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4 digit 7Segment Multiplexing using 8051F330

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moohoo123

New Member
Hi!
I am currently working on an assignment using 4 thumbwheels to control 4 7 Segments. However, to reduce the number of I/O pins used, i will have to multiplex the 7 segments(Common Cathode).

I am unsure of the codes to used to control each segment. Anyone have any guidelines for me?

Currently using C only.

Thanks
 

Gayan Soyza

Active Member
That is for common anode not for common cathode.

For common cathodes driver transistor (NPN) is need for each display common pin & the data is supplying the possitive path from the micro controller side.Each driver transistor must turn on one at a time & the correct binary pattern must move to the correct place (segment) of each drive transistors position.
 
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srikanthsamaga

New Member
But working principle is same for both common cathode and anode, the only difference is that the output data should be complimented and transistors should be changed.
 
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