Cappuccino Connect

Tired of the monotony of a cup of Joe? This product spices up your morning routine with mobile control and a musical alarm!

BeginnerShowcase (no instructions)2 hours805

Things used in this project

Hardware components

Particle Photon

Particle Relay Shield

AC Adapter

Current Sensor

Buzzer

Resistor 221 ohm

Software apps and online services

ThingSpeak API

IFTTT Maker service

ControlEverything.com Mobicle

Hand tools and fabrication machines

Soldering iron (generic)

Story

Have you ever been bored with regular old coffee in the morning? Have you ever wanted to get out of bed and have a warm frothy cappuccino ready for you while enjoying the coolest tunes? This was the inspiration for this project. Our group is not a huge fan of coffee, and we wanted something different and fun to spruce up our morning routine.

This project utilizes IFTTT, ThingSpeak, the particle cloud, piezo buzzers, and relay shields.

The basic set up for the cappuccino maker is shown below.

Setup of the Sending Photon

Relay Setup for the Sending Photon (Note: The cappuccino maker's power cable is connected to the "NO" or "Normally Open" port and the "COMM" port.

Current Sensor connected between analog pins A0 and GND.

A resistor with a nominal value of 221 ohms was soldered onto the current sensor so that the photon doesn't experience a short. If the resistor is changed, the values for when a brew status is detected in the code will also have to be changed.

Current Sensor looped around the "hot" side of the cappuccino maker power cable (Note: Cable must be split. "Hot" side has smaller prong.)

Setup for the Receiving Photon. Piezo Buzzer connected between analog A4 and GND.

One photon is connected to the relay shield that was provided by Particle. The relay shield is just a way to send a signal directly to the cappuccino maker through the photon. The AC adapter was able to be split so that a current sensor could be attached. The photon would read the current that passes through and give a status - either brewing, or done. We found the current threshold and integrated that into the code. These results were published to the cloud for graphing purposes, and to the other photon.

The other particle was subscribed to the this event and was waiting for it. Once it received the brewing event, it turned on a light. The alarm goes off once the finished event is published. We were dissatisfied with a normal annoying alarm so we researched some code that allowed us to play some Mario music. There's a bunch of free code out there that allows different songs, but for the purposes of this tutorial, we chose the Mario theme. Also, we sent a notification to our phones when it is finished in case you can't hear the alarm from where you are. Below is a picture of the text received when your cappuccino is finished.

Text Notification for Cappuccino Connect

Below is a video showing how everything works together.

The current was graphed over time using ThingSpeak. The results of our graph are shown below.

ThingSpeak Graphs illustrating both the Current Sensor Value and the Brew Status

Code

// -----------------------------------------
// Cappuccino1 - Send Code
// -----------------------------------------
#define publish_delay 10000
unsigned int lastPublish = 0;
int led = D6; // This is where Relay 4 is listening - use the COMM/NO terminals.
int CT = A0; // This is where the Current Sensor, CT, is plugged in. 
int analogvalue; // Here we are declaring the integer variable analogvalue, which we will use later to store the value of the CT.
int coffeeBrew = 0; // tells us when asserted that there is current - the CT says we are brewing
#define OPEN 0
#define CLOSED 1
int relayState = OPEN ; // NO relay connected
int l = 0;
const String key = "4ACORE12KU9R59W4";
// Next we go into the setup function.
void setup() {
   // First, declare all of our pins. This lets our device know which ones will be used for outputting voltage, and which ones will read incoming voltage.
   pinMode(led,OUTPUT); // Our LED pin is output (Turning on Relay 4)
   pinMode(CT,INPUT);  // Our CT pin is input (reading the CT)
   
   // We are going to declare a Particle.variable() here so that we can access the value of the CT from the cloud.
   Particle.variable("analogvalue", &analogvalue, INT);
   Particle.variable("coffeeBrew", &coffeeBrew, INT);
    Particle.variable("loopCounter", &l, INT); 
    // This is saying that when we ask the cloud for "analogvalue", this will reference the variable analogvalue in this app, which is an integer variable.
   // We are also going to declare a Particle.function so that we can turn the LED on and off from the cloud.
   Particle.function("startCoffee",startCoffee);
   
}
#define AMPSCOUNT 300
void loop() {
     int i; 
   // total 1K samples from the ADC of the CT to see if there is much (10 counts) of current passing.  If we miss the on event, we will find it next pass
   analogvalue = 0;
   l++;
   
unsigned long now = millis();
    if ((now - lastPublish) < publish_delay) {
        return;
    }






    int value = analogRead(A0);

