Using a shift register to power a 7 segment display

Husker

I have trying to use a shift register to run a 7 segment display because I heard it can cut down the number of I/O pins needed. However, I have tried and tried to get it to work with little success. Schematics online have been of little help because they are in too complex of a circuit. The only things I have figured out is hooking up ground, Vcc, and Qa-Qd for the register. I am trying to find a simple schematic to hook these two up.

I attached the data sheets for both components. I have a 74195 register and a LSD5061-11 7 CA segment display. Thanks for any help!

PJAllen

The 74195 isn't the sort of shift register that you can use in this instance.· What you're looking for is a "serial in, parallel out" sort, like a 74HC595

http://www.parallax.com/Store/Microcontrollers/BASICStampModules/tabid/134/txtSearch/74hc595/List/1/ProductID/229/Default.aspx?SortField=ProductName%2cProductName

or a 74HC164·http://www.jameco.com/Jameco/Products/ProdDS/49681.pdf

Post Edit:

In this article -- http://www.parallax.com/dl/docs/books/sw/exp/sw23a.pdf

a '595 is used.· It utilizes a common-cathode display.· For a common-anode, the common-anode should go to +5V and the program must be modified to use "0" = LED on (Ground True.)




Post Edited (PJ Allen) : 12/11/2007 2:54:47 AM GMT