## Monday, August 27, 2018

### Lecture Notes 27Aug18

Physical Computing

• Artist who like to use microcomputers/controllers to create media
Electronics is Sculpture

• Materials share electrons
• Two types of electricity- DC- direct current (one direction) - AC- alternating current
• Electrons move from atom to atom-charges rippling along a route (wire) a current
• Conductors/insulators (metallics)- electrons induce friction as they move along.  all materials have resistance.  it can be low to high depending on the atoms in the material. Conductors have lower resistances, insulators have high resistances
• 6.25x10 to 18 per second
• 1 Amp of current
• Conductors: silver, copper, gold, aluminum, iron, steel, brass, bronze, mercury, graphite, dirty water, concrete
• Insulators: glass, rubber, oil, asphalt, fiberglass, porcelain, ceramic quart, (dry) cotton, (dry) , (dry) wood, plastic, air, diamond
• Resistance is less in a thicker wire.  Thicker the wire more amps it can handle.

• Resistance is usually around .01 ohms.
• 1=V/R
• ?=9/.01= 900 Amps
• Amperage, resistance and voltage have a relationship- Ohms Law
• Never correct ground to power directly

• the lesson is that you never want to connect power directly to ground
• there should always be a 'load' on the circuit.
• Conduction junction!
• So the water analogy is helpful because it helps us understand/visualize conduction of electrons through a wire.
• In order to build circuits you will need to be able to read a circuit diagram.
Components:
• components used to constructively push electricity to do work
• complex organizations to control resistance, currents
• General types of components
• two types of components: through hole or surface mount technology
• through-hole vs. surface mount
• Data sheets: every component has a data sheet.
Battery:
• batteries are a store of electrical portential
• supply Direct Current DC
• Come in a variety of voltages (V) and capacities known as Ampere-Hours(AH)
• Battery Schematics
• Supply and ground schematics
Switches:
• a connection of two points
• Open-off position, contacts not conducting
• Closed-on position, contacts conducting, there may be several on positions
Resistors:
• control currents (see Ohm's Law)
• measured in Ohms
• Use omega as symbol Ω
• Common values and multipliers.  Kiloohm (thousands) kΩ megaohm (millions) MΩ
• ㏀㏁
• Resistors app calculator
Capacitors:
• Capacitors (caps) come in variety of forms and materials
• caps store an amount of electrical potential to provide a boost current, deliver a large burst of energy
• if you ever need to handle a larger cap you can discharge it using a tool with an insulated handle such as a screwdriver.
• carefully lay the conductive section across the two poles making sure your hands are not touching the surface.
LED's
• Light emitting Diodes
IC's
• Integrated Circuits
• Legs have specific jobs. Find info on data sheets
• Comes in varied sizes

The EyeWriter
• Eye tracking software
Text Rain
• projection of letters
• Camille Utterback
PigeonBlog

Zap Away
• Antirape bra