The document discusses a project to build an automated coffee machine using a Tessel 2 microcontroller board, ambient light and relay sensors, and a Node.js client/server setup. It describes the hardware components used, including the coffee machine, microcontroller, sensors, and relays. It then covers setting up the software, creating a WebSocket server to control the relay and receive sensor data, and deploying everything using npm scripts and a Makefile. Finally, it encourages starting small with hardware projects and provides some resources for learning more.

1. cafè
terminal

2. Szabolcs
@_Nec

3. IBM Budapest Lab
formerly Ustream

4. JSConf Budapest
@jsconfbp

5. I’m going to talk about
hardware,
software,
deployment,
then do a demo,
finish with some lessons

10. Ingredients

11. Ingredients
Coffee machine
Microcontroller
Sensors
Relays
Cables
Water
Coffee beans

12. Coffee machine
Old Saeco espresso machine
single arm, 15 bar
no fancy smart controls
just a plain switch on/off
thermostat!

13. Microcontroller
Tessel 2 board
onboard WIFI / LAN
2 USB ports
2 module slots
runs pure JS!
The BRAIN

15. Microcontroller
You can use any other, similar controller like
Arduino or Raspberry.

16. Microcontroller
Ease the stress and anxiety of making
the step from software to hardware

17. Ambient Sensor
Ambient module,
detects changes in
sound
light
Emits an event if the light level raise above
a given value

18. Ambient Sensor
Check if we’re ready to brew
Not the best way, fuzzy data,
has to be calibrated,
far from accurate

19. Relay
Relay module
Software controlled electrical switch
Controls a switch for 230V / 10A
with 5 Volts on a digital signal

20. Relay
Relay module
Turn on coffee machine &
start to brew if ready

21. Cables & soldering
Not as hard as it seems
Check your nearby hobbyelectronic store

22. Cables & soldering

23. Cables & soldering

24. Cables & soldering

25. Cables & soldering

26. Water & coffee
Even harder to make coffee
without these

27. Pump switchPower switch
Thermostat LED
Hardware setup

28. Pump switchPower switch
Thermostat LED
SainSmart
2-channel Relay
Tessel 2
Tessel Ambient
sensor module

29. Software

30. Tessel 2
Runs pure JS / Rust
CLI tools
install from npm
hw module libs

31. Tessel 2 CLI
> t2 _
list
version
update
run
push

32. Node environment
node 4.5.0
use ES6 & Babel

33. Tessel2 hello world
// Import the interface to Tessel hardware
var tessel = require('tessel');
// Turn one of the LEDs on to start.
tessel.led[2].on();
// Blink!
setInterval(function () {
tessel.led[2].toggle();
tessel.led[3].toggle();
}, 100);

34. Connect to WIFI
AP mode
supports security
Wifi / Network

35. Network
WebSocket server
CoffeeMaker App
Relay Sensor

36. Relay
Sensor
Wrap & hide hardware API
mock behavior for desktop
using ENV variables
runs on desktop
easy to test
Network

37. Server (Tessel) Client
Ready for connection
Connect and tell
server to brew coffee
turn on machine
wait for warmup
brew coffee
tell client it’s done
Client exits
turn off machine

38. Deployment & run

39. "scripts": {
"deploy": "npm run cleanup && …
"local": "npm run cleanup && …
"device": "npm run cleanup && …
"cleanup": "rm -rf build; …
"t2:erase": "t2 erase",
"t2:push": "t2 push .",
"t2:run": "t2 run .",
"copy": "cp .tesselinclude …
"build": "npm run cleanup; …
"install:prod": "npm i —only…
},
use npm scripts
compose build
pipeline
run / deploy
Automate everything

40. #!/bin/bash
NODE=`which node` # find the node executable on this system
coffee: ;
${NODE} client/index.js # run the client script
.SILENT: coffee # no unnecesary makefile output
.PHONY: coffee
Makefile

41. $ make coffee
Makefile

42. DEMO
TIME

43. Can I have a
Volunteer please?

44. cafè
terminal

45. Finally

46. Getting started
with hardware is easier
than you might think
Don’t be afraid
Read the docs
Find communities

47. Don’t buy stuff
for a blinking LED
or a “hello world”
“Yet another expensive toy”

48. Start with solving a
simple problem
nearby
Actual problem solving
It drives you
It’s useful
or just pure fun

50. Start tinkering!
The mindset will
follow
Hackable stuff everywhere
Would it be better if…?
Could I…?

51. Links
https://tessel.io/
https://github.com/necccc/CafeTerminal

52. Huge thanks to all who helped me around
with Tessel & hardware
Ferenc Boldog - @fboldog
Tim Pietrusky - @TimPietrusky
Nick Hehr - @hipsterbrown

53. Thank you!