Shift Conf '17 - How I hacked my coffee machine using JS

Shift Conf '17 - How I hacked my coffee machine using JS

A talk about how I hacked my coffee machine using JavaScript. A full blog post about this is at bit.ly/coffee-js

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Dominik Kundel

June 02, 2017
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  1. 1.

    ☕.js How I hacked my Coffee Machine Dominik Kundel |

    @dkundel | #shi2Split #coffeejs #htcpcp
  2. 2.

    HI! ! I'm Dominik! ! Dominik Kundel | @dkundel |

    #shi2Split #coffeejs #htcpcp
  3. 3.

    About me Developer Evangelist at Get in touch with me!

    ! @dkundel " dkundel@twilio.com # github/dkundel Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  4. 4.
  5. 9.
  6. 12.

    Why JS? 1. The last +me I wrote C++ was

    in university 2. I know JavaScript well which makes coding faster 3. Wri+ng a web server is easy 4. It's more challenging 5. Hardware === eventDriven && JS === eventDriven Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  7. 31.

    What We Knew • 8 cables/pins • 6 switches •

    7 LEDs Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  8. 32.

    Assump&ons 1. One cable is ⚡ 2. We need at

    least 3 pins + power controlling the " 3. We need at least 3 pins + power controlling the # 4. What is the 8th cable for? Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  9. 33.

    The Naive Approach const five = require('johnny-five'); const Tessel =

    require('tessel-io'); const board = new five.Board({ io: new Tessel() }); board.on('ready', () => { const p1 = new five.Pin({ pin: 'b0', mode: 2 }); //... const p8 = new five.Pin({ pin: 'b7', mode: 2 }); const pins = [p1, /* ... */, p8]; board.repl.inject({ pins: pins }); }); Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  10. 34.

    The Naive Approach II const five = require('johnny-five'); const Tessel

    = require('tessel-io'); const board = new five.Board({ io: new Tessel() }); board.on('ready', () => { const p2 = new five.Pin({ pin: 'b1' /*, mode: 2 */ }); //... const p8 = new five.Pin({ pin: 'b7'/*, mode: 2 */ }); const pins = [p2, /* ... */, p8]; board.repl.inject({ pins: pins }); }); Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  11. 35.

    Bu#ons? How About Bu#ons! board.on('ready', () => { // PIN

    declaration ... const b2 = new five.Button('b1'); const b3 = new five.Button('b2'); const b7 = new five.Button('b6'); const b8 = new five.Button('b7'); const buttons = [b2, b3, b7, b8]; buttons.forEach(btn => { btn.on('press', () => console.log('Pressed button no.%d', btn.pin)); btn.on('release', () => console.log('Released button no.%d', btn.pin)); }); }); Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  12. 39.

    We Are On To Something ! • Pin 1 is

    ⚡ (turns on LED4, LED5, LED7) • Pin 4-6 can turn off " LED4, " LED5, " LED7 • Pin 7-8 react on # • Pin 2 can manipulate # S3 && # S4 • Pin 3 can manipulate # S1 && # S2 Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  13. 40.
  14. 45.

    ! Progress! ! Pin 1-3 === ⚡ Pin 4-6 ===

    ! Pin 7-8 === !??? Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  15. 48.

    It All Makes Sense! ! S1 = P3 ➡ P7

    ! S2 = P3 ➡ P8 ! S3 = P2 ➡ P7 ! S4 = P2 ➡ P8 ! S5 = P1 ➡ P7 ! S6 = P1 ➡ P8 " LED7 (Power) = P1 ➡ P6 Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  16. 51.

    const espresso = new five.Relay({ pin: 'a4', type: 'NO' });

    const grande = new five.Relay({ pin: 'a5', type: 'NO' }); const power = new five.Relay({ pin: 'a6', type: 'NO' }); espresso.close(); grande.close(); power.close(); board.repl.inject({ espresso, grande, power }); Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  17. 55.

    418 - I'm a teapot Dominik Kundel | @dkundel |

    #shi2Split #coffeejs #htcpcp
  18. 58.

    Hyper Text Coffee Pot Control Protocol • Built on top

    of HTTP • Adds BREW method • Safe and Accept-Additions Headers • HTTP code 418 • coffee:// URI scheme • many more things Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  19. 65.

    ! Reverse-engineering is a lot of fun Dominik Kundel |

    @dkundel | #shi2Split #coffeejs #htcpcp
  20. 68.

    ! Tessel 2 is great! Dominik Kundel | @dkundel |

    #shi2Split #coffeejs #htcpcp
  21. 70.

    What's Next? ! • Programma(cally determine state • Add more

    relays • Sugges(ons??? Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp
  22. 73.

    Any Ques)ons? Get in touch with me! ! Dominik Kundel

    " @dkundel # dkundel@twilio.com $ github/dkundel Dominik Kundel | @dkundel | #shi2Split #coffeejs #htcpcp