►
Description
Bringing JavaScript to the IoT Edge - Joe Karlsson, Mongo
The number of IoT devices is expected to be around 18 billion by 2022 and be a market of over $500 Billion. Edge computing is becoming an even bigger requirement. As a versatile language, JavaScript is in a great position to power many of these devices. This session will explore why and where JavaScript is being used in this industry segment and specifically the role that Node.JS plays in the Internet of Things.
Data collection in the IoT arena comes in fast and from a variety of sensors and devices. How to model that data is important for analysis downstream. We’ll also take a look at some different schema design patterns to think about when storing the data in a modern database, like MongoDB.
A
Okay,
I'm
just
gonna
get
started
here.
People
are
gonna,
be
wandering
in
that's
totally
okay,
but
this
is
bringing
JavaScript's
the
IOT
edge.
Let's
get
started
first
of
all,
I
just
want
to
kind
of
whet
your
palate
a
little
bit.
I
get
y'all
excited
about
the
topic.
So
why
does
this
matter?
Why
are
we
learning
about
IOT?
Why
are
you
here?
You've
probably
seen
this
graph
before,
but
IOT
is
growing
and
will
continue
to
grow.
I
do
want
to
put
a
little
asterisk
here.
A
I
think
that
IOT
has
probably
been
a
little
hyped
and
I,
don't
think
it's
gonna,
be
it's
like
we're,
not
seeing
the
growth
quite
that
way,
but
I
think
that
IOT
is
still
massive
and
I
think
it's
still
we're
still
in
the
Wild
West
days,
trying
to
figure
out
what
what
the
hell
it
is
we're
early.
This
is
early
we're
early
in
on
that
too,
and
javascript
is
a
massive
part
of
the
IOT
ecosystem.
So
the
more
you
know
great,
so
my
name
is
Joe
Carlson
I
work
for
MongoDB
and
I'm
a
developer
advocate.
A
A
Opinions
are
my
own
if
I
say
something
or
swear
something.
It's
not
my
company.
It's
me
and
lastly,
I'm
gonna
be
posting.
This
link
a
lot,
but
all
the
resources
I
post
in
here,
including
the
slides
all
the
other
links,
additional
resources
links
or
this
recorded
session,
went
to
the
code
link
to
videos
all
be
on
that
page,
so
feel
free
to
check
that
out.
I'm.
A
A
Cool
I
will
be
posting
slinky,
or
at
least
this
QR
code
again
so
a
little
bit
more
about
me,
I
love,
IOT
and
most
of
my
projects
that
I
do
in
my
own
are
hardware
related
in
some
some
way
this
is
a
magic
mirror.
I
put
together.
Smart
mirror,
you
can
see,
does
whether
my
currently
playing
at
Spotify
some
positive
affirmations
and
york
times
headlines,
calendar
updates,
whether
whatever
it's
actually
I
didn't
make
it
it's
part
of
a
magic
mirror,
mirror
squared
project.
You
can
find
more
about
that
down.
There
you
choose
it.
A
Electron
I
did
make
this
recently.
It's
called
mood
light.
Those
are
3d
printed
panels
and
LEDs
in
the
corner
and
I
have
a
little
web
app
or
a
little
web
server
built
into
the
little
triangles.
Anyone
your
heard
of
Nana
Leafs
before
they're,
big
they're
super
expensive,
you've,
probably
seen
if
you
ever
googled
it
I
decided
I
want
to
pay
$300
for
nine
of
them,
so
I
just
made
my
own,
but
you
can
control
the
lights
from
that
web
server
running
from
those
panels,
and
you
can
learn
more
about
that
down
there.
Ok!
A
So
before
we
get
started
and
get
into
the
nuts
and
bolts
for
this,
I
want
to
first
just
thank
you
all
for
coming.
I
sincerely
appreciate
it.
I
don't
know,
I
have
a
cool
job
where
I
get
to
make
cool
and
travel
around
and
talk
to
people,
and
it's
because
of
you
guys
come
in
these
talks.
So
I
just
really
appreciate
it.
You
know
I
think
thank
you
for
being
here
and
who's.
This
talk
force.
A
This
is
gonna,
be
for
people
who
are
new
to
JavaScript
or
new
to
have
some
JavaScript
experience,
maybe
be
new
to
IOT.
This
is
more
of
a
kind
of
101
introductory
stuff
we're
not
going
to
be
getting
into
nitty-gritty
about
security.
We
have
30
minutes,
so
we're
gonna
kind
of
book
it
through
here.
But,
most
importantly,
even
if
you're,
like
IOT
expert
great,
like
or
none
of
the
above,
you
know,
do
JavaScript
you're
still
be
fine.
This
talk
is
still
for
you.
A
I'm,
hoping
you'll
still
get
something
new
out
of
it
too,
but
great
I
want
to
get
a
quick
poll
and
just
get
a
quick
pulse
on
where
y'all
are
at
so
who
here
has
IOT
experience
like
done
a
little
bit,
maybe
mess
around
raspberry
pi
before
cool
cocoa
cool
like
quarter,
half
ish
and
then
JavaScript
experience
assume
everyone
in
the
room,
great
okay,
cool
cool
and
again
here's
that
linked
where
all
the
resources
can
be
found
too.
So
I
think
everyone's
want
to
get
it.
Yeah
I'll
hold
this
up
one
more
time:
I.
A
A
What's
the
stock
in
OLAP
like
today,
I'm
gonna
do
a
quick
introduction
IOT
what
it
is,
what
I
love
about
it,
we're
talking
about
JavaScript
and
node
and
IOT,
and
why
you
should
be
considering
using
them
for
your
next
IT
project,
I'm,
going
to
talk
about
some
data
practices,
I'm
in
MongoDB
developer
advocates,
so
it's
kind
of
I'm
gonna
be
okay.
I!
Think
I
have
to
talk
about
data
a
little
bit
with
it
so
which
is
cool
actually
and
I.
Didn't
know
a
lot
about
this
too.
A
So
I
hope
you
learn
a
little
bit
there
too,
and
then
I
want
to
talk
about
a
real
project,
so
I've
been
working
on
it
I
it's
a
smart
kitty,
litter
box
in
my
free
time,
I've
actually
been
stringing
on
twitch,
so
we
going
over
that
project
in
particular,
and
then
lastly,
we're
talking
about
my
predictions
for
where
IOT
something
going
in
the
future
right.
So
what
the
heck
is
a
OT,
it's
basically
anything
that
has
that
connects
up
to
Internet
and
by
thing
I
mean
anything.
It's
the
future.
A
We're
seeing
that
stuff
like
right,
smartwatches,
fitbit's,
I,
think
the
part
that
people
don't
consider
with
with
IOT
is
like
automation,
especially
with,
like
fact,
manufacturing
smart
plants
connected
devices,
but
I
think
we
see
the
consumer
products
quite
often
and
think
about
those
being
IOT
projects.
My
personal
personally
I'm
interested
in
two
parts
of
IOT
I
love
the
stupid.
A
Have
you
ever
anyone
see
the
Twitter
account
Internet
of
where
people
make
like
like
toaster
ovens
that
connect
to
the
oven
or
or
like
toilets
like
I'm
putting
together
here
I
think
we
don't
know
exactly
what
it's
capable
of
yet.
So
we're
just
putting
chips
in
everything
and
kind
of
figuring
out.
What's
someone
doesn't
I
can
love
that
actually
I
ran
a
hackathon
in
Hawaii
called
the
stupid
and
terrible
ideas.
A
Hackathon
I
was
inspired
by
another
hackathon
I
got
started
in
New
York
City,
I,
love,
I,
love
that
fine
line
between
just
a
stupid
idea
and
a
kind
of
a
genius
idea,
I
think
that's
worth.
I
love,
I,
just
I
love
that
I
think
that's
great
and
I
think
there's
a
lot
of
room
there
for
us
to
kind
of
play
around
in
IOT.
The
other
part
I
really
like
is
art.
A
Whenever
I
travel,
the
cities
I
always
try
to
go
to
Newark
Museum
I
personally
think
that
the
people
in
this
room,
you
are
we're
uniquely
positioned
to
explore
this
new
area
of
art.
I.
Think
a
lot
of
humanities
and
artists.
Don't
know
a
lot
of
programming,
but
I.
Think
that,
like
that's,
where
we're
at
like
there's
a
lot,
there's
a
lot
of
exploration
that
can
be
done.
There
I
think
with
the
internet
connected
art,
I,
just
I
love
that
I
love,
where
we're
going
with
that
so
IOT.
A
So
IOT
is
anything
you
put
a
chip
in
it
and
IOT
is
exploding
and
I
love,
art
and
stupid,
with
Internet
programming
chips
in
it.
So
great,
okay,
that
was
a
fast
version.
I
had
to
kind
of
give
I
had
to
trim
this
up
because
I'm
have
30
minutes
so
worth
we're
going
to
doing
the
fast
version
here
today,
but
okay,
so
I
think
this
is
the
part
that
were
that
you'll
care
about
it's.
Why
should
you
be
using
javascript
and
IOT
with
your
next
IOT
project?
A
A
Personally,
this
is
an
opinion
but
I
think
JavaScript's,
a
great
language
for
new
debt
new
developers.
So
if
you're
new
to
programming
right
I
think
it's
a
great
choice
as
opposed
to
like
C
or
C++,
which
are
that,
like
there
are
advantages
that
memory-wise
space-wise
performance,
wise
but
low
level
languages
I
think
can
be
difficult.
You
learn
I
personally
I
program
in
C
and
C++
and
I
prefer
JavaScript
every
time.
A
A
You
know
other
thing
that
why
javascript
is
really
popular
is
it's
super
easy
to
update,
so
you
can
just
have
a
command
that
goes
out
to
all
of
your
sensors
on
the
field
and
tell
to
do
a
git
pull
and
NPM
install
and
boom
you're
updated
with
like
C
or
C++.
Traditionally
you
have
to
reflash
those
chips
with
the
new
hardware
or
with
the
new
software.
Excuse
me
that
can
be
expensive
and
time-consuming
and
challenging
to
do
over
a
network
remotely
and
tell
the
internet
really
speaks
javascript
we're
already
communicating
on
the
net.
A
Why
can't
we
communicate
with
IOT
projects
also
with
javascript
there's
a
ton
of
libraries?
Actually,
it's
been
around
I've
been
actually
developing
an
IOT
and
javascript
for
years
now
and
there's
it's
pretty
mature,
it's
a
pretty
mature
platform.
The
two
big
ones
right
now
are
Cylons.
Jas
may
know
that
from
Battlestar
Galactica
or
johnny-five
from
the
nineteen
eighty-something
movie
short
circuit
I'll
be
going
over
I
built
my
Liberty,
but
litter
box
using
johnny-five,
we'll
be
going
over
code.
Samples
with
that
today.
