raumfahrtagentur.org coretime
by raumfahrtagentur, published
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Description
this is a digital 7 segment led wall clock with 42mm high digits based on a atmel atmega168.
the display modules come from RFT, a former manufacturer in the GDR(DDR). (second hand)
the display modules come from RFT, a former manufacturer in the GDR(DDR). (second hand)
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Instructions
the atmega uses a 12mhz crystal.
ULN2003 is used as low-side driver.
a 2-stage bipolar transistor driver is used for the high sides for the digits (common anode)
note: you will need to laser the top-left part in wanduhr_holders.dxf twice.
source, schematic and more pictures on m21.hyte.de/wiki/Projekte/Wanduhr
ULN2003 is used as low-side driver.
a 2-stage bipolar transistor driver is used for the high sides for the digits (common anode)
note: you will need to laser the top-left part in wanduhr_holders.dxf twice.
source, schematic and more pictures on m21.hyte.de/wiki/Projekte/Wanduhr
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(54 kb zip file)
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