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@JoeKarlsson1
IoT
and
JS(?!)
A Gentle
Introduction to the
Internet of Things
@JoeKarlsson1
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{
name: “Joe Karlsson”,
company: “MongoDB”,
title: [
“Developer Advocate”,
“Software Engineer”
],
twitter: “@JoeKarlsson1”,
twitch: “joe_karlsson”,
website: “joekarlsson.com”,
}
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@JoeKarlsson1
Before we get started…
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@JoeKarlsson1
Thank you for coming!
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@JoeKarlsson1
MagicMirror^2
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Moodlite
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How is this going to work?
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A Quick Audience Poll
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IoT?
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JS?
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Agenda
• Intro to IoT
• IoT data cycle
• Why JS and IoT?
• IoT data best practices
• IoT Demo
• The future of IoT
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What
the
heck
is
IoT?
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A network of devices that
have an IP address and can
communicate with each other
over the internet
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It’s just the
internet, but
with “things”
on it
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…so what
is a
“thing?”
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Smart Home
Home Security
Smart Appliances
Smart Light Bulbs
Smart Outlets
Nest Thermostat
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Automated Manufacturing
Humidity Sensor
Motion Sensor
Remote Monitoring
Smart Delivery
Temperature Sensor
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Wearables
Smart Water Bottle
Fitbit
Breathing Sensor
Smart Running Shoes
Lumo Run Shorts
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IoT
Lifecycle
Collect
Communicate
Analyze
Act
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@JoeKarlsson1
A company is an association or collection
of individuals, whether natural persons,
legal persons, or a mixture of both.
Company members share a common
purpose and unite in order to focus their
various talents and organize their
collectively available skills or resources to
achieve specific, declared goals.
Collect
Devices and sensors collect data
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@JoeKarlsson1
A company is an association or collection
of individuals, whether natural persons,
legal persons, or a mixture of both.
Company members share a common
purpose and unite in order to focus their
various talents and organize their
collectively available skills or resources to
achieve specific, declared goals.
Communicate
Data and events sent through the network
Data Center
The Cloud Home Router
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@JoeKarlsson1
A company is an association or collection
of individuals, whether natural persons,
legal persons, or a mixture of both.
Company members share a common
purpose and unite in order to focus their
various talents and organize their
collectively available skills or resources to
achieve specific, declared goals.
Analyze
Computers analyzes the incoming data
Run Reports
Home Router
Machine Learning View Reports
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@JoeKarlsson1
A company is an association or collection
of individuals, whether natural persons,
legal persons, or a mixture of both.
Company members share a common
purpose and unite in order to focus their
various talents and organize their
collectively available skills or resources to
achieve specific, declared goals.
Act
Taking action based on the data
Send a notification
Communicate with
another machine Stream
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Why does IoT Matter?
Source: https://www.statista.com/statistics/471264/iot-number-of-connected-devices-worldwide/
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IoT
+
JS(?!)
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JS is a
great
choice
for new
devs
Other low level
programming
languages can be
difficult to develop
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Why Node?
58 percent of
respondents that
identified as
IoT developers use
Node
Source: https://nodejs.org/en/blog/announcements/nodejs-foundation-survey/
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Easy to
update
over a
network
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The
internet
already
speaks JS
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Tons of
existing
libraries,
plugins
and APIs
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Cylon.js Johnny-Five
https://cylonjs.com/ http://johnny-five.io/
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JS is great
at handling
event-driven
apps
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It got dark in here
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Can you turn yourself on?
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I turned myself on
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Events
reduce
the cost
of
listening
for the
device
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But what do
we do with
all that
data?
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I’m totally
biased,
but…
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MongoDB is a
great choice
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• Capable of high speed
data ingest
• An event driven DB
• Makes it easy to update
your schema
• Great at handling time
series data
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MongoDB is:
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Let’s jump
into
something
*practical
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OK, so it’s
still a WIP, but
let’s talk about
it
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Want to watch
me make it?
https://www.twitch.tv/joe_karlsson
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1 x Raspberry Pi 3 Model B
1 x Breadboard
1 x HX711 Module [Load cell amplifier]
What Materials Do We Need?
