My talk at RobotsConf 2013 about Electrical Theory Fundamentals, I called it EEE. See my blog post for more resources and better places to learn. http://www.roborooter.com/post/1486/eee-presentation-at-robotsconf-2013/

1. EEE
Electrical Engineering Excitement
Saturday, December 7, 13

2. If you wish to make an apple
pie from scratch, you must first
invent the universe.
Carl Sagan (Cosmos p218)
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3. If you wish to make a robot from
scratch, you must first learn
some basic electrical theory.
Not Carl Sagan (Cosmos p218)
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4. What this gets you
•
•
•
•
•
•
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LEDs
Lasers
Servos
Motors
Touch Sensors
Switches
•
•
•
•
•
•
Light Sensors
Joysticks
LCD Displays
Accelerometers
Radios
oh so much more

5. ELECTRONS
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6. ELECTRONS
e-
eeee-
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•
•
•
Negatively Charged
Like to be evenly spaced
Flow from negative areas to
positive areas
+

7. ELECTRONS
•
-
•
•
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eThe flow of electrons is the
basis of electricity
e-
Current = Electrons per
second (measured in Amps)
Voltage = difference
between the positive and
negative charges (measured
in Volts)
e-
+
ee-

8. ELECTRONS
e-
•
-
•
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The the larger the
difference between negative
and positive charges the
faster the electrons will
flow.
More voltage leads to more
amperage
+

9. ELECTRONS
e-
•
-
•
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The the larger the
difference between negative
and positive charges the
faster the electrons will
flow.
More voltage leads to more
amperage
+

10. ELECTRONS
Meow!
•
-
•
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The the larger the
difference between negative
and positive charges the
faster the electrons will
flow.
More voltage leads to more
amperage
e-
+

11. Voltage Terms
•
•
•
•
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VCC
Vin
+5v
Vout
•
•
•
•
GND (Ground)
0v
-5v
-

12. Conductors
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13. Conductors
• Electrons flow over a Conductor
• Some conductors pass electrons better than others.
You measure this ability in units of resistance.
• Copper wire is the commonly used conductor today
• Humans will are less commonly used
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14. Resistors
• All Conductors have some resistance
• The unit of electrical resistance is the ohm Ω
• Comparable to friction
• Resistors can be useful to slow down the
electrons
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15. Ohms Law
V=IR
Voltage = Current * Resistance
Resistance = Voltage / Current
Current = Voltage / Resistance
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16. Resistor Symbols
Resistor
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Rheostat
Potentiometer

17. Voltage Symbols
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18. Diagrams
1.
+5V (Red)
2.
−Data (White)
3.
+Data (Green)
4.
GND (Black)
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19. Diagrams
•
•
Symbols rule
•
•
Know the terms
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US Style, IEC style, stuff
people make up style
Identify the electron flow

20. LEDs
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21. LEDs
•
•
Silicon Voltage Drop (1.2v)
•
Max Current listed in
docs. Often 10-20mA
•
Needs a resistor for
protection
•
•
R =V / I
Adjust current for
brightness
(5v - 1.2v) / 0.02A = 190 Ω
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22. Diagrams
What’s going on here?
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23. SERVOS
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24. SERVOS
•
•
•
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Black GND
RED +5v
Yellow PWM Signal

25. What’s PWM?
•
•
•
% of time the voltage is
at Vin is the duty cycle
•
Servos understand this
to be % of angle I
should turn
•
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Pulse Width Modulation
LEDS brightness is
affected
Voltage switches
between 0v and Vin

26. What’s TTL?
• It’s how most digital logic communicates
• It encodes 0s and 1s into +5v and 0v
• or +3v and 0v
• Some devices work on both voltages
• Some break with the wrong voltage
Saturday, December 7, 13

27. DIP Chips
•
•
Dual Inline Pin
•
“Bite” of the Chip is at
the top
•
The “Pin Out” or “data
sheet” tells you what
each pin does
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Pins are Numbered
Counter Clockwise

28. 555 Timer
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29. DATA SHEETS
Read Them
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30. What did we learn?
• Electron Flow
• Voltage = Current * Resistance
• How to Read Diagrams
• How LEDs, Servo’s and DIP Chips work
• PWM & TTL
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31. Image Credits
•
https://en.wikipedia.org/wiki/
Crook%27s_Tube
•
http://en.wikipedia.org/wiki/
LED
•
http://www.adafruit.com/
products/758
•
•
https://en.wikipedia.org/wiki/
Copper_wire_and_cable#Soli
d_vs._stranded
http://mcuoneclipse.com/
2013/05/30/tutorial-arduinomotorstepperservo-shieldpart-1-servos/
•
•
http://biorob.epfl.ch/cheetah
•
•
http://learn.adafruit.com/
http://www.rapidtables.com/
electric/electrical_symbols.htm
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http://electronicsclub.info/
circuitsymbols.htm

32. INSTRUCTABOTS.COM
SHARE YOUR ROBOT’S CODE, PARTS AND STORY
Saturday, December 7, 13

33. Meow!
INSTRUCTABOTS.COM
SHARE YOUR ROBOT’S CODE, PARTS AND STORY
Saturday, December 7, 13

34. Francis Gulotta
@reconbot github.com/reconbot
rbrtr.com wizarddevelopment.com
Saturday, December 7, 13