A
Okay
and
also
note
in
JavaScript
it
speaks
events.
It's
event-driven.
We
use
callbacks
to
kind
of
handle
callbacks
of
promises,
the
handle
events
right.
We
have
some
sort
of
event
trigger
some
callback
to
handle
it.
That's
basically
how
I
you
t-works
we're
waiting
for
something
to
happen,
and
we
want
to
do
something
so,
for
example,
maybe
I
have
a
moisture
sensor
and
it's
waiting
for
the
like
a
water
event
to
happen
on
that
sensor,
and
we
want
to
do
something
with
that.
A
We
want
to
analyze
it
and
send
it
off
to
our
centralized
server
cool
or
we
have
a
light
sensor.
That's
waiting
for
it
to
get
dark.
We
want
to
trigger
some
sort
of
callback
function
to
happen
when
that
event
gets
triggered.
Javascript
speaks
that
lane
the
language
of
physical
hardware.
Already
it's
it's,
it
works,
it
works
just
fine,
it's
that's
how
we're
building
it
anyways,
it's
native
and
if
that's
helpful,
because
it
helps
reduce
the
cost
of
listening.
It
makes
it
more
power
efficient.
A
Instead
of
having
to
do
work
all
the
time
we
just
do
work
when
Advent
gets
triggered
all
right.
So
recap:
why
should
you
be
considering
JavaScript
and
node
for
u
n--
x,
io
t
project
58
of
58%
of
IOT
developers
already
self-identified
as
no
developers?
It's
super
easy
for
new
developers
learn
C
and
C++
great
for
a
lot
of
reasons.
There
are
reasons
why
you
would
want
to
use
those
for
a
project,
but
I
would
argue.
Javascript
is
a
great.
It
works
in
it's
great
anyway.
So
super
easy
update
over
network.
A
A
A
What's
going
on
I'm
trying
to
bet
find
a
balance
there
between
like
making
it
like
less
abstract,
but
not
have
everyone
plays
out,
so
we
do
do
a
little
bit
of
actual
code,
we're
not
going
to
be
doing
a
deep
dive.
Anything.
Today,
though,
we
have
30
minutes
again
we're
gonna
kind
of
go
into
it,
though,
if
you
do
want
to
go
into
it.
Deeper
I
will
be
available.
A
After
the
talk
on
Twitter
or
like
I
said,
all
the
code
will
be
on
my
thing:
I
will
be
posting
all
the
stuff
to
my
Twitter
as
well.
So
great
you're,
great,
it's
already
mentioned
I'm
a
I'm,
a
mom
good
to
be
employee.
So
the
question
I
always
have
to
ask
is
how
do
we
deal
with
this
data?
I
want
to
come
at
this
from
an
angle
of
what
you
should
be
considering
if
you're,
if
you're
choosing
a
database
to
store
IOT
data.
A
So
first
thing
you
should
be
considering
is
a
database
needs
to
ingest
data
quickly.
So
imagine,
I'm
running
a
I
have
a
moisture
sensor
farm
out
at
my
farm
right,
I
have
a
bunch
of
little
sensors
out
measuring
the
moisture
of
my
crops.
Maybe
have
a
thousands
of
them
and
all
thousand
those
data
over
those
IOT
sensors
are
transmitting
data
back
to
my
centralized
database.
All
at
the
same
time,
I
need
a
database.
A
That's
gonna
be
able
to
handle
massive
concurrent
data,
which
we
see
a
lot
with
IOT
projects,
especially
as
you
start
scaling
up
right
at
home.
Hobby
project,
like
my
IOT
kitty,
litter
box
great
can
handle
one
just
fine,
but
what
happens
if
I
start
monetizing
this
and
manufacturing
it
deploying
you
know
millions
these
out
in
the
fields
like
you
need
a
database.
That's
gonna
be
able
to
handle
a
constant
stream
of
data,
just
a
massive
amount
of
concurrent
data
coming
in
all
the
time.
So
Duffy
consider
that
you
want
a
database
that
is
event-driven.
A
A
Flexible
schema
is
also
something
I
would
strongly
consider
as
well.
So
a
super
common
example
of
IOT
projects
is
upgrading
or
adding
additional
sensors.
So,
for
example,
recently
will
be
getting
this
a
little
bit.
I
added
a
switch
sensor
on
the
door
of
my
litter
box
to
tell
when
I
was
going
into
maintenance
mode
or
when
I
was
opening
it
to
clean
it.
A
It
was
super
easy
for
me
to
add
that
additional
sensor
data
to
my
my
database
I
didn't
have
to
do
anything
at
to
change
any
little
data
accidentally
character
like
great
just
like
after
you
know,
March
3rd
I'm,
just
gonna
start
tracking.
All
of
my
additional
new
sensor
data,
not
a
problem,
not
a
problem.
Super
easy
so
definitely
consider
if
you
like,
IOT
projects
are
more
flexible
to
schema
than
other
other
types
of
projects
and,
lastly,
time
series
data.
A
So,
there's
lots
of
there's
lots
of
ways
to
save
your
data
with
IOT
project,
but
time
series
data
is
probably
the
best
way
and
that's
because
a
lot
of
times
when
you're,
if
you're,
reading
or
you're
saving
data
to
it,
IOT
database
you're,
probably
doing
some
sort
of
reporting
on
it.
That's
traditionally
what
you
do
make
some
sort
of
admin
dashboard
showing
the
data
over
times
at
some
sort
of
time
period
and
yeah
I
may
be
biased,
but
MongoDB
is
a
a
choice
for
this.
