The World of Electronics Fun Stuff David Johns Univ. of Toronto A - - PowerPoint PPT Presentation

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The World of Electronics Fun Stuff David Johns Univ. of Toronto A - - PowerPoint PPT Presentation

Jun 19, 2023 167 likes •396 views

The World of Electronics Fun Stuff David Johns Univ. of Toronto A great time for fun electronics Internet information is extensive Social media (forums) help problem solving/information gathering Growing Knowledge (video) A

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SLIDE 1

The World of Electronics Fun Stuff

David Johns

  • Univ. of Toronto
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SLIDE 2

A great time for fun electronics

  • Internet information is extensive
  • Social media (forums) help problem

solving/information gathering

  • Growing Knowledge (video)
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SLIDE 3

A great time for fun electronics

  • Low cost (free) software
  • Low cost pcb fabrication
  • Microcontrollers $0.5 to $10
  • Tiny low cost sensors (MEMS)
  • Places to sell electronic gadgets
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SLIDE 4

Some Gadgets

  • Ultimate machine (Claude Shannon)
  • LED floating message
  • LED spinning message
  • LED spinning globe
  • Capacitive touch interface
  • Angry birds robot
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SLIDE 5

Microcontroller

  • A microprocessor with ...
  • flash memory for program
  • RAM for general use
  • general purpose I/O
  • timers with interrupts (including watchdog

timer)

  • SPI, UART, I2C interfaces
  • optional analog (ADC, DAC, voltage ref, etc)
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SLIDE 6

Development Boards

  • Arduino nano
  • Mbed
  • MSP430 Launchpad
  • Raspberry Pi
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SLIDE 7

Arduino Nano - $45

  • Atmel microcontroller
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SLIDE 8

Mbed - $45

  • NXP – arm micro
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SLIDE 9

Launchpad - $5

  • TI – MSP430 16-bit micro
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SLIDE 10

MSP430 Family

  • 16 bit microcontroller
  • $1 to $10
  • Very low power, rapid turn-on
  • FRAM flash available (new)
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SLIDE 11

Raspberry Pi - $50

  • Full computer – Arm based (hdmi output)

(linux)

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SLIDE 12

Buying Electronics

  • Hobby/prototyping
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SLIDE 13

Buying Electronics

  • Serious stores (overnight delivery)
  • Digikey.ca ($8 shipping overnight)
  • Mouser.com
  • Newark.com
  • Jameco.com
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SLIDE 14

PCB Fabrication

  • Typical pcb (ipad)
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SLIDE 15

PCB Fabrication

  • Don't try to make your own pcb
  • Pcb can be ordered for about $100
  • all on-line
  • Sierra protoexpress (protoexpress.com)
  • Advanced Circuits (4pcb.com)
  • CAD tools
  • eagle (low cost)
  • Altium (UofT has unlimited licenses)
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SLIDE 16

PCB Assembly

  • Typical PCB assembly (manufacturing)
  • Solder paste application
  • Pick-and-place machine
  • Reflow solder
  • Typical PCB assembly (prototype)
  • hand solder each device
  • use hot air to remove components or attach

leadless devices

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SLIDE 17

So much SMT these days

  • Can't ignore surface mount technology
  • Can buy breakout boards to help with

prototyping

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SLIDE 18

Breakout boards

  • proto-advantage.com (breakout boards)
  • Surface mount technology to breadboard
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SLIDE 19

Soldering SMT

  • For passive 2 terminal (caps, resistors)
  • use flux on both pads
  • solder 1 pad
  • hold device with tweezer, attach device
  • solder other terminal
  • For quad-flat-pack (QFP)
  • pin corners
  • apply flux
  • drag solder from corners
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SLIDE 20

Component removal

  • Hot air rework station – (Aoyue works well)
  • Can also use it to solder leadless packages
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SLIDE 21

Solder Reflow Profile (lead)

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SLIDE 22

Robotics with Sensors

  • 3d printer (makerbot) - $3,000
  • Rethink Robotics - $20,000