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y
to
u
s
e
b
u
t
p
o
wer
f
u
l,
af
f
o
r
d
a
b
le
an
d
ap
a
r
t
f
r
o
m
b
ein
g
h
ar
d
to
b
r
ea
k
,
R
asp
b
er
r
y
Pi is
th
e
p
er
f
ec
t d
e
v
ice
f
o
r
asp
ir
i
n
g
co
m
p
u
ter
s
ci
en
tis
ts
[
2
4
]
.
I
n
th
e
m
a
r
k
et
th
er
e
ar
e
s
ev
er
al
ty
p
es
o
f
h
o
m
e
s
ec
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s
y
s
tem
s
,
b
u
t
s
o
m
e
ex
am
p
les
o
f
p
r
o
d
u
cts
o
f
f
er
ed
ar
e
less
th
an
p
r
o
v
i
d
e
m
o
r
e
f
lex
i
b
ilit
y
in
th
eir
u
s
e.
Pro
v
is
io
n
o
f
ty
p
e
a
n
d
n
u
m
b
e
r
o
f
d
ev
ices
in
th
e
f
o
r
m
o
f
lim
ited
s
en
s
o
r
s
an
d
p
r
ices
o
f
f
er
e
d
ar
e
r
elativ
ely
e
x
p
en
s
iv
e.
An
ex
am
p
le
o
f
im
p
le
m
en
tin
g
a
n
in
ter
n
et
p
r
o
to
co
l
(
IP
)
ca
m
er
a
-
b
ased
h
o
m
e
s
ec
u
r
ity
s
y
s
tem
with
an
al
ar
m
d
etec
to
r
o
r
s
am
p
lin
g
th
r
o
u
g
h
ac
tiv
e
in
f
r
ar
e
d
tech
n
o
lo
g
y
h
as a
d
e
f
icien
cy
,
o
n
e
o
f
wh
ic
h
is
n
o
t p
r
o
v
id
i
n
g
f
l
ex
ib
ilit
y
f
o
r
u
s
er
s
wh
en
tr
av
ell
in
g
.
T
h
is
r
esear
ch
will
also
ad
d
s
ev
er
al
s
en
s
o
r
s
n
am
ely
PIR
s
en
s
o
r
,
DH
T
2
2
tem
p
er
atu
r
e
s
en
s
o
r
an
d
MQ
2
s
m
o
k
e
s
en
s
o
r
.
Sen
d
in
g
in
f
o
r
m
atio
n
in
r
ea
l
-
tim
e
u
s
in
g
th
e
T
eleg
r
am
Me
s
s
en
g
er
a
p
p
li
ca
tio
n
th
at
h
as
an
au
to
m
atic
an
s
wer
in
g
ac
co
u
n
t.
T
eleg
r
am
s
ca
n
r
esp
o
n
d
to
ce
r
tain
tex
ts
ac
co
r
d
in
g
to
th
e
c
o
m
m
an
d
s
we
g
iv
e.
T
h
e
ca
m
er
a
u
s
ed
f
o
r
m
o
n
ito
r
in
g
is
a
R
asp
icam
ca
m
er
a.
I
f
o
n
e
o
f
th
e
s
en
s
o
r
s
is
ac
tiv
e,
it
will
tr
ig
g
er
th
e
ca
m
er
a
co
n
n
ec
ted
to
th
e
R
asp
b
er
r
y
Pi
to
tak
e
p
h
o
to
s
an
d
s
en
d
n
o
tific
atio
n
s
v
ia
th
e
T
eleg
r
am
m
ess
en
g
er
ap
p
licatio
n
.
Af
ter
th
at,
th
e
b
o
t o
n
T
eleg
r
am
Me
s
s
en
g
er
o
f
f
er
s
wh
at
we
wan
t to
d
o
n
ex
t,
th
er
e
two
p
o
s
s
ib
ilit
ies
ca
n
b
e
d
o
n
e
b
y
th
is
b
o
t,
wh
ic
h
is
to
tak
e
a
p
h
o
to
o
r
v
id
eo
o
f
th
e
s
itu
atio
n
at
h
o
m
e
at
th
at
tim
e
an
d
s
en
d
it
b
ac
k
to
th
e
u
s
er
.