A
It
does,
although
some
way
more
I'm
gonna
be
going
into
a
little
bit
just
briefly
how
to
do
how
I
I
implemented
time
series
data
with
my
kitty
litter
box
today
right
so
IOT
data
best
practices.
What
should
you
be
considering
if
you
are
considering
saving
data
for
IT
project?
You
need
a
database
that
handles
massive
concurrent,
read
rights.
You
want
a
database,
that's
a
bench
ribbon!
You
want
a
database
that
can
handle
flexible,
schema
oops,
and
you
want
a
database
that
can
handle
time
steers
what
ido
well
or
natively
right
all
right
easy.
A
So
I
eighty
data
best
practices
awesome.
This
is
my
favorite
part.
I
OT
kitty
litter
box,
so
let's
jump
into
some
practical
code,
so
I
built
a
iot
kitty,
litter
box
and
that's
my
cat
jumping
on
the
box
in
the
very
end
of
that
thing,
but
I
sprang
for
a
mid-century,
modern
kitty,
litter
box.
I
am
aware
that
says
extra.
You
can
buy
a
just
$20
thing
on
Amazon,
just
a
little
clothes
covered
thing
on
it,
no
problem,
but
he
worth
it.
So
it's
a
little
extra
for
it.
A
One
of
them
note
I,
want
to
say
about
this.
To
this
project
is
actually
still
work-in-progress.
I
have
the
MVP
done
I'm
still
actively
working
on
this
project.
If
you
do
want
to
watch
me
continue
to
work
on
this
project,
you
could
totally
check
it
out.
I'm
streaming,
this
weekly
on
the
DB
twitch
channel
find
a
link
to
it
there
and
some
videos
of
me
working
on
actually
on
our
YouTube
channel
right
now.
If
you
want
to
check
that
out,
I
love
this.
A
A
This
is
my
cat
eating
my
prototype,
slash,
helping
out
I,
don't
think
II
Denny
/
manage
and
he
didn't
get
electrocuted,
which
is
great
right.
I
I
have
a
3d
printer,
I
print
out
some
stuff
3d
printers
and
that
required
for
this,
but
I
would
recommend
getting
a
Raspberry
Pi.
You
can
work
with
a
bunch
of
other
stuff.
Johnny-Five
works
with
a
bunch
of
different
IOT
horde
work.
Lingered.
We
knows
whatever
I
use
a
Raspberry
Pi.
It's
super
easy
great.
You
can
run
a
full
node,
runtime
environment
on
there.
A
Okay,
so
I
think
it's
helpful
to
talk
about
how
we
can
actually
use
the
PI
and
JavaScript
to
to
interact
with
the
real
world
and
that's
through
the
GPIO.
The
general
purpose
input
output
board,
and
this
is
actually
how
we're
doing
it
for
me-
and
this
was
the
hardest
part
for
me
to
grok
when
I
was
first
starting
IOT
projects
like
okay,
great
I,
get
programming,
I
get
servers,
I
get
the
front
end,
but
how
do
I
start
interacting
with
the
real
world
and
it's
through
these
pins?
So
you
can
see
here.
A
This
is
a
little
prototype
hooked
up
to
a
breadboard,
with
data
flowing
in
and
out
of
the
GPIO
and
on
the
on
the
PI
there
you
can
see
on
the
top
row
with
those
little
black
and
white
wires
connected
up.
That's
where
the
GPIO
pins
on
there
I
think
there's
like
35
of
them,
but
the
GPIO
there's
two
types
of
pins:
well,
there's
two
types
and
power
pins:
the
first
is
output,
so
these
are
things
that
your
PI
you
can
like
send
out
to
the
world
to
go.
A
Do
things
on
it
like
turning
a
switch
on
and
off
or
an
LED
on
and
off
you
go
out
to
do
things.
The
other
one
is
inputs.
Reading
in
sensor,
data
from
the
outside
world,
for
example,
sensor
data
or
light
sensors
or
weight
data,
or
whatever
you're
just
waiting
for
the
data
to
come
in
reading
that
in
I
have
no
idea
what
all
these
pins
do,
their
unmarked
on
the
PI
and
most
and
most
most
ships
in
general.
A
Every
time
I
have
to
interact
that
I
have
to
Google
what
they
are
and
I
say
that
just
to
make
it
okay
for
you
to
have
to
Google
stuff
I,
don't
I'm
still
learning
the
stuff
I
memorize
it
I
have
to
Google
all
the
whole
time.
I
don't
know,
but
when
you're
in
it
working
with
it,
just
google,
it
people
tell
you
like
they
do.
This
pin
do
whatever
or
they
give
you
some
sort
of
schema
diagram.
You
can
like
kind
of
copy,
just
plug
it
in
okay,
cool.
So,
let's
jump
into
the
real
code.
A
Great,
let's
jump
with
some
real
code.
I
want
to
start
from
the
I
want
to
kind
of
take
you
through
the
journey
of
how
I
put
this
box
together
from
the
beginning
to
end.
So
the
first
thing
I
always
do
with
an
IOT
project,
is
actually
just
getting
that
dang
led
to
blank.
That's
the
hello
world
of
IOT
projects,
and
you
can
see
here.
This
is
my
demo.
It
basically
means
I've
initialized
that
sensor
correctly
and
I'm,
interacting
with
the
hardware
in
the
GPIO
correctly.
Alright,
just
like
with
traditional
development.
