Re: Re: [sdiy] My first big project

[Roman]

With a series of 74HC595/597 you can have unlimited number of inputs an outputs for LEDs, buttons etc, anything not too critical on timing. HC595 is paralel out/serial in, and HC597 is serial out, paralel in (or was it the other way? correct me if I'm wrong). They are so much alike, you can almost interchange. Connect them all in ring daisy chain, with just 2 jumpers configure PCB to accept 595 or 597, and you're done - controlling unlimited number of I/O with just 4 uC pins: serial clock, latch, data in, data out.
Thanks to Batz for pointing me to those chips.

Just my 3gr, or maybe 2 euro-cents in a couple of years ;)
OTOH it's actually less than 1 cent...

Roman

---- Wiadomość Oryginalna ----
Od: David Brännvall <david at brannvall.net>
Do: synth-diy at dropmix.xs4all.nl
Data: Mon, 12 May 2003 17:58:21 +0200
Temat: Re: [sdiy] My first big project

(snip)

>Mmm bankswitching ofcourse, you make everything sound so simple! This
>74HC138 seems great, TTL level right? I should be able to handle that,
>though I feel a bit lost in this wonderful new territory of hardware.
>
>I could use this 74HC138 thingy to get lots of buttons on a few pins to!
>Same thing for leds, with some extra d-latch or something, I think I will
>work that out.
>