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7segment display multiplexing

P

petrus bitbyter

Jan 1, 1970
0
Jack// ani said:
Hi all,

I want to multiplex two seven segment display with a single control
line!! Here is a schematic
http://www.mikroelektronika.co.yu/english/product/books/PICbook/7_chapter/29.gif
which do so with two control lines...but my trouble here is I've only
one I/O line left free......

Thanks

Connect the base resistor of T2 to the collector of T1. Then one and only
one of the digits will always be "activated." You will off course have to
adapt the program code. Guess you'd best switch off all segments before
changing digit.

petrus bitbyter
 
B

BrunoG

Jan 1, 1970
0
Hi all,
I want to multiplex two seven segment display with a single control
line!! Here is a schematic
http://www.mikroelektronika.co.yu/english/product/books/PICbook/7_chapter/29.gif
which do so with two control lines...but my trouble here is I've only
one I/O line left free......

Thanks

Hi, use a npn for T1 and a pnp for T2, both bases on the same control line ?
only one display at a time will be powered


Bruno
http://www.micro-examples.com/public/microex-navig/doc/200-pic-microcontroller-examples.html
 
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