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 Posted: Feb 23, 2012 - 10:27 PM |
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Joined: Apr 07, 2011
Posts: 38
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My USB tutorial is hitting 2000 views soon so I thought I'd write a new one on multipexing seven segment displays. The information on the net, while readily available, is pretty fragmented and most only cover one part of the whole (principles, schematic or code sample), so I thought I'd cover it all in easy, step-by-step manner:
http://codeandlife.com/2012/02/24/7-seg ... ansistors/
Quite many setups in the net used a 74HC595 shift register for the segments and NPN transistors for common cathodes. However, that shift register has 35mA maximum output and 500 mW maximum power dissipation, which means once you have more than two or three displays, things start to get iffy. I therefore chose to use ULN2003 darlington array to drive the segments - a 595 could be added in front of that to reduce the amount of MCU pins needed.
Update: I attached a PDF version of the tutorial just in case my blog ever goes under. It's not as pleasant to read due to paging, so I still recommend the link above.  |
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Last edited by jokkebk on Feb 24, 2012 - 09:30 AM; edited 1 time in total
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Posted: Feb 24, 2012 - 09:16 AM |
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Joined: Jul 18, 2005
Posts: 62303
Location: (using avr-gcc in) Finchingfield, Essex, England
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| Is it possible to post a permanent copy here? Too often URL links go dead after 2 or 3 years. |
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Posted: Feb 24, 2012 - 09:33 AM |
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Joined: Apr 07, 2011
Posts: 38
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clawson wrote:
Is it possible to post a permanent copy here? Too often URL links go dead after 2 or 3 years.
Good idea. I added that to the tutorial. I'm not anticipating the site going under for a few more years, but you are right, one never knows what'll happen in the future! |
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