T
h
is
to
o
l is ex
p
ec
ted
to
b
e
a
b
le
to
m
o
n
ito
r
t
h
e
s
tate
o
f
th
e
h
o
u
s
e
an
d
s
en
d
n
o
tific
atio
n
s
to
th
e
h
o
m
eo
wn
e
r
if
th
er
e
is
in
ter
f
er
en
ce
with
th
e
h
o
u
s
e.
2.
RE
S
E
ARCH
M
E
T
H
O
D
I
n
th
is
p
ap
er
we
u
s
e
th
e
s
y
s
tem
d
ev
el
o
p
m
e
n
t
life
cy
cle
(
SDLC)
m
eth
o
d
s
h
o
wn
in
Fig
u
r
e
1
,
with
th
e
f
o
llo
win
g
s
tag
es:
-
Plan
n
in
g
Fro
m
th
e
r
esu
lts
o
f
id
en
tific
a
tio
n
,
p
r
o
b
lem
s
th
at
o
f
ten
o
cc
u
r
in
clu
d
e
;
1
)
f
r
ee
r
o
o
m
ac
ce
s
s
,
2
)
f
r
ee
ac
ce
s
s
with
o
u
t
k
n
o
wled
g
e,
3
)
lack
o
f
s
ec
u
r
ity
,
4
)
r
o
o
m
te
m
p
er
atu
r
e
in
f
o
r
m
atio
n
,
an
d
5
)
r
o
o
m
air
co
n
d
itio
n
in
f
o
r
m
atio
n
,
wh
eth
er
it
is
g
o
o
d
f
o
r
t
h
e
b
o
d
y
.
Fr
o
m
th
ese
p
r
o
b
lem
s
will
b
e
d
esig
n
ed
a
s
y
s
tem
th
at
ca
n
p
r
o
v
id
e
in
f
o
r
m
atio
n
to
th
e
u
s
er
.
-
An
aly
s
is
Af
ter
k
n
o
win
g
th
e
p
r
o
b
lem
a
n
d
m
a
k
e
a
g
en
er
al
d
escr
ip
tio
n
o
f
th
e
s
y
s
tem
.
T
h
is
s
tag
e
an
aly
ze
s
th
e
n
ee
d
s
in
d
esig
n
in
g
an
d
b
u
ild
i
n
g
s
y
s
tem
s
.
E
q
u
ip
m
en
t
an
d
m
ater
ial
r
eq
u
ir
em
en
ts
in
clu
d
e
;
1
)
R
asb
er
r
y
Pi
3
B
,
2
)
b
u
zz
er
m
o
d
u
le,
3
)
lig
h
t
em
itin
g
d
io
d
e
(
L
E
D)
,
4
)
m
ess
ag
e
q
u
eu
e
(
MQ
)
m
o
d
u
le
,
5
)
tem
p
er
atu
r
e
a
n
d
h
u
m
id
ity
s
en
s
o
r
(
DHT
)
m
o
d
u
l
e
,
6
)
p
ea
r
m
o
d
u
le
,
a
n
d
7
)
ca
m
er
a
m
o
d
u
le
.
-
Desig
n
T
h
e
s
tag
es
o
f
d
esig
n
ar
e
as
f
o
llo
ws
;
1
)
Pre
p
ar
in
g
th
e
s
y
s
tem
d
esig
n
,
2
)
s
y
s
tem
co
n
f
ig
u
r
atio
n
,
3
)
s
y
s
tem
co
n
f
ig
u
r
atio
n
v
alid
a
tio
n
,
4
)
c
h
o
o
s
in
g
th
e
b
est s
y
s
tem
co
n
f
ig
u
r
atio
n
.
-
I
m
p
lem
en
tatio
n
T
h
e
n
ex
t
s
tep
is
to
im
p
lem
en
t
th
e
d
esig
n
,
n
am
ely
;
1
)
p
r
ep
ar
e
to
o
ls
an
d
m
ater
ials
,
2
)
I
n
s
tall
th
e
co
n
tr
o
ller
,
3
)
Setu
p
all
co
m
p
o
n
en
t
m
o
d
u
les
,
4
)
I
n
s
tall
th
e
en
tire
co
m
p
o
n
en
t
lib
r
ar
y
,
5
)
Setu
p
S
u
p
p
o
r
tin
g
so
f
twar
e,
6
)
s
y
s
tem
co
d
i
n
g
,
7
)
s
y
s
tem
co
n
f
ig
u
r
atio
n
,
a
n
d
8
)
s
y
s
tem
test
in
g
.
