My question is can I add as 74HC595 shift registry to drive the 8 pins so i can use in total only 7 pins instead of 12 ?
The display will be blinking?
Many other display have a common anode:Is it possible to use 74HC595 also for common anode ?
The display if i well understand has to be common catode ?
Since i still have to buy components, in your opinion the best solution is.. ?
Hi, I made some tests and things seems a bit more clear to me.I'm planning to use 4x7 segmnet display, 4x74HC595 driven by 4 transistors + resistors. I should be able to use only 3+4=7 pins.But now i have one doubt: at the same time it might happen that 32 leds are on, since i'm not multiplexing. Isn't it too much for arduino ? It's necessary to use external power supply ? (considering also that my final project needs 20x7 segmnent display)Thank you a lot!
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