One of 33 LED output Indicator

[HenrikOlsson]

Shiftregisters are probaby the easiest/quickest way. There are dedicated constant current LED driver chips with serial input available (like the classic MAX7219 or perhaps TLC59282 (just one that I found now)). Or you might want to look into Charlieplexing. I think you might have just enough pins on the '628 to do it.

Sidenote: For 7 bits the range i 0-127, not 0-128.

/Henrik.

[Mike, K8LH]

I agree with Henrik. You could Charlieplex 30 LEDs using six pins or up to 42 LEDs using seven pins. Or add a 74HC595 or a driver IC and multiplex the LEDs. Here's a multiplexed example for 32 LEDs that only requires five pins using my MacMux interface method (below).

Happy Holidays and cheerful regards, Mike

[SOTASOTA]

Thanks for all your replies!! I think my best bet is a serial programmable chip like the MAX7219 or even the AMS AS1116 (http://www.ams.com/eng/Products/Ligh...ver-ICs/AS1116)

The AMS AS1116 is much less expensive than the MAX7219/7221.

OK, now I have never programmed these types of IC's. These ICs use an "SPI" interface?

Any coding examples for this for turning ON/OFF any one of the 64 LEDs?

Thanks!!
Russ

[mackrackit]

You could go old school
http://www.picbasic.co.uk/forum/show...ght=smart+star

[SOTASOTA]

I know zip about using ShiftOut and cascading 74HC595 shift registers. I do not understand how to program a cascaded 74HC595's.
Even looking at that code:
http://www.picbasic.co.uk/forum/show...ght=smart+star
I do not really understand what is going on line-by-line.

Any primers or tutorials on this?? I think using 74HC595 shift registersn would solve my issues.
Help!
Thanks!!