-
T
esti
n
g
Fu
r
th
er
m
o
r
e
,
th
e
p
r
o
ce
s
s
o
f
test
in
g
an
d
in
teg
r
atio
n
,
th
is
p
r
o
ce
s
s
will
b
e
test
ed
to
f
in
d
o
u
t
h
o
w
r
esis
tan
t
th
e
s
y
s
tem
is
in
p
r
o
c
ess
in
g
in
f
o
r
m
atio
n
d
ata.
T
h
e
f
o
llo
win
g
ar
e
th
e
test
in
g
s
tag
es
;
1
)
t
h
e
s
y
s
tem
will
b
e
test
ed
wh
eth
er
it
ca
n
o
v
er
co
m
e
th
e
p
r
o
b
lem
ac
co
r
d
i
n
g
to
th
e
p
lan
n
in
g
s
tag
e,
2
)
af
ter
th
e
s
y
s
tem
wo
r
k
s
well,
th
e
s
y
s
tem
will
b
e
im
p
l
em
en
ted
r
ev
iewe
d
,
an
d
3
)
m
o
d
if
icatio
n
o
f
t
h
e
s
y
s
tem
a
f
ter
s
ev
er
al
p
eo
p
le
u
s
e
th
is
s
y
s
tem
th
e
d
ata
will b
e
ac
co
m
m
o
d
ate
d
an
d
d
o
n
e
ac
co
r
d
in
g
to
th
e
s
h
ap
e
an
d
s
y
s
tem
u
p
g
r
ad
e.
-
Ma
in
ten
an
ce
Af
ter
th
e
p
r
o
ce
s
s
o
f
test
in
g
a
n
d
in
teg
r
ati
n
g
th
e
s
y
s
tem
wil
l
b
e
u
p
d
ated
o
r
m
ain
tain
e
d
if
th
e
u
s
er
wan
ts
to
ad
d
n
ew
f
ea
t
u
r
es
o
r
m
o
d
u
les
th
at
m
ay
b
e
d
ev
elo
p
ed
ag
ai
n
f
o
r
th
e
p
r
e
v
io
u
s
s
y
s
tem
.
So
th
at
th
e
p
r
ev
io
u
s
s
y
s
tem
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co
n
tin
u
e
to
co
m
p
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en
t
ea
ch
o
th
er
an
d
clo
s
e
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e
s
h
o
r
tco
m
in
g
s
o
f
th
e
p
r
ev
io
u
s
s
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s
tem
b
e
it p
h
y
s
ical,
s
o
f
twar
e,
o
r
co
m
p
o
n
e
n
t m
o
d
if
ie
r
s
.
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I
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u
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R
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m
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2
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2
.
1
.
H
o
m
e
s
ec
urit
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m
o
nito
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s
y
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I
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m
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b
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m
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ex
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n
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ter
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u
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o
r
,
PIR
s
en
s
o
r
,
tem
p
er
atu
r
e
s
en
s
o
r
a
n
d
ca
m
er
a
m
o
d
u
le
.
T
h
e
s
ec
tio
n
will
b
ec
o
m
e
a
s
in
g
le
s
y
s
tem
th
at
ca
n
b
e
co
n
tr
o
lled
th
r
o
u
g
h
th
e
teleg
r
am
s
y
s
tem
.
So
th
e
s
y
s
tem
will
wo
r
k
f
o
r
s
ec
u
r
ity
,
m
o
n
ito
r
i
n
g
an
d
en
v
ir
o
n
m
en
tal
co
n
d
itio
n
s
an
d
m
o
r
e
s
p
ec
if
ically
s
u
ch
as
g
as
d
en
s
ity
,
tem
p
er
atu
r
e
a
n
d
m
o
v
em
en
t
o
f
o
b
jects
to
b
e
r
ec
o
r
d
e
d
/cap
tu
r
e
d
.
T
h
ese
th
in
g
s
will
b
e
av
ailab
le
in
f
o
r
m
atio
n
o
n
th
e
s
y
s
tem
.
