ACM DIY Circuits Project

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ACM DIY Circuits Project
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What are we building?

• The circuits project is built off of the Makezine
  MiniPOV-3 Persistance of Vision kit
• Exposure to components such as resistors, diodes
  (both zener and light-emitting), PCB's, and an
  Atmel attiney2313
• Construction by soldering
• Software programming in C using AVR-dude

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How does a POV work?

• Persistence of vision is a perceptual process
  where your brain holds an image in it's head for
  a moment. Each image that is held is then merged
  into the next image.
• This same phenominon is what allows us to see
  moving people in a movie instead of 24 frames as
  individual pictures
• Our circuits project uses LED's that flash at a
  rapid rate. When we combine this with movement of
  the device, we are able to fool our minds into
  seeing one continuous picture

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Construction of the device

• How does soldering work?
• Soldering is the process of using a filler
  material to join two or more pieces of metal.
  This process occurs at between 400 and 800
  degrees fahrenheit, depending on the materials
  and their size
• The filler material (solder) is typically 60 tin
  and 40 lead. This combination is used because
  of its conductivity and low melting point
• Tools Needed
• a soldering iron
• solder
• cleaning sponge / rag
• clippers to remove excess length from leads and
  plyers to hold parts in place
• solder wick incase you need to remove a part
• safety glasses
• a well ventilted area

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How To Solder

• Soldering is actually very easy...if you follow
  the steps below
• First, make sure your iron is up to temperature.
  This is typically done by simply allowing the
  iron to sit plugged in for around 5 minutes
• Next, holding the iron in one hand and a small
  piece of solder in the other, apply heat to the
  desired surfaces
• Allow the surfaces to heat up for around 5
  seconds (again this depends on the materials you
  are soldering!!)?
• Now, with the heat still applied, apply a small
  amount of solder.
• Remove the solder, then the heat
• Allow to cool, check for a good connection

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Programming the device

• AVR-Dude works in Windows, Linux, and MacOS
• Our Mini-POV's communicate over the serial bus
• Software installation information can be found in
  the links at the end of the presentation

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Sample Code

• The source code is contained within the firmware
  available within the links page

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AVR Program Screen
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Useful Programs and Links

• WinAVR http//sourceforge.net/projects/winavr/
• MiniPOV Source
• http//www.ladyada.net/media/minipov3/minipovfirmw
  are.zip
• Simplified Programming Tools
• http//www.magicsoftinc.com/MiniPOV.exe
• Instructions
• http//www.ladyada.net/make/minipov3/programming.h
  tml

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Questions?