A
A
So
we
need
to
bring
in
the
package
for
raspberry
PI's,
because
that's
what
working
with
we
initialize
that
board
until
it
hey
the
johnny-five
working
with
a
Raspberry
Pi
today
cool
get
that
started,
and
then
we
have
a
callback
function.
That
is
ready.
So
when
that
board
has
been
initialized
and
saying
great,
we
run
that
up.
A
We
just
tell
it,
which
pin
so
we're
saying
on
the
GPIO
the
13th
pin,
which
I
had
to
go
to
Wikipedia
for
to
find
out
which
pin
that
actually
was,
and
then
we
has
a
function
just
called
blank,
and
that's
it.
It's
super
nice,
I'd,
love,
johnny-five,
said
super
expressive,
it's
just.
They
have
a
bunch
of
different
sensors
and
it
knows
how
to
work
with
them.
So
I
just
have
to
invoke
the
function
than
one
of
you,
but
get
the
hello
flight.
A
That's
only
a
couple
lines
of
code
to
get
that
led
to
blank
and
I
can
move
that
around
I
had
to
be
honest,
I
had
to
look
up
the
circuit
diagram
for
how
to
hook
up
an
LED
johnny-five
of
a
bunch
of
stuff
on
that
I
took
one
electrical
engineering
class
at
college:
I,
don't
remember
any
of
it
and
I
remember
any
of
it.
I
know
this.
Like
things
those
resistors
I
have
to
Google
it
every
time.
A
I'm,
just
like
I
want
to
lower
the
barrier
of
entry
and
say
you
don't
be
an
expert
to
do
this
stuff.
You
can
figure
it
out.
Ok
right!
So
we
got
our
hello
world
working
whoo,
let's
make
a
toilet.
I
have
a
variation.
Let's
talk
where
it's
a
IOT
but
Internet
of
toilets,
so
we're
gonna
we're
getting
we're
getting
into
the
IOT
projects
here.
Ok,
so
how
does
this
work?
I
want
to
go
high
level
over
how
this
like
how
this
works?
A
We
got
over
kitty
litter
box
here
too,
and
what
happens
is
I
have
a
switch
on
it.
So
when
I
take
the
top
off
my
box,
it
goes
into
maintenance
mode,
maintenance
mode
means
I'm,
either
removing
clumps
from
the
box
or
I'm.
Adding
more
sand
to
it
point
is,
though,
the
maintenance
mode
tells
it
allows
me
to
figure
out
when
I
need
to
recalibrate
the
base
weight
of
the
box.
A
So
but
the
point
is,
I
can
track
things
like
my
cats,
bathroom
habits
and
his
weight
over
time
see
plenty
drastic
changes
with
it.
I
haven't
done
this
yet,
but
I
would
love
to
do
like
some
machine
learning
models,
so
they
predict
my
cat's
bathroom
habits.
I
want
to
go
like
just
way
too
far
down
this
rabbit
hole
of
Internet
toilet
data,
we'll
see
what
happens.
I
haven't
done
it
yet,
okay,
great!
A
So
that's
how
like
how
the
box
is
working
from
a
high
level,
let's
dig
into
actually
I'm
building
the
code
up
so
we're
doing
the
same
thing.
We
did
before
we're
initializing
a
brand
new
johnny-five
Raspberry
Pi
board,
and
then
we
wait
for
that
ready
event
and
then
the
first
thing
I'm
going
to
do
then
is
set
up
the
maintenance
mode
and
lalala.
Oh,
we
have
a
switch,
so
it's
a
magnetic
switch
I,
have
on
the
door
and
just
senses
when
it's
open
or
closed,
depending
on
how
close
that
switches
together
and
when
it's
open.
A
We
have
some
sort
of
event
that
chap
ins
and
I
set
the
maintance
mode
and
once
mating
it
moans
happen.
I
do
that
recalibration
and
whatever
I
need
to
do
so.
This
is
a
little
demo.
It's
a
little
hard
to
see.
Let's
see
if
we
can
figure
this
out,
I
may
need
to
record
a
new
video,
but
you
can
see
the
switch
on
the
side
there
and
I'll
just
got
cut
off
there.
You
can
see
it.
The
sensor
is
sensing
the
open
and
closed
events
for
when
that
door
gets
open
to
her.
A
It's
goes
into
maintenance
mode
or
not
again
the
switch
doesn't
matter.
You
could
get
most
cheap
ones,
just
put
it
on
the
side
there.
So
you
pop
that
top
off.
You
need
some.
We
need
some
way
to
track
that,
whether
it's
a
minutes,
long
I
thought
about
other
things
too,
like
a
physical
switch.
If
you
kept
like
an
open
box,
there's
a
ton
of
things
you
can
do
for
that
does
really
matter,
but
okay,
so
switch
the
codes
really
easy
for
that's
not
too
bad.
A
The
interesting
part
is
the
load
cells,
so
I'm
using
I
made
my
own
internet-connected
scale.
That
goes
underneath
the
box
and
that's
what's
measuring
the
weight
and
waiting
for
cat
sized
things
to
enter
the
box.
So
here's
the
tricky
part
I
couldn't
actually
find
any
support
for
these
load
cells
that
I
purchased
with
johnny-five,
so
I
had
to
get
a
little
creative,
but
I
still
got
to
do
some
cool
stuff
with
node
that
you
may
or
may
have
played
with
I
hadn't.
But
let
me
show
you
so
I.
A
Actually
I
did
find
a
library
in
Python
which
was
able
to
interact
the
load
cells.