Har
d
war
e
is
co
n
n
ec
ted
th
r
o
u
g
h
two
ev
en
ts
n
am
ely
v
ia
wif
i
an
d
E
th
er
n
et
w
h
ich
alr
ea
d
y
h
as
in
ter
n
et
ac
ce
s
s
.
Pro
to
co
l
f
o
r
co
m
m
u
n
icatio
n
b
etwe
en
teleg
r
am
an
d
s
y
s
tem
v
ia
th
e
m
p
r
o
to
p
r
o
to
co
l.
W
h
er
e
m
p
r
o
to
p
r
o
to
co
l
co
n
s
is
ts
o
f
s
ev
er
al
ty
p
es
o
f
p
r
o
to
co
ls
a
m
o
n
g
o
th
er
th
in
g
s
n
am
ely
tr
an
s
m
is
s
io
n
co
n
tr
o
l
p
r
o
t
o
co
l
(
T
C
P
)
,
web
s
o
ck
et,
web
s
o
ck
et
o
v
er
h
y
p
er
tex
t
tr
a
n
s
f
er
p
r
o
to
c
o
l
(
HT
T
P
)
,
HT
T
P
s
ec
u
r
e
(
HT
T
PS
)
,
u
s
er
d
ata
g
r
a
m
p
r
o
t
o
co
l
(
UDP
)
.
Ov
er
all,
th
is
p
r
o
to
c
o
l w
ill allo
w
th
e
s
ec
u
r
ity
m
o
n
ito
r
in
g
s
y
s
t
em
h
ar
d
war
e
t
o
co
m
m
u
n
icate
with
teleg
r
am
s
.
On
s
y
s
tem
s
th
at
h
av
e
s
y
n
ch
r
o
n
ized
with
ex
is
tin
g
p
r
o
to
co
ls
.
W
h
er
e
th
er
e
is
a
B
OT
in
ch
ar
g
e
o
f
m
an
ag
in
g
th
e
d
ata
r
ec
eiv
ed
.
An
d
p
r
o
v
id
e
o
u
t
p
u
t
ac
co
r
d
in
g
to
u
s
er
d
em
a
n
d
.
T
h
e
telep
o
r
t
s
y
s
tem
th
at
h
as
b
ee
n
b
u
ilt
h
as
s
ec
u
r
ity
,
th
at
is
,
th
e
s
y
s
tem
ca
n
d
is
t
in
g
u
is
h
b
etwe
en
u
s
er
s
wh
o
ar
e
al
r
ea
d
y
r
eg
is
ter
ed
with
th
e
s
y
s
t
em
an
d
illeg
al
u
s
er
s
wh
o
ac
ce
s
s
th
e
s
y
s
tem
.
W
h
er
e
ch
ec
k
in
g
is
ca
r
r
ied
o
u
t
at
th
e
B
OT
s
es
s
io
n
in
d
is
tin
g
u
i
s
h
in
g
u
s
er
s
wh
o
h
av
e
ac
ce
s
s
an
d
illeg
al
u
s
er
s
.
I
n
th
e
u
s
er
s
es
s
io
n
,
th
e
s
y
s
tem
ch
ec
k
s
th
e
co
m
m
an
d
s
s
en
t
b
y
th
e
u
s
er
an
d
th
e
s
y
s
tem
will
v
alid
ate
wh
eth
er
th
e
d
ata
is
av
ailab
le
an
d
ca
n
b
e
p
r
o
ce
s
s
ed
b
y
th
e
s
y
s
tem
.
I
f
th
e
co
m
m
an
d
d
o
es
n
o
t
m
atch
th
e
s
y
s
tem
will
n
o
tify
th
e
u
s
er
,
th
at
t
h
e
co
m
m
an
d
is
in
v
alid
.
An
d
co
n
v
er
s
ely
if
th
e
co
m
m
an
d
is
v
ali
d
th
en
th
e
s
y
s
tem
will
o
u
tp
u
t
in
f
o
r
m
atio
n
th
at
m
atch
es
th
e
g
i
v
en
u
s
er
co
m
m
an
d
.
An
d
th
e
s
y
s
tem
will
s
en
d
t
h
e
in
f
o
r
m
atio
n
to
th
e
teleg
r
am
.
