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. http://www.roborooter.com/post/1486/eee-presentation-at-robotsconf-2013/

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EEE (Electrical Theory Fundamentals) RobotsConf 2013

  1. 1. EEE Electrical Engineering Excitement Saturday, December 7, 13
  2. 2. If you wish to make an apple pie from scratch, you must first invent the universe. Carl Sagan (Cosmos p218) Saturday, December 7, 13
  3. 3. 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
  4. 4. 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
  5. 5. ELECTRONS Saturday, December 7, 13
  6. 6. ELECTRONS e- eeee- Saturday, December 7, 13 • • • Negatively Charged Like to be evenly spaced Flow from negative areas to positive areas +
  7. 7. 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-
  8. 8. 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 +
  9. 9. 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 +
  10. 10. 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- +
  11. 11. Voltage Terms • • • • Saturday, December 7, 13 VCC Vin +5v Vout • • • • GND (Ground) 0v -5v -
  12. 12. Conductors Saturday, December 7, 13
  13. 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
  14. 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 Saturday, December 7, 13
  15. 15. Ohms Law V=IR Voltage = Current * Resistance Resistance = Voltage / Current Current = Voltage / Resistance Saturday, December 7, 13
  16. 16. Resistor Symbols Resistor Saturday, December 7, 13 Rheostat Potentiometer
  17. 17. Voltage Symbols Saturday, December 7, 13
  18. 18. Diagrams 1. +5V (Red) 2. −Data (White) 3. +Data (Green) 4. GND (Black) Saturday, December 7, 13
  19. 19. Diagrams • • Symbols rule • • Know the terms Saturday, December 7, 13 US Style, IEC style, stuff people make up style Identify the electron flow
  20. 20. LEDs Saturday, December 7, 13
  21. 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 Saturday, December 7, 13
  22. 22. Diagrams What’s going on here? Saturday, December 7, 13
  23. 23. SERVOS Saturday, December 7, 13
  24. 24. SERVOS • • • Saturday, December 7, 13 Black GND RED +5v Yellow PWM Signal
  25. 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 • Saturday, December 7, 13 Pulse Width Modulation LEDS brightness is affected Voltage switches between 0v and Vin
  26. 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. 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 Saturday, December 7, 13 Pins are Numbered Counter Clockwise
  28. 28. 555 Timer Saturday, December 7, 13
  29. 29. DATA SHEETS Read Them Saturday, December 7, 13
  30. 30. 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
  31. 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 Saturday, December 7, 13 http://electronicsclub.info/ circuitsymbols.htm
  32. 32. INSTRUCTABOTS.COM SHARE YOUR ROBOT’S CODE, PARTS AND STORY Saturday, December 7, 13
  33. 33. Meow! INSTRUCTABOTS.COM SHARE YOUR ROBOT’S CODE, PARTS AND STORY Saturday, December 7, 13
  34. 34. Francis Gulotta @reconbot github.com/reconbot rbrtr.com wizarddevelopment.com Saturday, December 7, 13

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