Arduous Arduinos
How can we make useful things?
g
1
B f
Before
we begin...
b i
Is there a need?
How do we fill this need?
Is technology appropriate for this need?
2
E
Example:
l P
Pulse
l O
Ox
Is there a need?
How do we fill this need?
Is technology appropriate for this need?
3
Courtesy of Google.com. Used with permission.
Th pulse
The
l oximeter
i t
how does it work?
4
Red Infrared
Photodetector
Image by MIT OpenCourseWare.
Th pulse
The
l oximeter
i t
how does it work?
5
10
(Red)
660 nm
(Infrared)
910 nm
Absorption
Hb
HbO2
0.1
600
700
800
900
Wavelength (nm)
1000
Image by MIT OpenCourseWare.
Th pulse
The
l oximeter
i t
how does it work?
6
H
How
d
does it work?
k?
Shines light
g through
g a finger
g
Measures light intensity
Converts intensity into blood oxygen level
7
S what
So
h t do
d we need?
d?
We need to shine a light through a finger
We need to measure light intensity
We need to display
y and record the collected data
We need to convert intensity into blood oxygen
level
8
Di l and
Display
d record?
d?
The world is complicated
We can break complicated systems down into
easier problems
p
We can use same data for multiple projects
9
Th pulse
The
l O
Oximeter
i t
how we did it
10
S what
So
h t do
d we need?
d?
We need to shine a light through a finger
11
Image made using http://fritzing.org/
li ht th
light
through
h a fifinger
how we did it
12
b
burn
Th
Through
h a fifinger
how We screwed up
13
S what
So
h t do
d we need?
d?
We need to shine a light through a finger
We need to measure light intensity
14
Courtesy of SparkFun Electronics. Used with permission.
M
Measuring
i th
the lilight
ht
how we did it
15
M
Measuring
i th
the lilight
ht
how we did it
16
Excerpts from TAOS Inc. product spec sheets removed due to copyright restrictions.
See Programmable Light-to-Frequency Converters spec sheets TSL230R-LF, TSL230AR-LF, and TSL230BR-LF.
M
Measuring
i th
the lilight
ht
how we did it
17
M
Measuring
i th
the lilight
ht
how we did it
18
M
Measuring
i th
the lilight
ht
how we did it
19
M
Measuring
i th
the lilight
ht
how we did it
20
S what
So
h t do
d we need?
d?
We need to shine a light
g through
g a finger
g
We need to measure light intensity
We need to display and record the collected data
21
graphing
hi and
d storing
t i
how we did it
22
graphing
hi and
d storing
t i
how we did it
23
graphing
hi and
d storing
t i
how we did it
24
graphing
hi and
d storing
t i
how we did it
25
graphing
hi and
d storing
t i
how we did it
26
S what
So
h t do
d we need?
d?
We need to shine a light through a finger
We need to measure light intensity
We need to display
y and record the collected data
We need to convert intensity into blood oxygen
level
27
How do we get the
yg level?
blood oxygen
Process the data!
Conditional statements (if)
Control statements (while
(while, for)
Translating
g the abstract p
problem into a logical
g
one
28
How can I learn about
p g
programming?
g
Websites ((Processing,
g, Python,
y
, C))
Books (O’Reilly collection is free!)
Ask a friend
29
M i Id
Main
Ideas
Understand the problem
Break down the problem
Design each block
Experiment!
p
30
Q
Questions?
ti
?
I can’t have possibly explained everything in the right way to everyone
31
SURPRISE!
Now yyou have to build the system
y
32
MIT OpenCourseWare
http://ocw.mit.edu
EC.710 D-Lab: Medical Technologies for the Developing World
Spring 2010
For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms.