Is it possible to connect 8 4-digit 7vsegment displays to any arduino. And how?
Thank you
Yes, with a big power supply.
Yes, you could use four MAX7219 chips in a daisy chain. Using 3 SPI pins and an optional RESET.
You will always need some external electronics. No AVR can manage 224 segments worth of current.
David.
What about those long 7-segment bars. What are they called and do they need any hard stuff?
Sorry about my english.
Thank you
Viliiz:
What about those long 7-segment bars. What are they called and do they need any hard stuff?
Yes indeed, what about them?
I have never seen them advertised and cannot locate them on eBay.
And they are green!
These - 8 digits, red - are readily available,
OK, more search.
They were available on Aliexpress, and a red one from DX.
Sorry about all of these dumb questions but how there is only four cables in the 16 digit bar?
I would guess that the 5th terminal is for cascading another 16 digit module.
The Aliexpress advert imply that it uses a TM1640 chip. Buy a module and find out for yourself.
The DX advert says that it is out of stock.
There are other modules that you can link together. They all work by sending commands through a shift register. Conveniently done with the SPI hardware.
David.