Difference between revisions of "GGHC Schematics"

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*(schematic needs to be revised with improvements / corrections from teacher unit design)
 
*(schematic needs to be revised with improvements / corrections from teacher unit design)
  
 
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[[File:TeacherSchematic.png|600px|thumb|left|alt text]]
 
[[File:TeacherSchematic.png|600px|thumb|left|alt text]]
 
==The teacher's unit:==
 
==The teacher's unit:==

Revision as of 22:11, 14 April 2011

Here are the latest versions of the schematics for the devices we plan to make as part of the GGHC:

alt text

The student unit:

Some key features of the schematic:

  • Uses internal RC oscillator for microcontroller
  • 7-segment display anodes are driven by timer compare outputs for multiplexing without software
  • (schematic needs to be revised with improvements / corrections from teacher unit design)

alt text

The teacher's unit:

Some key features of the schematic:

  • Uses internal RC oscillator for microcontroller
  • LEDs for answers are driven by input switches, not microcontroller (required to save output pins)
  • LEDs for answers are optional: the switches can be used alone as inputs
  • 7-segment display anodes are driven by timer compare outputs for multiplexing without software