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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
73-11Mobile Environmental Sensing Using Smartphones
that the active phase lasts the shortest time possible. is is achieved by using “control messages,” which
me
ans
th
at
th
e
cl
ient
se
nds
to th
e
se
nsor
in
formation
su
ch
as “s
tart
me
asuring”
or “d
isconnect
fr
om
me.”
e se
cond
co
nsideration
is th
at
th
e
sl
eep
ti
me
do
es
no
t
in
uence
th
e
cu
rrent
co
nsumption
. In fac
t,
in
a 1 mi
n
me
asurement,
th
e
sl
eep
ph
ase
a
ects
cu
rrent
co
nsumption
ab
out
0.02
%
. Ne
glecting
th
is
te
rm
pe
rmits
c
alculating
t
he
b
attery
d
uration
i
n
t
erms
o
f
n
umber
o
f
m
easurements
(
since
t
he
c
onsumption
i
s
di
rectly
pr
oportional
to th
e
fr
equency
of me
asurement)
. Co
llected
da
ta,
av
eraged
ov
er
a 1 h pe
riod,
in
di-
cate
th
at
th
e
ch
osen
ba
ttery
(M
otorola
CR
2477,
10
00
mA
h)
sho
uld
la
st
fo
r
ab
out ...
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Publisher Resources

ISBN: 9781439848913