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SHA2017 - Coffee Machines && JavaScript - Intro to Nodebots

SHA2017 - Coffee Machines && JavaScript - Intro to Nodebots

These are the slides for a workshop given at SHA 2017

Dominik Kundel

August 06, 2017
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  1. About me Developer Evangelist at Get in touch with me!

    ! @dkundel " [email protected] # github/dkundel Dominik Kundel | @dkundel | #sha2017 #coffeejs
  2. 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 | #sha2017 #coffeejs
  3. What We Knew • 8 cables/pins • 6 switches •

    7 LEDs Dominik Kundel | @dkundel | #sha2017 #coffeejs
  4. 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 | #sha2017 #coffeejs
  5. 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 | #sha2017 #coffeejs
  6. 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 | #sha2017 #coffeejs
  7. 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 | #sha2017 #coffeejs
  8. 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 | #sha2017 #coffeejs
  9. ! Progress! ! Pin 1-3 === ⚡ Pin 4-6 ===

    ! Pin 7-8 === !??? Dominik Kundel | @dkundel | #sha2017 #coffeejs
  10. 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 | #sha2017 #coffeejs
  11. 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 | #sha2017 #coffeejs
  12. 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 | #sha2017 #coffeejs
  13. What's Next? ! • Programma(cally determine state • Add more

    relays • Sugges(ons??? Dominik Kundel | @dkundel | #sha2017 #coffeejs
  14. Any Ques)ons? Get in touch with me! ! Dominik Kundel

    " @dkundel # [email protected] $ github/dkundel Dominik Kundel | @dkundel | #sha2017 #coffeejs