Wednesday, August 29, 2018

Simple LED Circuit Tutorial
Connect your battery terminal to the appropriate power rails.

Place one end of your resistor into any of the rows, and the other end into another row. The run a wire from the positive power rail to the same row as one end of your resistor.

Place the anode of your LED into the same row as the opposite end of the resistor from where you connected the power. Then place the cathode into an empty row. 

Connect the row containing the cathode of your LED to the negative power rail.

Connect your battery!

DAY 2 NOTES 8/29/18

Current moves from high potential to low potential

Circuit Diagram Symbols
Image result for circuit diagram symbol chart

Open Circuit - The loop is not closed, the circuit is not flowing.
Short Circuit - The power connects directly to ground.

XKCD <------ Great web comic

-Sandbox for circuit experimentation
-The holes in each row connect to one another, but the break in the middle separates each row.
-The holes in the columns on the side are called Power Rails and are connected all the way down, one column being our power source (positive +, usually coded red) and one column is the ground (negative -, usually coded black)

-Free electronic design software that allows you to design circuits both visually and schematically.
-You can even have circuits you've designed printed.

-Red/Yellow/Green are typically 3v and 20milliAmps
-All diodes are polar and control the direction of the current.

Monday, August 27, 2018

DAY 1 Notes 8/27/18

DAY 1 NOTES 8/27/18

2 types of current

  • Direct Current (DC) - Moves one direction
  • Alternating current (AC) - Alternates directions
Movement of electrons is a current.
All materials have resistance - friction as electrons move along.
Insulator- High resistance material (plastics, rubber, etc)
Conductors- Low resistance material (metals)

1 Amp of current - 6.25x10^18 per second
Resistance is lower in a thicker wire because theres more material to move along (ex. a wire pipe will move more water)
I(Amps)=V(Voltage)/R(Resistance) <-----Ohm's Law

Power never connects directly to ground.
There should always be a load on the circuit.

Circuit- A system that uses electricity to do some type of work.
Circuit Diagrams are also known as a Schematic.

Components - common part, manipulate current to do work.
Two common types:
  • Through hole(PHT)- older, uses legs that pass through holes
  • Surface Mount(SMT)- sit directly on the board.
Every component that is manufactured has a data sheet where you can view all the pertinent info for voltage, resistance, etc.

-a store of electrical potential
-supply DC
- come in a variety of voltages(V) and capacities known as Ampere-Hours(Ah)

-connect a section of circuit
-typical application is to connect the power
  • open- off position, not conducting
  • closed- on position, conducting
  • terms on data sheets are "normally open" (NO) and "Normally closed" (NC)
-controls currents
-common shape is a barrel with stripes denoting value of the resistor.
-measured in Ohms.
-use Omegas as symbol.
-common values/multipliers:
  • Kiloohm (thousands)
  • Megaohm (millions)
-There are apps to calculate the value of your resistor.

-common values:
  • picoFarads (trillionths)
  • nanoFarads (billionths)
  • microFarads (millionths)
-Light Emitting Diodes
-they have two polar legs:
  • Anode (positive)-longer leg, inside flag is smaller
  • Cathode (negative)-typically shorter leg, flag inside is larger
-integrated circuits
-typically two rows of legs, sometimes one row.
-kinda works like a lego brick, is a "process" that is commonly used enough to be packaged and utilized as a single component.
-each leg does a specific job, these are specified on the data sheet
-come in many different sizes.

Examples of Physical Computing projects:

  • EyeWriter
-used eye tracker to move a cursor around a field.
-made with a pair of glasses
-developed to assist a graffiti artist with ALS who could no longer move.

  • Text Rain
-people moving between a projection on the wall and a camera affect the movement of falling text on the projection.

  • Beatriz DaCosta's Pigeon Blog
-pidgeons wearing small sensors fly from a distant location to home, collecting information about air quality along the way.

  • Zap Away
-Anti-rape bra that zaps would-be assailants.

  • Mic Jammer
-emits an ultrasonic frequency that jams microphone recordings.

  • Touchy