this one:
How many 4794 chips could the Arduino board handle?
Does the 4794 support 8 LEDs?
Thanks
this one:
How many 4794 chips could the Arduino board handle?
Does the 4794 support 8 LEDs?
Thanks
Hej,
the 4794 can handle 8 simultaneous outputs, but you can daisy chain it and add more chips in series. We have a project here now with 64 double-coloured LEDs at once.
On the other hand, there is another LED driver, from Maxim, the 7219 that handles 64 LEDs at once, but that is more complicated to wire.
/David
Thats very interesting indeed. Do you know anywhere online to buy this chip?
Do you have any documentation online about how to daisy chain it?
I have a 7219 that I am using for an LED matrix, although just starting.
http://www.flickr.com/photos/pixelsumo/68040275/
Chris
Hej,
If you are in Englad, you could get it from http://www.elfa.se , they sell over the net and accept credit card. Also Farnell and Digikey may have it, but I haven't searched there.
The datasheet is available in our web repository:
http://webzone.k3.mah.se/projects/arduino-workshop/upload/default.asp?folder=28
/David
Hi David,
is there a more generic name for the 4794??
i'm trying to find an equivalent chip from RS (as I have an account with them) (http://rswww.com) but when i search for led drivers, i don't find the right sort of chip
Is it a multiplexer?? or ...???
Thanks a lot
Jonathan
Hej,
the proper name for this component is actually: 8-stage shift-and-store register LED driver, HEF4794B. But in a superficial search through your provider's website I couldn't find it.
However there are some alternatives you should be able of using any other LED drivers, or shift registers.
/David
Hej again,
actually the:
8-digit LED display driver,MAX7219CNG
RS Stock no: 311-473
will be able of driving up to 64 LEDs with one single resistor
This one will make the magic for you,
/David
Thats great!
i'll report on my experience of using the chip!
Thank You!
Jonathan
or you can get one of these for testing:
http://www.nexusmachines.com/Products/displays/bxxcdm.htm
they are slightly expensive but good.
cheers
boppyer:-)