Created March 23, 2018

Coffee Button

This is a button that triggers a coffee machine to turn on, and will flash an LED, and send temperature readings when the coffee is done.

IntermediateWork in progress3 hours32

Things used in this project

Hardware components

Jumper wires (generic)

Particle Photon

SparkFun Pushbutton switch 12mm

LED (generic)

Resistor 10k ohm

1N4007 – High Voltage, High Current Rated Diode

General Purpose Transistor NPN

9V Battery Clip

9V battery (generic)

Coffee Machine

Software apps and online services

Particle Pi

Hand tools and fabrication machines

Drill

Screwdriver

Soldering iron (generic)

Tape

Story

Overview

Too lazy to get out of bed to turn on the coffee machine? This project connects the coffee machine to a portable button, which can access the coffee machine from anywhere it can connect to WIFI.

Functionality

This project uses 2 Photons which communicate by a subscribe/publish function. the momentary push button is connected to one photon, and that turns on an LED. This sends a signal to the other photon via WIFI, which cuts the power to the transistor. The the disconnected transistor allows current to flow from the 9 volt battery to the start button, which turns on the coffee machine. The photon connected to the coffee pot then sends a signal back to Thingspeak, which graphs if it is on or not. A temperature sensor can also be attached to send temperature readings to Thingspeak, and is shown in the circuit diagrams.

Assembly

Step 1:

Get a Coffee Maker, and disassemble it to get access to the start button. When you have access to the start button, test to see if it can be powered by the 9 volt battery by touching the battery leads to each of the connections of the button to see if it will turn on. If it will not turn on, then you should reference another coffee machine hack that uses a relay, rather than a transistor.

Step 2:

You will then have to assemble the button breadboard, which is pictured below, and has a circuit diagram below as well. The LED is not necessary, but is shown.

Step 3:

Connect leads to the start button of the coffee maker. Then assemble the second breadboard with the other photon. The picture and circuit diagram are below.

Step 4:

(optional)

Drill a hole in order to place the temperature sensor near the heat source.

Step 5:

Program each photon with the provided code, and connect the photons to the internet.

Step 6:

Mount the breadboard to the coffee maker.

Graph of data acquired from photon live updated. Reports a 0 while device is connected to wifi and ready to start, when started the graph will report a value of 1. After the process is over the graph will report 0 again.

Code

// We will be using D1 to control our LED
int ledPin = D1;
// Our button wired to D0
int buttonPin = D0;
//Particle.publish(int start);
//Particle.subscribe();

void setup()
{
    pinMode(buttonPin ,INPUT_PULLUP); // sets pin as input
    pinMode(ledPin ,OUTPUT ); // sets pin as output
}

void loop()
{
    int buttonState = digitalRead(buttonPin);


    if( buttonState == LOW )
    {
    // turn the LED On
    digitalWrite(ledPin, HIGH);
    Particle.publish("startcoffee");
    }
    else
    {
    // otherwise
    // turn the LED Off
    digitalWrite(ledPin, LOW);
    //start = 0;
    }
}

int led1 = D7;

void setup() 
{
    pinMode(led1, OUTPUT);
    Particle.subscribe("startcoffee", startCoffee ,"540046000751353530373132");
}

void startCoffee(const char *event, const char *data)
{
    
    
    // To blink the LED, first we'll turn it on...
    digitalWrite(led1, HIGH);
    Particle.publish("started");
    // We'll leave it on for 1 second...
    delay(1500);

    // Then we'll turn it off...
    digitalWrite(led1, LOW);


    // Wait 1 second...
    delay(1500);
    

} 

void loop() 
{
    
}

Credits

Eric Bryan and Patrick Whitley

1 project • 0 followers

Group design project for Mechanical Engineering

Coffee Button

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Push Button Photon

Coffee Machine Circuit Diagram

Code

Controller Particle Photon

Machine Starter Code

Credits

Eric Bryan and Patrick Whitley

Comments

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Coffee Button

Coffee Button

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Push Button Photon

Coffee Machine Circuit Diagram

Code

Controller Particle Photon

Machine Starter Code

Credits

Eric Bryan and Patrick Whitley

Comments