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Home › Magazines › 2009 › July/August › Six-digit Display with SPI Port

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Six-digit Display with SPI Port

Published in issue 391, July/August 2009

The Maxim MAX7219 is controlled over an SPI port, requiring just four I/O pins on the microcontroller. It can drive up to eight individual seven-segment displays. Contrary to popular belief, multiplexing the displays does not reduce overall power consumption: although each digit is only driven briefly the LED current must be correspondingly increased in order to achieve the same average brightness.

Extra info, Updates

Components

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Characteristics

* six-digit seven-segment display
* just two components, plus display modules
* driven using software SPI emulation
* C driver routines easily adapted to any type of microcontroller

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Magazine July/August 2009
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Software

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Supplement (details) Tiny Brick and Tiny Digit

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Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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