7 segment display Pin outs?

[Kaellis991]

So if what I have wont work, what do you suggest for the driver?

[Ralph]

You can directly drive them from an Arduino, you don't need any special chip.

[Kaellis991]

Never heard of that...back to the research again.

[Kaellis991]

This siminnovations wiki tutorial, is the only one I see for connecting 7 segment displays.
Why does it refer to the max7219?

I am getting thoroughly confused.....

[Ralph]

https://siminnovations.com/wiki/index.p ... #8_Segment

[Kaellis991]

The .3 inch displays I have are not 8 segments.

[Ralph]

They have a dot, so they are 8 segment. But 7 or 8, doesn't matter.

[SimPassion]

The .3 inch displays I have are not 8 segments.

We call them mostly 7 segment, but it's correct to say 8 segments while including the decimal point "." we can see as a segment purely electronic LEDs display speaking, so no issue with the provided advice from Ralph and indeed the following will work :

Notice the whole page provide samples for different parts which will be addressed using Air Manager "hw_chr_display_add" statement, this is why they all fit on the same page, as well as the MAX7219 sample
 

[Kaellis991]

So the diagram that Ralph posted shows how to wire (2) 3-digit displays to an Arduino?

[jph]

Under no circumstances connect more than 1 x 7 segment display digit directly to an arduino without a high or low side driver transistor depending on CA or CC. That would be 1 transistor per digit, 1 base resistor and 1 current limit resistor per digit load transistor. So, no, you cannot use an arduino directly, you would have to use npn transistors. 1 per digit, or you could use a ULN Darlington array, but why bother when you have already bought a driver ic?.
You could, in theory, use 32 pins of a mega in a non mux arrangement for a 4 digit example but you would be limited to 6mA per led without overloading the mega. Direct drive, even muliplexed on a mega without transistors or buffers is a non starter. The device is simply not capable.