So
,
wh
en
a
u
s
er
ac
ce
s
s
es
th
e
s
y
s
tem
,
th
e
u
s
er
will
b
e
ch
e
ck
ed
b
y
th
e
s
y
s
tem
f
ir
s
t,
b
ef
o
r
e
ac
ce
s
s
in
g
th
e
s
y
s
tem
.
Af
ter
o
b
tain
in
g
ac
ce
s
s
p
er
m
is
s
io
n
s
f
r
o
m
th
e
s
y
s
tem
th
e
u
s
er
ca
n
g
i
v
e
co
m
m
an
d
s
to
t
h
e
s
y
s
tem
f
o
r
i
n
f
o
r
m
atio
n
av
ailab
le
o
n
th
e
s
y
s
tem
.
2
.
2
.
So
f
t
wa
re
At
th
is
s
tep
,
th
e
R
a
s
p
b
er
r
y
Pi
s
o
f
twar
e
i
s
in
s
ta
lled
.
T
h
is
r
esear
ch
u
s
es
s
o
f
twar
e,
n
am
ely
th
e
o
p
er
atin
g
s
y
s
tem
r
asp
b
ian
,
p
y
th
o
n
,
an
d
teleg
r
am
m
ess
en
g
er
.
First,
in
s
ta
ll
th
e
R
a
s
p
b
er
r
y
Pi
with
th
e
R
a
s
p
b
ian
o
p
er
atin
g
s
y
s
tem
.
B
ef
o
r
e
in
s
t
allin
g
th
e
R
asp
b
er
r
y
Pi
R
asp
b
ian
ap
p
licatio
n
,
th
is
R
asp
b
ian
ap
p
licatio
n
ca
n
b
e
d
o
wn
lo
ad
e
d
v
ia
th
e
o
f
f
icial
web
s
ite
o
f
R
asp
b
er
r
y
Pi.
T
h
e
in
itial
s
tag
e
in
r
u
n
n
in
g
a
p
y
th
o
n
a
p
p
licatio
n
is
,
ce
r
tain
ly
R
asp
b
er
r
y
Pi
is
alr
e
ad
y
aliv
e,
t
h
en
s
elec
t
th
e
h
o
m
e
m
en
u
o
f
th
e
R
asp
b
er
r
y
Pi
i
n
th
e
to
p
lef
t
co
r
n
er
th
en
s
elec
t
th
e
p
y
th
o
n
ap
p
licatio
n
.
2
.
3
.
M
a
k
ing
t
he
pro
j
ec
t
2
.
3
.
1
.
Desig
n t
he
dev
ice
I
n
th
e
f
ir
s
t
s
tag
e,
th
er
e
ar
e
a
3
-
p
in
PIR
s
en
s
o
r
,
p
in
f
o
r
VC
C
,
o
u
tp
u
t,
an
d
g
r
o
u
n
d
.
T
h
e
V
C
C
p
in
i
s
co
n
n
ec
ted
to
th
e
5
v
p
i
n
o
n
th
e
r
asp
b
er
r
y
p
i,
th
e
o
u
t
p
u
t
p
in
is
co
n
n
ec
ted
to
th
e
GPI
O
R
asp
b
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r
y
Pi
p
in
,
h
er
e
is
co
n
n
ec
ted
t
o
p
in
7
(
GPI
O4
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,
a
n
d
th
e
g
r
o
u
n
d
p
in
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co
n
n
ec
te
d
to
th
e
g
r
o
u
n
d
p
in
o
n
th
e
R
asp
b
er
r
y
Pi.
Sh
o
wn
in
Fig
u
r
e
3
(
a)
.
I
n
th
e
s
ec
o
n
d
s
te
p
,
th
e
MQ
2
s
en
s
o
r
is
co
n
n
ec
t
ed
to
th
e
R
asp
b
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r
y
Pi.
On
t
h
e
MQ
2
s
en
s
o
r
th
er
e
ar
e
4
p
in
s
n
am
ely
VC
C
,
g
r
o
u
n
d
,
an
alo
g
,
an
d
d
ig
ital
p
in
s
.
B
ec
au
s
e
R
a
s
p
b
er
r
y
Pi
3
ca
n
n
o
t
r
ea
d
an
al
o
g
p
in
s
f
r
o
m
th
e
MQ
2
s
en
s
o
r
,
an
an
alo
g
to
d
ig
ital
co
n
v
er
ter
is
ad
d
ed
.
