Connect 4xSeven segment displays with MAX7219

Trying to hook up 4x seven segment displays with a MAX7219.

using this diagram:

do i just connect all displays a,b,c,d,e,f,g in parallel to the sega,segb etc. ?

and what's the RSet value going to be?

Hi,

do i just connect all displays a,b,c,d,e,f,g in parallel to the sega,segb etc. ?

Yes.

and what's the RSet value going to be?

Explained here: http://www.arduino.cc/playground/Main/MAX72XXHardware#SelectRSet

If you have a partnumber or a link to the datasheet of the 7-seg displays I could have a look.

Eberhard

Thank you Eberhard.

Can the Din, Clk and load (cs) go into any Arduino I/O pin......and more importently, what the hell do they mean?

Is there any sample code for running 4 segment displays?

Hi,

Can the Din, Clk and load (cs) go into any Arduino I/O pin

Depends on the software you are going to write. Using a library like this one http://www.arduino.cc/playground/Main/LedControl should make it easier to get started. There is also a small demo for 7-seg displays using the library.

There are even more articles here http://www.arduino.cc/playground/Main/LEDMatrix but I don't know if there are any 7-segment examples.

......and more importently, what the hell do they mean?

They are the the signals needed for a bus concept called Serial Peripheral Interface here is a short article explaining the basics http://www.mct.net/faq/spi.html

Eberhard

thank you wayoda, they were very useful links

Got it all built and running sample code fine, but am having trouble with writing code to make it do what iv built it for.

If anyone can help out http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1250107447 :-*

Hate to bring raise this thread from the grave, but I'm wondering what C2 is for in the diagram.

power supply decoupling. a source of local power for when the chip needs a little extra locally stored "oomph" for the digits.