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cplatt
09-20-2008, 07:17 AM
Sorry, I am a real novice but have had a great time with the stamp projects that I have tackled. Now what I need to do is to control around two dozen 7-segment led displays. Is this feasible with a stamp or does anyone have a better way of doing this?

Thank you!
curtis

Mike Green
09-20-2008, 07:35 AM
It's doable using external components, but you may do better with a specialized 7-segment driver controlled by a Stamp. Maxim makes several (search their website ... they have several 8 digit drivers and you could have 3 or 4 of them).

If you want to control them directly, you could use a shift register / driver like the ULN2803 drive the low side (depending on whether they're common anode or common cathode LEDs) and discrete PNP transistors to drive the high side from a shift register like the 74HC595.