Difference between revisions of "GGHC Schematics"

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(Updated the schematic to include the USB port and the mode up/down pushbutton)
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==The teacher's unit:==
 
==The teacher's unit:==
 
Some key features of the schematic:
 
Some key features of the schematic:
*Uses internal RC oscillator for microcontroller
+
*Uses crystal oscillator for microcontroller
 
*LEDs for answers are driven by input switches, not microcontroller (required to save output pins)
 
*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
 
*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
 
*7-segment display anodes are driven by timer compare outputs for multiplexing without software
 +
*Mini-USB port with level-matching components

Revision as of 22:21, 15 April 2011

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

Student Schematic

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)













Teacher Schematic

The teacher's unit:

Some key features of the schematic:

  • Uses crystal 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
  • Mini-USB port with level-matching components