GGHC Schematics
(Difference between revisions)
Surferdudemi (Talk | contribs) (Updated the schematic to include the USB port and the mode up/down pushbutton) |
Surferdudemi (Talk | contribs) (Updated key features to match new schematic.) |
||
| Line 4: | Line 4: | ||
==The student unit:== | ==The student unit:== | ||
Some key features of the schematic: | Some key features of the schematic: | ||
| − | *Uses | + | *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 | *7-segment display anodes are driven by timer compare outputs for multiplexing without software | ||
| − | * | + | *Mini-USB port with level-matching components |
<br /> | <br /> | ||
<br /> | <br /> | ||
| Line 20: | Line 22: | ||
<br /> | <br /> | ||
[[File:TeacherSchematic.png|600px|thumb|left|Teacher Schematic]] | [[File:TeacherSchematic.png|600px|thumb|left|Teacher Schematic]] | ||
| + | |||
==The teacher's unit:== | ==The teacher's unit:== | ||
Some key features of the schematic: | Some key features of the schematic: | ||
Revision as of 15:49, 17 April 2011
Here are the latest versions of the schematics for the devices we plan to make as part of the GGHC:
The student 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
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