   Particle.publish("thingSpeakWrite_All", +
     "{ \"1\": \"" + String(value) + "\"," +
       "\"2\": \"" + String(coffeeBrew) + "\"," +
       "\"3\": \"" + String(l) + "\"," +
 //      "\"4\": \"" + String(bme280baro) + "\"," +
   //    "\"5\": \"" + String(bme280altitude) + "\"," +
    //   "\"6\": \"" + String(analog1) + "\"," +
    //   "\"7\": \"" + String(analog2) + "\"," +
     //  "\"8\": \"" + String(analog3) + "\"," +     
       "\"k\": \"" + key + "\" }", 60, PRIVATE);
    lastPublish = now;
      

   
 if(relayState==CLOSED) {  // only watch current if we have commanded the relay to close
   for (i=0; i<1024; i++) analogvalue += analogRead(CT);
   analogvalue /= 1024;  // experience shows a # > AMPSCOUNT means we are brewing
   if ((coffeeBrew == 1) && (analogvalue < AMPSCOUNT)) {  // just had an on to off event
       // assert web talk here. Will be a Particle.publish event, Other photon will be subscribed to this event, IFTT will see this event publish as well
       coffeeBrew = 0;
       digitalWrite(led,LOW);
      Particle.publish("cappuccino_status","ready"); //attempt at publishing
      delay(10000);
   }  
   else if ((analogvalue >= AMPSCOUNT)) { // still brewing
       coffeeBrew = 1;
       Particle.publish("cappuccino_status","brew");
   }
   delay(10000);
 } else { //relayState != CLOSED
  
        }
  delay(10000);
}
// Finally, we will write out our startCoffee function, which is referenced by the Particle.function() called "startCoffee"
int startCoffee(String command) {
   if (command=="on") {
       relayState = CLOSED;
       digitalWrite(led,HIGH);
       return 1;
   }
   else if (command=="off") {
        digitalWrite(led,LOW);
        return 0;
    }
    else {
        return -1;
    }

}

// -----------------------------------------
// Cappuccino-Mario - Receive Code
// -----------------------------------------
/*
  Arduino Mario Bros Tunes
  With Piezo Buzzer and PWM
  by: Dipto Pratyaksa
  last updated: 31/3/13
*/
//First we will set the frequencies for each musical note
/*************************************************
 * Public Constants
 *************************************************/

#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978


// We're going to start by declaring which pins everything is plugged into.
int speakerPin  = A4;
int boardLed = D7;
//Mario main theme melody
int melody[] = {
  NOTE_E7, NOTE_E7, 0, NOTE_E7,
  0, NOTE_C7, NOTE_E7, 0,
  NOTE_G7, 0, 0,  0,
  NOTE_G6, 0, 0, 0,
 
  NOTE_C7, 0, 0, NOTE_G6,
  0, 0, NOTE_E6, 0,
  0, NOTE_A6, 0, NOTE_B6,
  0, NOTE_AS6, NOTE_A6, 0,
 
  NOTE_G6, NOTE_E7, NOTE_G7,
  NOTE_A7, 0, NOTE_F7, NOTE_G7,
  0, NOTE_E7, 0, NOTE_C7,
  NOTE_D7, NOTE_B6, 0, 0,
 
  NOTE_C7, 0, 0, NOTE_G6,
  0, 0, NOTE_E6, 0,
  0, NOTE_A6, 0, NOTE_B6,
  0, NOTE_AS6, NOTE_A6, 0,
 
  NOTE_G6, NOTE_E7, NOTE_G7,
  NOTE_A7, 0, NOTE_F7, NOTE_G7,
  0, NOTE_E7, 0, NOTE_C7,
  NOTE_D7, NOTE_B6, 0, 0
};
//Mario main them tempo
int tempo[] = {
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
 
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
 
  9, 9, 9,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
 
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
 
  9, 9, 9,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
};


void setup() {
    pinMode(boardLed,OUTPUT);
  
  Particle.subscribe("cappuccino_status", MyHandler);
    

    
}

void MyHandler(const char *event, const char *data) {


    if (strcmp(data,"ready")==0)  {
        for (int thisNote = 0; thisNote < 79; thisNote++) {

          // to calculate the note duration, take one second
          // divided by the note type.
          //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
          int tempos = 1000/tempo[thisNote];
          tone(speakerPin, melody[thisNote],tempos);
    
          // to distinguish the notes, set a minimum time between them.
          // the note's duration + 30% seems to work well:
          int pauseBetweenNotes = tempos * 1.30;
           delay(pauseBetweenNotes);
          // stop the tone playing:
           noTone(speakerPin);
          digitalWrite(boardLed,LOW);
          }
        //return 1;
    }
     else if (strcmp(data,"brew")==0) {
    // if it is still brewing, turn your board LED on
    digitalWrite(boardLed,HIGH);
   }
  else {
    // if the data is something else, don't do anything.
    // Really the data shouldn't be anything but those two listed above.
  }
  
}