- ... The matrix is the problem. For outputs, it does not allow unlimited combinatons for individual outputs. For inputs, it looks neat.Message 1 of 53 , Jun 2, 2004View Source--- In Electronics_101@yahoogroups.com, "Steve" <alienrelics@y...> wrote:
> --- In Electronics_101@yahoogroups.com, "leon_heller"The matrix is the problem. For outputs, it does not allow unlimited
> <leon.heller@d...> wrote:
> > You could use four '595s in series. You will have to send a 32-bit
> > word each time, even if you only want to change a couple of the
> > outputs. The outputs are latched, so relays you want to stay on won't
> > drop out whilst you are updating other outputs. You'd only need four
> > outputs from the MCU, IIRC.
> Max7219 can be used as an 8 LED 7 seg decoder/driver/latch, or as a 64
> output shift register/driver/latch. 3 wire serial input.
> It scans the 64 outputs as an 8x8 matrix, so keep that in mind. IE, it
> does not have 64 individual physical outputs.
combinatons for individual outputs.
For inputs, it looks neat.
> Alien Steve
- ... That s what I thought. :-) ... Someone else posted a link to the part that I saw after I posted that reply. If you can t find data on it, let me know andMessage 53 of 53 , Jun 6, 2004View SourceOn Saturday 05 June 2004 08:16 pm, Anthony Toft wrote:
> > When asking for (or looking for) assistance in identifying parts, it'sThat's what I thought. :-)
> > probably a good idea to say what it looks like! As in, what kind of a
> > package it's in...
> Sorry, 14 pin Dip.
> > you have there is a "quad" transistor, and I can probably dig some moreSomeone else posted a link to the part that I saw after I posted that reply.
> > info on it out of an old data book or something...
> Ooh, I hope they (I got 29 of them) are quad transistors, I will have to
> think of some cool stuff to do with them!
If you can't find data on it, let me know and I'll do some digging...