4 x 50 kg load cells [used to measure the weight]
1 x Magnetic door sensor
1 x Kitty Litter Box
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Raspberry Pi
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Small and
amazingly
capable,
credit card size
$35
computer
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Install Node on
your Pi
Find tips here:
https://www.losant.com/blog/how-to-install-nodejs-on-raspberry-pi
@JoeKarlsson1
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General Purpose
Input/Output
Pins [GPIO]
Can be used to interact
in with the real world
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Output Pins
Switches that the
Raspberry Pi can turn on
or off
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Input Pins
Switches that you can turn on
or off from the outside world
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Great Overview
of the GPIO Pins
on Wikipedia
@JoeKarlsson1
Source: https://en.wikipedia.org/wiki/Raspberry_Pi#General_purpose_input-output_(GPIO)_connector
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Breadboard
A breadboard is used
for prototyping
electronics
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Building
a circuit
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@JoeKarlsson1
Code: https://github.com/JoeKarlsson/iot-kitty-litter-box
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@JoeKarlsson1
The first step
of any IoT
project is to
make an LED
blink
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@JoeKarlsson1
var five = require("johnny-five");
var Raspi = require("raspi-io").RaspiIO;
var board = new five.Board({
io: new Raspi()
});
board.on("ready", function() {
var led = new five.Led("P1-13");
led.blink();
});
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Alright, let’s
make a toilet
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• When box is opened, go
into maintenance mode.
• When the box is closed,
recalibrate weight.
• When significant weight
is sensed, take weight
measurement of cat and
send data to MongoDB
Atlas.
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@JoeKarlsson1
const { RaspiIO } = require('raspi-io');
const five = require(‘johnny-five');
const board = new five.Board({
io: new RaspiIO(),
});
let state = {
isMaintenenceMode: false,
};
board.on('ready', () => {
const spdt = new five.Switch('GPIO16');
spdt.on('open', () => {
state.isMaintenenceMode = true;
});
spdt.on('close', () => {
state.isMaintenenceMode = false;
});
});
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@JoeKarlsson1
The load cells…
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Couldn’t find
support for my
load cells with
Johnny-Five, so
I had to get
creative.
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@JoeKarlsson1
import time
import sys
import RPi.GPIO as GPIO
from hx711 import HX711
while True:
try:
except (KeyboardInterrupt, SystemExit):
cleanAndExit()
hx = HX711(5, 6)
hx.set_reading_format("MSB", "MSB")
hx.set_reference_unit(1)
hx.reset()
hx.tare()
def cleanAndExit():
print("Cleaning...")
GPIO.cleanup()
print("Bye!")
sys.exit()
val = hx.get_weight(5)
print(val)
hx.power_down()
hx.power_up()
time.sleep(0.1)
loadCell.py
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@JoeKarlsson1
const spawn = require('child_process').spawn;
const process = spawn('python', ['./hx711py/scale.py'],
{ detached: true });
// Takes stdout data from script which executed
// with arguments and send this data to res object
process.stdout.on('data', data => {
let currWeight = parseFloat(data);
let avgWeight = updateAverageWeight(currWeight, recentsWeights);
});
process.stderr.on('data', err => {
console.error(err);
});
process.on('close', (code) => {
console.log(`child process exited with code ${code}`);
});
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process.stdout.on('data', data => {
let currWeight = parseFloat(data);
let avgWeight = updateAverageWeight(currWeight, recentsWeights);
});
const checkIfCatIsPresent = (avgWeight, baseBoxWeight) => {
if (avgWeight - bufferWeight > baseBoxWeight + config.cat.weight) {
return true;
}
return false;
};
const updateAverageWeight = (currWeight, recentsWeights) => {
if (currWeight) {
const maxArrLength = 20;
if (recentsWeights.length >= maxArrLength) {
recentsWeights.shift();
}
recentsWeights.push(currWeight);
return getAvg(recentsWeights);
}
};
const getAvg = arr => {
if (arr.length) {
const sum = arr.reduce(function(a, b) {
return a + b;
}, 0);
const avg = sum / arr.length;
return avg;
}
return arr[0];
};
const catPresent = checkIfCatIsPresent(avgWeight, baseBoxWeight);
if (catPresent) {
// Send data to MongoDB
}
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@JoeKarlsson1
Connecting to
the MongoDB
Atlas Cluster
@JoeKarlsson1
Want $200 in free credits? http://bit.ly/grizzhacks
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@JoeKarlsson1
Connect our IoT
app with the
Node MongoDB
Driver
@JoeKarlsson1
Want $200 in free credits? http://bit.ly/grizzhacks
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const MongoClient = require(‘mongodb').MongoClient;
const uri =
‘mongodb+srv://kay:[email protected]/iot
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect(err => {
const collection = client.db(‘IoT’).collection('toilets');
// perform actions on the collection object
client.close();
});
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@JoeKarlsson1
• Smooth out calibration
• Hook up Stitch functions
to send out weekly email
report
• Make web app that
visualizes my cats
bathroom habits/weight
with MongoDB Charts
@JoeKarlsson1
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@JoeKarlsson1
1 x Raspberry Pi 3 Model B
1 x Breadboard
1 x 68 Ohms Resistor
What Materials Do We Need?
