Difference between revisions of "SeriAlpha"
From Hackstrich
(Documenting rev1 bugs.) |
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* Built in character generator, so you can just tell the board what letter/number to display. | * Built in character generator, so you can just tell the board what letter/number to display. | ||
* Targeting the [http://www.sparkfun.com/commerce/product_info.php?products_id=9934 SparkFun-sold 16segment LED displays] | * Targeting the [http://www.sparkfun.com/commerce/product_info.php?products_id=9934 SparkFun-sold 16segment LED displays] | ||
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| + | == Revision 1 Design Issues== | ||
| + | * <s>Unable to disable RESET pin due to silicon errata, so one segment won't work.</s> - Fixed by switching to ATmega48 in revision 2. | ||
| + | * <s>No bypass caps on PCB</s> - Fixed in revision 2. | ||
| + | * <s>Board could be smaller if MCU moved to bottom of board</s> - Fixed in revision 2. | ||
| + | * <s>Resistor networks and dual-transistors would make assembly much easier</s> - Fixed in revision 2. | ||
[[Category:Current Projects]] | [[Category:Current Projects]] | ||
Revision as of 18:13, 2 October 2010
SeriAlpha is a small backpack for alphanumeric LEDs (16 segment, specifically). It will accept I2C/SPI communications, and control the LED display attached to it.
Project Status
Schematic/board done, BOM on file at Digikey, board and parts have been ordered and have arrived.
Design Overview/Ideas
- Based around the ATtiny2313 in a QFN20 package
- Individual transistors for each segment, so it will support all segments on at once and nifty things like PWMing segments
- Built in character generator, so you can just tell the board what letter/number to display.
- Targeting the SparkFun-sold 16segment LED displays
Revision 1 Design Issues
Unable to disable RESET pin due to silicon errata, so one segment won't work.- Fixed by switching to ATmega48 in revision 2.No bypass caps on PCB- Fixed in revision 2.Board could be smaller if MCU moved to bottom of board- Fixed in revision 2.Resistor networks and dual-transistors would make assembly much easier- Fixed in revision 2.
