID CONTROL
    LASTsmallSwitchState = smallSwitchState;
    LASTmediumSwitchState = mediumSwitchState;
    LASTlargeSwitchState = largeSwitchState;

    smallSwitchState = digitalRead(D1);
    mediumSwitchState = digitalRead(D2);
    largeSwitchState = digitalRead(D3);
    

    if (switchstate == 1) {
        if (smallSwitchState == 0 && LASTsmallSwitchState == 1){
            ledToggleSmall("ledSmall");
            delay(1000);
        }
    
        else if (mediumSwitchState == 0 && LASTmediumSwitchState == 1){
            ledToggleMedium("ledMedium");
            delay(1000);
        }
    
        else if (largeSwitchState == 0 && LASTlargeSwitchState == 1){
            ledToggleLarge("ledLarge");
            delay(1000);
        }
        
        switchstate = 0;
    }
    
    //SCALE CODE
    if (shouldGetWeight == true) {
      weight1  = scale.get_units();
      delay(1000);
      weight2  = scale.get_units();
      delay(1000);
      weight3  = scale.get_units();
      weightAvg = (weight1 + weight2 + weight3) / 3;
      percent = (weightAvg / 9) * 100;
      Particle.publish("weight-avg", String(weightAvg));
      Particle.publish("percent-remaining", String(percent));
      delay(2000);
      shouldGetWeight = false;
    }
    
    //CHECK TO ORDER
    if (percent <= 25.0 && haveOrdered == false){
        Particle.publish("order-detergent", PRIVATE);
        haveOrdered = true;
    }
    
    else if (percent >= 85.0){
        haveOrdered = false;
    }

}

Scale Calibration

C/C++
Use this code to calibrate the scale. The value it produces should be entered on line 9 of the system control code.
// This #include statement was automatically added by the Particle IDE.
#include <HX711ADC.h>

/*
 Example using the SparkFun HX711 breakout board with a scale
 By: Nathan Seidle
 SparkFun Electronics
 Date: November 19th, 2014
 License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license).

 This is the calibration sketch. Use it to determine the calibration_factor that the main example uses. It also
 outputs the zero_factor useful for projects that have a permanent mass on the scale in between power cycles.

 Setup your scale and start the sketch WITHOUT a weight on the scale
 Once readings are displayed place the weight on the scale
 Press +/- or a/z to adjust the calibration_factor until the output readings match the known weight
 Use this calibration_factor on the example sketch

 This example assumes pounds (lbs). If you prefer kilograms, change the Serial.print(" lbs"); line to kg. The
 calibration factor will be significantly different but it will be linearly related to lbs (1 lbs = 0.453592 kg).

 Your calibration factor may be very positive or very negative. It all depends on the setup of your scale system
 and the direction the sensors deflect from zero state
 This example code uses bogde's excellent library: https://github.com/bogde/HX711
 bogde's library is released under a GNU GENERAL PUBLIC LICENSE
 Arduino pin 2 -> HX711 CLK
 3 -> DOUT
 5V -> VCC
 GND -> GND

 Most any pin on the Arduino Uno will be compatible with DOUT/CLK.

 The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine.

*/

#include "HX711ADC.h"

#define DOUT  3
#define CLK  2

HX711ADC scale;

float calibration_factor = 10000; //-7050 worked for my 440lb max scale setup

void setup() {
  Serial.begin(9600);
  Serial.println("HX711 calibration sketch");
  Serial.println("Remove all weight from scale");
  Serial.println("After readings begin, place known weight on scale");
  Serial.println("Press + or a to increase calibration factor");
  Serial.println("Press - or z to decrease calibration factor");

  scale.begin(DOUT, CLK);
  scale.set_scale();
  scale.tare(); //Reset the scale to 0

  long zero_factor = scale.read_average(); //Get a baseline reading
  Serial.print("Zero factor: "); //This can be used to remove the need to tare the scale. Useful in permanent scale projects.
  Serial.println(zero_factor);
}

void loop() {

  scale.set_scale(calibration_factor); //Adjust to this calibration factor

  Serial.print("Reading: ");
  Serial.print(scale.get_units(), 1);
  Serial.print(" lbs"); //Change this to kg and re-adjust the calibration factor if you follow SI units like a sane person
  Serial.print(" calibration_factor: ");
  Serial.print(calibration_factor);
  Serial.println();

  if(Serial.available())
  {
    char temp = Serial.read();
    if(temp == '+' || temp == 'a')
      calibration_factor += 10;
    else if(temp == '-' || temp == 'z')
      calibration_factor -= 10;
  }
}

Credits

Taha Siddiqi

Taha Siddiqi

1 project • 3 followers
Aaron Smith

Aaron Smith

1 project • 2 followers
Becca

Becca

0 projects • 0 followers

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