Sh
o
wn
in
Fig
u
r
e
3
(
b
)
.
T
h
e
th
ir
d
s
tag
e
is
co
n
n
ec
tin
g
th
e
R
asp
b
er
r
y
Pi DHT
2
2
Sen
s
o
r
wh
ich
ca
n
b
e
s
ee
n
in
Fig
u
r
e
3
(
c)
.
(
a)
(
b)
(
c)
Fig
u
r
e
3
.
T
h
e
d
esig
n
o
f
th
e
h
o
m
e
s
ec
u
r
ity
m
o
n
ito
r
in
g
s
y
s
te
m
;
(
a)
th
e
PIR sen
s
o
r
is
co
n
n
ec
te
d
to
th
e
R
asp
b
er
r
y
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(
b
)
MQ
2
s
en
s
o
r
is
co
n
n
ec
ted
with
R
asp
b
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r
y
Pi
,
an
d
(
c)
T
h
e
DHT
2
2
s
en
s
o
r
is
co
n
n
ec
ted
to
a
R
asp
b
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r
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en
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p
r
o
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am
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with
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g
a
b
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ac
co
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n
t
o
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th
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ess
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teleg
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at
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d
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s
talled
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s
m
ar
t
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e.
Af
ter
t
h
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m
a
k
e
a
p
r
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am
co
d
e
f
o
r
ea
c
h
s
en
s
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r
.
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h
e
p
r
o
g
r
am
co
d
e
is
wr
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u
s
in
g
a
p
y
th
o
n
ap
p
lic
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n
th
at
is
alr
ea
d
y
in
s
talled
o
n
R
asp
b
er
r
y
Pi.
I
n
th
e
teleg
r
am
m
ess
en
g
er
th
er
e
is
th
e
ter
m
B
o
tTo
k
en
(
wh
er
e
B
o
tTo
k
en
is
an
id
e
n
tific
atio
n
co
d
e
o
f
a
n
ac
co
u
n
t
th
at
w
as
o
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tain
ed
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e
n
r
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ter
in
g
a
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r
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ac
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o
u
n
t)
.
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th
is
s
tag
e,
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m
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o
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u
n
t
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ea
ted
u
s
in
g
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d
r
o
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ased
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r
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p
licatio
n
.
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o
m
a
k
e
th
e
p
r
o
g
r
a
m
co
d
e
in
th
e
f
ir
s
t
R
asp
b
er
r
y
Pi
ad
d
v
ar
iab
les
if
th
er
e
ar
e
v
ar
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les
th
at
ar
e
n
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k
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o
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to
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n
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talled
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n
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s
p
b
ian
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T
h
e
f
o
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g
is
s
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ip
p
et
c
o
d
e:
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t,
d
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th
e
p
in
th
at
is
co
n
n
ec
ted
to
th
e
s
en
s
o
r
,
an
d
r
asp
icam
o
n
th
e
R
asp
b
er
r
y
Pi.
Af
ter
th
at,
m
ak
e
th
e
co
d
e
to
co
n
n
ec
t
th
e
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asp
b
er
r
y
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with
th
e
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g
r
am
u
s
in
g
b
o
tT
o
k
en
th
at
h
a
s
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ee
n
o
b
tain
ed
in
m
ak
in
g
b
o
ts
o
n
th
e
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r
am
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T
h
e
f
o
llo
w
in
g
is
co
d
e
s
n
ip
p
et:
A
f
t
e
r
t
h
a
t
,
c
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t
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li
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k
m
e
s
s
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g
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t
h
a
t
w
il
l
b
e
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s
e
d
as
a
c
h
a
t
m
e
d
i
a
b
e
t
we
e
n
t
h
e
R
a
s
p
b
er
r
y
P
i
a
n
d
t
e
l
e
g
r
a
m
.
P
r
o
g
r
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m
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4
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5
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A.
D.
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a
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,
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6
]
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8
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.
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(S
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.
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1
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A.
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,
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m
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Us
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In
t
.
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.
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.
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3
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4
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[2
6
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Ba
d
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n
P
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sa
t
S
tatisti
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,
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In
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