This
is
the
code
I
want
you
to
it's
like
doing
some
stuff
doesn't
matter
the
while
loop
is
where
the
interesting
stuff
happens.
So
it's
just
constantly
it's
a
never-ending
while
loop,
that's
just
getting
away
from
the
box.
A
The
important
part
here
is
that
prints
amen
so
I'm,
actually
using
odhh
spawn
child
process
to
spin
up
a
Python
process
and
read
that
data
for
me,
which
I
had
never
done
before,
because
the
first
time
I
did
this
I
set
up
my
own
Python
server
and
then
ahead,
sucked
up
WebSockets,
there's
just
real-time
stream-
that
data
to
my
node
service
but
was
like
a
pain.
The
ass
and
like
I
just
start
both
these
services
and
if
one
of
them
went
down
the
whole
thing
crashed.
A
It
was
just
a
massive
pain
to
maintain
and,
like
frankly,
overkill
child
process
made.
This
super
super
super
easy
to
run,
so
the
print
statement
is
actually
how
I'm
sending
data
up
to
the
child
process.
So
this
is
the
node
code
for
our
running
that
I'm
just
requiring,
and
that's
that
child
spawn
child
process
code
and
then
I'm
Rick
the
process
I'm
bringing
it
is
that
Python
code
and
then
detach
means
it
runs
on
a
separate
thread.
So
I
have
one
I.
A
Just
do
NPM
start
an
NPM
start
and
note
is
responsible
for
starting
up
all
my
node
services
and
then
it's
just
waiting
for
data.
So
we're
saying
on
data
read
it
in
and
the
way
you
send.
Data
from
that
spawned
child
process
is
through
that
print
statement.
You
just
print
out
the
console
and
the
parent
process.
A
My
node
process
reads
in
anything:
you're
printing,
the
console
so
I'm
just
doing
that
for
loop,
every
staff,
a
second
I'm
just
sending
that
data
up
to
my
parent
child
or
my
parent
yard
process,
and
then
it
reads
it
in
with
that
callback
function
and
then
I
parse
it
in
comes
in
a
string
and
then
I
breed
it
and
then
do
some
do
some
sort
of
work
with
it.
And
then
you
also
have
data
and
error
and
a
closed
event
to
you
can
also
work
with
you.
But
isn't
it
worked
with
child
spawn
child
process?
A
This
was
like
the
mysterious
part
about
node
I
had
like
not
worked
with
yet
I've
worked
the
streams,
those
other
stuff
but
I'd
never
didn't
spawn
child
process.
That's
actually
pretty
jazz
I
got
to
play
around
it's
a
little
bit
too.
So
he
came
to
an
IOT
talking,
maybe
learned
a
little
something
about
spawning
some
child
processes
too,
but
it
made
my
project
so
much
more
easier
to
put
together
so
much
easier.
Troubleshoot,
I,
love
it.
Okay,
so
I
want
to
give
a
quick
demo
of
how
this
actually
works.
A
So
you
can
see
a
little
bit
little
piece
of
plywood
there.
That's
actually
my
scale
I
just
bought
a
piece
of
plywood.
The
load
sensors
are
loaded
to
the
bottom
of
it.
I
have
that
little
caption
there,
like
kind
of
messy,
can't
see
really
anything
but
I'm
pressing
on
the
board,
and
you
can
see
that
that
data
being
registered
from
my
node
project
and
could
see
the
little
magnetic
switch,
also
hooked
up
on
the
door
over
there,
but
the
routing
zeroes
press
con
I
really
need
to
record
a
new
video
here.
A
You
see
nothing
great
cool,
so
this
part
was
the
trickiest
part,
but
I
think
it's
great
I
do
some
math
and
some
things
on
there.
It's
kind
of
zeroed
out
recalibrate
whatever,
but
doesn't
matter
what
it
is
I
just
kind
of
whatever
it
that
I
just
set
a
base.
Wait
and
I
wait
for
some
sort
of
weight
increase
to
happen.
A
Okay,
well,
I
do
want
to
talk
to
you
about
so
I
promised
I'd
show
you
my
time
series
data
and
how
I'm
actually
saving
the
state
of
the
database
I'm
gonna
post
a
link
here
on
the
bottom.
If
anyone
wants
200
free
credits,
200
hours
and
free
credits
to
MongoDB
Atlas,
there's
a
link
there
to
up
a
link
at
the
end
and
there's
a
link
on
that.
That
page,
there
too,
but
I'm
saving
all
my
data
in
a
MongoDB
database,
and
this
is
actually
what
my
time
series
data
looks
like
for
my
kitty.
A
Litter
box,
so
I
have
some
basic
metadata
about
my
box.
What
it
is
I
built
some
additional
metadata
in
there
too
I
don't
know
in
the
event.
I
start
mass
manufacturing
these
with
my
Kickstarter
I.
Don't
think
I
will
but
like
it
just
to
save
some
data
right
so
know
who
it
is
or
if
I
get
more
cats
or
whatever
I
can
potentially
save
that
data,
and
then
I
have
an
array
of
events
and
the
events
are
just
denoted
by
time
stamp
and
a
weight
and
also
I'm
tracking
things
like
maintenance
mode.
A
That's
when
a
door
gets
opened
so
like,
for
example,
I'm
out
of
toner
now
I
have
a
row
for
watching
my
cat
I
can
track
how
many
times
that
box
gets
open
one
on
the
road
by
noting
that
the
maintenance
mode
time
series
data
down
there
too,
and
it's
super
easy
to
add
or
update
things
in
there,
but
every
time
an
event
gets
triggered.
