Not sure what replies you have have already had since the Yahoo interface is acting a bit weird as to showing other messages in the thread.
I usually use the 4-bit version of the LCD interface. Then an E and and RS line are needed. You can tie the R/W line to "write only" usually. So six lines are needed.
I've also been known to multiplex or share lines for multiple purposes. If a line on the LCD is an input and the LCD will ignore it except when it gets a command to readthe data lines, you can use it for other purposes in the same project.
JIm, you might like to look at this project (kit) which sells for about $100 all up with display for inspiration. It can be bought with PC interface only for half that or add the seperate display driven serially. Or, a bluetooth pcb that displays on an Android phone. Schematics are available on the page also.
[having trouble posting it seems]
--- In PHSNA@..., <phsna@...> wrote:
I've been puzzling over how to configure the SSNA so at least it doesn't **prevent** the addition of a display. Better Arduino heads than mine may be needed for advice and counsel here.
I'm going under the presumption that the UNO has 14 digital I/O lines available. The DDS interface uses 4 (D8 - D11 at this time, but that can change).
Most LCD displays (parallel interface) need 8 data lines, an enable, a read/write line, and a clock. That adds up to 15. That may preclude the addition of a parallel display on the UNO. Of course a (more costly) serial LCD would solve that problem. And the serial TX and RX lines are not used by the SSNA.