1 x LED
2 x Female to Male Wires
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@JoeKarlsson1
Raspberry Pi
@JoeKarlsson1
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@JoeKarlsson1
Small and
amazingly
capable,
credit card size
$35
computer
@JoeKarlsson1
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@JoeKarlsson1
Install Node on
your Pi
Find tips here:
https://www.losant.com/blog/how-to-install-nodejs-on-raspberry-pi
@JoeKarlsson1
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@JoeKarlsson1
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@JoeKarlsson1
General Purpose
Input/Output
Pins [GPIO]
Can be used to interact
in with the real world
@JoeKarlsson1
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@JoeKarlsson1
@JoeKarlsson1
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@JoeKarlsson1
Output Pins
Switches that the
Raspberry Pi can turn on
or off
@JoeKarlsson1
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@JoeKarlsson1
Input Pins
Switches that you can turn on
or off from the outside world
@JoeKarlsson1
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@JoeKarlsson1
Great Overview
of the GPIO Pins
on Wikipedia
@JoeKarlsson1
Source: https://en.wikipedia.org/wiki/Raspberry_Pi#General_purpose_input-output_(GPIO)_connector
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@JoeKarlsson1
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@JoeKarlsson1
onoff
npm package for interacting
with GPIO
@JoeKarlsson1
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@JoeKarlsson1
Breadboard
A breadboard is used
for prototyping
electronics
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Code: https://github.com/JoeKarlsson/IoT-Morse-Code-Demo
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@JoeKarlsson1
LED Resistors
Resistors are
used to reduce
current, adjust
signal levels,
etc.
A diode that
emits light
when a voltage
is applied to
it.
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Building
a circuit
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@JoeKarlsson1
Code: https://github.com/JoeKarlsson/IoT-Morse-Code-Demo
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IoT Morse Code
Machine
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@JoeKarlsson1
Smaller and
more
powerful
devices
\
Better
Hardware
support
JS with a
smaller
footprint
Batteries will
become the
bottleneck
The Future of JS + IoT?
@JoeKarlsson1
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@JoeKarlsson1
Do you
want to
be an
IoT and
JS
master?
@JoeKarlsson1
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Just do it!
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@JoeKarlsson1
IoT is exploding
Raspberry Pi’s use GPIO to interact with the real world
JS is a great choice for IoT
Easy to update apps
Internet already speaks JS
Great supporting libraries
JS excels at event-driven apps
Start with a small project and jump in and learn as you go!
MongoDB is a great choice for IoT projects
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@JoeKarlsson1
Questions?
@JoeKarlsson1
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@JoeKarlsson1
Thank
You!
@JoeKarlsson1
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{
name: “Joe Karlsson”,
company: “MongoDB”,
title: [
“Developer Advocate”,
“Software Engineer”
],
twitter: “@JoeKarlsson1”,
twitch: “joe_karlsson”,
website: “joekarlsson.com”,
}
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MongoDB Community
• MongoDB University:
• university.mongodb.com
• MongoDB Community Slack Channel:
• https://launchpass.com/mongo-db
@JoeKarlsson1
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@JoeKarlsson1
•$200 in free Atlas credits: http://bit.ly/nyccodecamp2019
•Code - https://github.com/JoeKarlsson/IoT-Morse-
Code-Demo
• IoT Reference Architecture - https://
www.mongodb.com/collateral/iot-reference-architecture
•Time Series Data and MongoDB: Best Practices Guide -
https://www.mongodb.com/collateral/time-series-best-
practices
•A language for the Internet: Why JavaScript and Node.js
is right for Internet Applications - Tom Hughes-Croucher
Additional Resources
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@JoeKarlsson1