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EEE (Electrical Theory Fundamentals) RobotsConf 2013
 

EEE (Electrical Theory Fundamentals) RobotsConf 2013

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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. ...

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/

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    EEE (Electrical Theory Fundamentals) RobotsConf 2013 EEE (Electrical Theory Fundamentals) RobotsConf 2013 Presentation Transcript

    • EEE Electrical Engineering Excitement Saturday, December 7, 13
    • If you wish to make an apple pie from scratch, you must first invent the universe. Carl Sagan (Cosmos p218) Saturday, December 7, 13
    • If you wish to make a robot from scratch, you must first learn some basic electrical theory. Not Carl Sagan (Cosmos p218) Saturday, December 7, 13
    • What this gets you • • • • • • Saturday, December 7, 13 LEDs Lasers Servos Motors Touch Sensors Switches • • • • • • Light Sensors Joysticks LCD Displays Accelerometers Radios oh so much more
    • ELECTRONS Saturday, December 7, 13
    • ELECTRONS e- eeee- Saturday, December 7, 13 • • • Negatively Charged Like to be evenly spaced Flow from negative areas to positive areas +
    • ELECTRONS • - • • Saturday, December 7, 13 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-
    • ELECTRONS e- • - • Saturday, December 7, 13 The the larger the difference between negative and positive charges the faster the electrons will flow. More voltage leads to more amperage +
    • ELECTRONS e- • - • Saturday, December 7, 13 The the larger the difference between negative and positive charges the faster the electrons will flow. More voltage leads to more amperage +
    • ELECTRONS Meow! • - • Saturday, December 7, 13 The the larger the difference between negative and positive charges the faster the electrons will flow. More voltage leads to more amperage e- +
    • Voltage Terms • • • • Saturday, December 7, 13 VCC Vin +5v Vout • • • • GND (Ground) 0v -5v -
    • Conductors Saturday, December 7, 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 Saturday, December 7, 13
    • 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 Saturday, December 7, 13
    • Ohms Law V=IR Voltage = Current * Resistance Resistance = Voltage / Current Current = Voltage / Resistance Saturday, December 7, 13
    • Resistor Symbols Resistor Saturday, December 7, 13 Rheostat Potentiometer
    • Voltage Symbols Saturday, December 7, 13
    • Diagrams 1. +5V (Red) 2. −Data (White) 3. +Data (Green) 4. GND (Black) Saturday, December 7, 13
    • Diagrams • • Symbols rule • • Know the terms Saturday, December 7, 13 US Style, IEC style, stuff people make up style Identify the electron flow
    • LEDs Saturday, December 7, 13
    • 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 Saturday, December 7, 13
    • Diagrams What’s going on here? Saturday, December 7, 13
    • SERVOS Saturday, December 7, 13
    • SERVOS • • • Saturday, December 7, 13 Black GND RED +5v Yellow PWM Signal
    • What’s PWM? • • • % of time the voltage is at Vin is the duty cycle • Servos understand this to be % of angle I should turn • Saturday, December 7, 13 Pulse Width Modulation LEDS brightness is affected Voltage switches between 0v and Vin
    • 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
    • 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 Saturday, December 7, 13 Pins are Numbered Counter Clockwise
    • 555 Timer Saturday, December 7, 13
    • DATA SHEETS Read Them Saturday, December 7, 13
    • What did we learn? • Electron Flow • Voltage = Current * Resistance • How to Read Diagrams • How LEDs, Servo’s and DIP Chips work • PWM & TTL Saturday, December 7, 13
    • 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 Saturday, December 7, 13 http://electronicsclub.info/ circuitsymbols.htm
    • INSTRUCTABOTS.COM SHARE YOUR ROBOT’S CODE, PARTS AND STORY Saturday, December 7, 13
    • Meow! INSTRUCTABOTS.COM SHARE YOUR ROBOT’S CODE, PARTS AND STORY Saturday, December 7, 13
    • Francis Gulotta @reconbot github.com/reconbot rbrtr.com wizarddevelopment.com Saturday, December 7, 13