Circuit Design Diagram

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Circuit Design Diagram
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How it works
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What we constructed
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Slide info

• Purpose to test a control system for a n x m
  array of heating elements
• High current
• Fast switching time
• Must be scalable and inexpensive
• Process utilized a row-column control system
  (see schematic slides)
• Results the designed system satisifies our
  requirements (put pics or something)

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Process (explaining how it works)

• Columns are tied to ground by the solid-state
  relays
• Rows are tied to 120V-AC by the solid state
  relays
• Control signals from a microcontroller are
  amplified and fed to the relays
• Light bulbs were used instead of coils because
  they are same wattage and much safer.
• By switching on a row and column pair, a single
  light can be turned on
• Ex turning on row 0 and column 0 will turn on
  light (0,0)
• By rapidly switching between multiple row and
  columns many cells can be turned on and power
  output can be controlled by time-averaging the on
  signals (like a PWM)

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Cost Estimate

• 15 x 10 rows 25 relays _at_ 10 per relay -gt 250
• Orc microcontroller 300
• Computer 600
• Wiring and connectors 30
• Total 1680
• Applying 10 rule 168
• Using a task-appropriate microcontroller and
  computer 90