I am using seven segment in my project and i was using common cathode and using npn transistor i was able to switch by making arduino pin HIGH.

But now i want to display the data on seven segment when i make the pin as LOW. I mean i want to select the Segment when i will make it LOW.

i was planning to use PNP transisor but for that i will have to change the seven segment to common Anode.

I want to keep common cathode seven segment and want select when i make it LOW.

 

hi ep,
Do you mean like this.?
E

 

i want to display the data on seven segment when i make the pin as LOW.

Why?

The pin is an output pin from a microcontroller. You can program it to be either logic polarity at any time. Things are working now, so why do you want to change?

ak