Welcome

International Nodebots Day

Houston, 2017

nodebots.io

Alan Lee

Donovan Buck

Michelle Wigington

Pierce Primm

Ryan Gill

Sponsors

MRI Dev Team

2016

Agenda

johnny-five.io

Important Points
To Consider

The only dumb question is the one you never asked.

Doesn't work?
It's probably the hardware.

Overview

• Tessel 2
• T2 CLI
• Tessel Experiments
• Build a NodeBot

Follow Along

Let's learn about your

NBD Houston

Starter Kit!

Tessel 2

Breadboard: Solderless wiring

Breadboard: Electrical Connections

Resistors: Reduce Current Flow, lower Voltage Level

LEDs: Light Up Your Life

Buttons, Potentiometer

Jumper Wires!

Pro tips!

• Start charging your USB battery
• Be mindful of your 9-volt(s). You'll want a fresh battery come race time

Getting started with the Tessel

Check your node.js version

node -v

6.11.1 is the latest, but any LTS Version should work

Argon - 4.2.0 - 4.8.4
Boron - 6.9.0 - 6.11.1

Install Tessel CLI

npm install -g t2-cli

Note: If you get the common npm EACCES error, correct it by fixing npm permissions and run the command again.

https://docs.npmjs.com/getting-started/fixing-npm-permissions

Connect The Tessel to your computer via USB

Find your Tessel

t2 list

Name your Tessel

t2 rename mario

Authorize

t2 provision

Create working directory

mkdir t2_fun && cd t2_fun

Initialize project

t2 init

Ready To Make Stuff?

Create Output

npm install johnny-five tessel-io

Make a new file

Mac users:

touch led-on.js

Windows users:

type nul > led-on.js

Connect positive lead (long) to pin A0 and the negative lead (short) to ground.

Turn LED on

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});

board.on("ready", function() {
  var led = new five.Led("A0");
  led.on();
});

t2 run led-on.js

http://johnny-five.io/api/board
http://johnny-five.io/api/led

Make LED blink

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});

board.on("ready", function() {
  var led = new five.Led("A0");
  led.blink();
});

t2 run led-blink.js

Change the blink rate.

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});

board.on("ready", function() {
  var led = new five.Led("A0");
  led.blink(2500); // <-- ms on/off phases
});

t2 run led-blink-slow.js

Create Digital Input

0|1

Respond to Button Press

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});

board.on("ready", function() {
  var button = new five.Button("A2");

  button.on("press", function() { console.log("Button Pressed!")});
  button.on("release", function() { console.log("Button Released!")});
});

t2 run button.js

http://johnny-five.io/api/button

Let's try Push

Instead of the run command, we will use the push command which copies the file on to the tessel and will now run this file at boot on every startup.

Convert Input to Output

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});

board.on("ready", function() {
  var led = new five.Led("A5");
  var button = new five.Button("A2");

  button.on("press", function() { led.on() });
  button.on("release", function() { led.off() });
});

t2 push button-led.js

Multiple States of Input to Multiple States of Output

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});

board.on("ready", function() {
  var led = new five.Led("A5");
  var button = new five.Button("A2");

  button.on("press", function() { led.on() });
  button.on("hold", function() { led.blink(50) });
  button.on("release", function() { led.stop().off() });
});

t2 push button-states.js

Observe Analog Input

Tessel 2 analog in pins:

• A4, A7
• B0 - B7

Variable Input

Receive Values From a Sensor

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});

board.on("ready", function() {
  var rotary = new five.Sensor("A7");

  rotary.on("change", function() {
    console.log("Sensor changed!", this.value);
  });
});

t2 run sensor.js

http://johnny-five.io/api/sensor

PWM

Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means.
Digital control is used to create a square wave, a signal switched between on and off.
- Arduino.cc

Control the brightness

var five = require("johnny-five");
var Tessel = require("tessel-io");
var board = new five.Board({
  io: new Tessel()
});

board.on("ready", function() {
  var sensor = new five.Sensor({
    pin: "a7",
    threshold: 2
  });
  var led = new five.Led("b5");

  sensor.on("change", () => {
    led.brightness(sensor.scaleTo(0, 255));
  });
});

t2 run brightness.js

Let's get untethered

t2 push brightness.js

Unplug the Tessel from your computer and plug it into the USB battery. Wait for the lights on the Ethernet port.

Let's Build A Robot

Peewee Bot Build Video

Break

Wiring

High Level Hardware

High Level App

johnny-five.io