Let Them Brew Coffee

Automatically control your coffee maker by simply turning on a light switch, setting an alarm, or pushing a button on your mobile device.

BeginnerFull instructions provided2 hours971

Things used in this project

Hardware components

Particle Photon

included with the photon are all the necessary components for a photoresistor circuit

HS-311 servo

Cuisinart DCC 4 cup coffeemaker

Wood-cased #2 HB Pencils

Software apps and online services

IFTTT Maker service

ControlEverything.com Mobicle

Story

Problem

As two UNC Charlotte, mechanical engineering juniors Ty and I rely heavily on the aid of caffeine supplements in our diets. Our favorite way to ingest this mind sharpening drug is through the nectar of the Colombian Gods… COFFEE. However, tragedy strikes when we wake up 20 minutes before class, deprived of the proper time to turn on our coffee maker. Therefore, we as engineers, created from nothing a solution.

Solution

What’s one thing we all do in the morning? Turn the lights on. We took this and decided to use a particle photon to measure the analogue value from a photoresistor to sense when the lights are on. To increase the marketability of our product we added two other ways of initiating morning bliss, via an alarm and using our phone.

1 / 4 • Photon with photoresistor on

Determining Values

In order to decide what value to cause an initial publish we took ten values from the photoresistor with the lights on.

lights on table

We chose 200 as our starting value, because it was close to the average. Then we double checked when our device was running.

(excel) experimental lights on

This graph indicates we picked the correct initializing value, and we did not have an issue with the photoresistor's reading.

(our device is not always on, so continuous data collection is not useful)

Code

int led = D0; 

int photoresistor = A0; 

int power = A5; 

int analogvalue; 


void setup() {

    
    pinMode(led,OUTPUT);
    pinMode(photoresistor,INPUT);  
    pinMode(power,OUTPUT); 
   
    digitalWrite(power,HIGH);

    
    Particle.variable("analogvalue", &analogvalue, INT);
    

}




void loop() {

    
    analogvalue = analogRead(photoresistor);
    delay(100);
    if (analogvalue>=200)
        Particle.publish("800853132_lights_on", "coffee_time", 1001);
    

}

Servo myservo;  // create servo object to control a servo
                // a maximum of eight servo objects can be created
int led2 = D7;
int pos = 0;    // variable to store the servo position
int servo = D0;
void setup()
{
  myservo.attach(D0);  // attaches the servo on the D0 pin to the servo object
  // Only supported on pins that have PWM
  Particle.function("Coffee",servo1);
  pinMode(led2, OUTPUT);    
  Particle.subscribe("800853132_lights_on",loop, "270035001847343338333633");
}

void loop(const char *event, const char *data)
{
 
 
                                 
          myservo.write(pos = -1);              
          delay(2000);                       
        
              
          myservo.write(pos = 80);
          
          Particle.publish("800854853_Coffee_Is_Ready", "Brew_Started_Light/Alarm");
          delay(600000);
        
     Particle.publish("800854853_Coffee_Is_Ready", "Brew_Executed_Light/Alarm");
    
     
         
          
}     

int servo1(String command) {

    if (command=="on") {
        myservo.write(pos = -1);
        delay(2000);                       
        myservo.write(pos = 80);
        Particle.publish("800854853_Coffee_Is_Ready", "Brew_Started_Phone");
        return 1;
    }
    else if (command=="off") {
        myservo.write(pos = -1);              
        delay(2000);                       
        myservo.write(pos = 80);
        Particle.publish("800854853_Coffee_Is_Ready", "Coffee_Off_Phone");
        return 0;
    }
    else {
        return -1;
    }
    
    delay(600000);
        
     Particle.publish("800854853_Coffee_Is_Ready", "Brew_Executed_Phone");

}