I'm
just
appending
a
thing
on
here.
One
note,
I
will
say
about
time
series
data.
The
way
I
would
recommend
constructing.
A
It
is
based
on
how
you
want
to
do
reporting
so
sometimes
you're
getting
sensor
data
every
half
a
second,
so
I
want
to
get
on
record
moisture
data
sensor
data
from
a
field
of
every
seconds
from
a
thousand
sensors
that
may
be
a
little
crazy
I'm
doing
mine
by
day,
cuz
I'm
doing
reporting
like
base
Sunday,
how
many
times
the
bathroom
is
it
getting?
Is
he
going
in
a
day
or
how
many
times
I
get
clean
the
day,
but
maybe
a
few
have
massive
data.
A
You
want
to
do
it
by
minute,
so
the
event
is
every
minute
you're,
creating
a
brand
new
document
and
keeping
track
of
their
idea,
or
maybe
a
year,
maybe
you're
only
sporadically
keeping
track
of
it
right.
I.
Think
with
like
of
a
document
database
like
this,
you
can
be
far
more
expressive
about
how
you
are
saving
that
data
and
the
way
I'm
doing
it
is
I'm
I'm
saving
the
data
in
the
way
I
want
to
read
it
on
my
analytics,
charts
I
don't
have
to
I.
A
A
Okay,
I
won't
talk
to
just
I
want
to
show
you
like
some
of
the
final
pieces.
There
too,
let
me
kind
of
put
in
the
whole
box
together
the
single
power
file
that
goes
in
the
back.
Can
I
save
or
stop
this.
Let's
see
you
can
see
the
pie
I'm
just
mounted
to
a
board
on
the
inside.
There,
I
3d
printed
out
a
case
for
it,
and
I
use
some
high-tech
duct
tape
to
kind
of
put
those
Carlo.
This
safe
make
sure
the
cables
are
in
place,
which
is
great.
A
A
Last
thing
I
must
show
here
to
is
there
we
go?
Some
reporting
I
did
put
a
front
end
together
for
this
and
I'm
saving,
and
that
so
I
can
dashboard
I
check
it
out,
I'm
still
working
on
doing
additional
reporting
for
it
too,
but
I
have
basic
stuff
for
it
too.
There's
a
link
to
the
site
too,
on
the
on
that
that
bitly
link
I
gave
you
as
well
so
great,
so
I
do
have
a
couple
more
to
do.
Items
I
do
want
to
do
it.
A
I
mentioned
this
is
a
work
in
progress,
but
something
I
want
to
do
is
hook
up
stitch
functions
to
do
like
weekly
email
reports,
so
I
don't
want
to
get
like
a
text
message
or
email
every
time,
I,
cackles,
bathroom
I
frankly,
don't
care
that
much
but
be
nice
to
get
like
some
like
weekly
data
or
some
I
aggregate
data
or
run
some
additional
analytics
on
it.
I'd
also
love
to
do
some
more
front-end
stuff
with
it
and
like
I
mentioned
I
would
love
to
juice
like
some
machine
learning
with
it.
A
I
just
want,
like
I,
said
I,
just
like
data
I'm
like
I,
want
to
like
I,
want
to
take
it
to
the
logical
extreme,
see
how
far
we're
gonna
push
it
so,
okay,
great
so
we
went
over
a
real-world
example.
I
hope
that
you
see
that
the
code
actually
isn't
that
complicated
we're
connecting
to
it.
We
tell
what
pin
that
go
to
and
we
have
some
callback
functions.
We
can
do
some
work
with
on
it.
It's
actually
not
that
bad,
but
we
talked
briefly
about
the
GPIO.
A
How
are
you
sending
data
out
and
in
to
the
board
we're
over
a
hello
world,
making
the
LED
blink
using
johnny-five
and
Raspberry
Pi?
We
went
over
the
code
for
how
I
did
that
switch
data
and
how
I
handle
the
load
cell
data.
We
went
over
the
spawn
child
process
to
handle
that
Python
subcode.
We
went
over
the
IOT
time
series
data
and
how
we
sent
that
to
the
club,
and
then
we
went
over
kind
of
my
next
steps
for
what
I
wanted
the
project
as
well.
A
Okay,
great,
let's
see
here
alright
last
part
here,
the
future
I
love
presentations
that
go
over
like
their
predictions.
This
stuff
is
all
speculative
they're,
educated
guesses,
but
it's
work.
I
I,
don't
know!
What's
next,
what's
next
time?
What's
what
are
we
can
circle
earth
to?
So
for
thanks,
I
see
first
thing:
duh
we're
gonna
continue
seeing
smaller
and
smaller
devices
that
are
more
powerful
I'm
using
the
Raspberry
Pi
3
B+.
The
resume
for
just
came
out.
A
Super-Powerful
overkill
for
my
project
didn't
need
it,
but
we're
gonna
continue
to
see
smaller
and
smaller
chips
being
added
on
every
day
and
I.
Think
that
trend
is
just
continue
happen.
We've
seen
stuff
like
even
chips,
you
can
sew
in
your
clothing,
we're
seeing
great
stuff
I
love
when
downside
the
JavaScript
currently
is
it's
footprint,
so
it's
garbage
collection,
it's
huge
and
it
takes
a
it's.
A
minor
memory
footprint
when
you're
installing
that
out
of
device
I
think
that
we're
gonna
see
JavaScript
footprint
getting
smaller
and
smaller
and
more
optimized
versions
for
for
Hardware,
too.
