Difference between revisions of "GGHC Schematics"

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(The student unit:)
(The teacher's unit:)
Line 22: Line 22:
 
==The teacher's unit:==
 
==The teacher's unit:==
 
Some key features of the schematic:
 
Some key features of the schematic:
*Uses crystal oscillator for microcontroller
+
*7-segment displays are driven by shift registers
*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
+

Revision as of 20:30, 3 May 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:

  • LEDs for answers are optional: the switches can be used alone as inputs
  • 7-segment display driven by shift register













Student Schematic

The teacher's unit:

Some key features of the schematic:

  • 7-segment displays are driven by shift registers