A
It
works
fine.
But
that
be
my
one
caveat:
if
space
and
memory
is
a
major
concern
for
you,
you
would
maybe
want
to
consider
using
C
or
C++
you're
handling
all
the
memory
on
your
own
there's
like
no
garbage,
let
it's
like
you're
responsible
for
of
it,
but
it
also
makes
it
way
more
efficient
to
run
on
a
piece
of
hardware.
A
We're
gonna,
see
better
hardware
support
I,
like
my
mentor,
the
load
cells
that
wasn't
so
currently
supported
by
a
four
by
Johnny
Five.
There's
a
issue
in
a
PR
open
for
it
right
now
to
get
it
fixed
and
get
it
natively
supported,
but
as
the
platform's
get
more
mature,
I
think
we're
gonna
continue
to
see
better
hardware
support
for
that
as
well,
and
then
this
one
is
always
the
tricky
one
and
honestly
I
think
is
the
biggest
issue
for
IOT
devices
today
and
that's
power
and
batteries.
A
I
think
we're
already
seeing
power
is
already
the
bottleneck
for
our
devices
today,
I
feel
like
everyone's
begging,
our
cell
phone
companies
to
get
better
battery
life
and
they're
doing
it,
mostly
through
software
and
like
just
optimizations
of
the
processes
to
make
better
use
of
the
battery
life.
I
feel
like
I'm
hacker
news
and
reddit
I
see
you
know,
graphite
battery
breakthrough
at
MIT
labs
or
whatever,
weekly
and
I
don't
know.
A
We
have
encourage
crack
that
yet,
like
my
my
litter
box
is
fine,
I
could
hook
this
up.
The
batteries
I
have
I
hooked
up
the
wall,
cuz
I'm
moving
much,
but
a
lot
of
wearables
have
that
Bower
bottlenecked
buy
it
okay,
great,
let's
do
a
quick
recap
and
then
we'll
wrap
it
up
here.
So
we
started
the
talk
today
with
just
doing
a
quick
introduction
to
IOT
I
t's.
Anything
we
put
a
chip
in
it.
A
We
talked
about
my
favorite
types
of
projects,
beings
just
stupid-ass
projects
and
IOT
market
is
growing
with
with
an
asterisks
there
why
you
should
be
considering
no
JavaScript
with
your
next
IOT
project,
58%
of
node
developers,
already
self-identify
or
IOT
developers,
always
our
self-identify
as
no
developers.
Javascript
is
a
great
choice
for
new
developers.
C
and
C++
are
awesome,
they're
more
challenging
to
learn
them
easy
to
update
over
a
network.
That's
already
speaking
job
script,
there's
a
ton
of
great
existing
libraries.
We
went
specifically
into
Johnny
Five
here
today.
A
Javascript
is
already
an
event-driven
language,
and
then
we
talked
a
little
bit
about
IOT
dated
best
practices.
So
when
you're
looking
for
a
IOT
database
or
database
to
save
your
IOT
data,
some
things
you
can
should
consider
are
looking
at
a
database.
That's
able
to
ingest
data
quickly,
one
that
is
event-driven.
Just
like
we
talked
about
javascript
of
the
callback
functions.
You
want
one
that
has
a
flexible
schema
so
that
you
can
add
additional
sensor
data
or
change
that
time.
A
Series
data
easily
and
look
for
databases,
they're
able
to
handle
time
series
data
well
to
traditional
RB
messes
can
do
it
well,
but,
like
we
saw
with
the
document
store,
it's
a
really
easy
native
way
to
do
that
and
it
works
great
for
reporting
in
analytics.
Then
we
went
over
a
real-world
example
of
my
IOT
kitty,
litter
box,
and
we
first
talked
about
the
GPIO
and
how
to
interact
with
the
real
world.
We
talked
about
that
IOT,
hello,
world
project,
making
the
LED
blink.
We
talked
about
that
switch
data
and
the
load
cells.
A
I'll
leave
this
up
here
too
I
see
someone
taking
photos,
okay,
so
next
steps,
if
I've
inspired
you
at
all
today,
I
hope.
The
goal
Dastak
is
to
give
you
a
just
a
gentle
introduction
to
it.
I
also
want
to
show
you
that
it's
okay
to
not
be
an
expert
at
hardware
to
jump
in
and
just
try
stuff
out
so
I
hope.
I've
I
want
to
lower
the
bar
of
entry
for
trying
your
own
project
and,
if
I've
inspired
you
to
do
that
today.
A
Awesome
and
I
just
want
to
talk
about
what
you
should
do
if
you're
interested
in
doing
it.
This
is
good.
This
may
be
lame,
but
I
just
just
make
something.
Make
some
stupid
make
an
LED
blink
make
something
for
you.
I
get
asked
all
the
time
like.
Are
you
gonna
monetize
this
or
sell
it
like
no
I
just
made
it
for
me,
I
think
it's
fun
and
stupid
and
I
learned
something
with
it.
A
You
know
and
any
project
it's
a
IOT
just
go
home
if
you
saw
Selene
spider
this
weekend,
I
saw
cool,
kubernetes
talk,
go
home
and
just
set
up
a
kubernetes
project.
Just
for
yourself
just
do
it
Google
things
get
stuck
on
figure
it
out.
You'll
figure
it
out,
you'll
everyone.
This
room
is
intelligent,
smart
people
who
can
figure
out
how
to
do
it
to
us
so
just
make
something
stupid
just
for
you
try
to
figure
it
out.