micro mini air solenoids
Mark Willis email (remove spam text)
Paul B. Webster VK2BZC wrote:
> Mark Willis wrote:
> > Fun project! Look at the Atmel AT45D081 et al, a megabyte of pretty
> > fast flash RAM, might help you do this...
> Ummm, "flash RAM"? Is this not an oxymoron? Is it serial?
> Paul B.
Yep, serial clock rate of 10 MHz (AT45D081) and now 15 MHz for the
D161's. $10 USD for the D081 part, last I priced 'em. See
for access to various AT45D161 information <G> I'll stay on the D161
There are 2, 528-byte data buffers in the chip (4096 pages of 528
bytes), and only 9 pins total: Vcc, Gnd, !Chip Select, Serial Clock,
Serial Input, Serial Output, !Write Protect, !Reset, Ready/!Busy.
SOIC-28 form factor.
You can connect Serial Input and Serial Output together, I'm told
(Trying it pretty soon on my AT45D081's).
!CS can be hard wired on/off, same for !WP.
!Reset, connect to your PIC's !MClr pin.
Leaves you with 3 active pins and some programming to do - Serial
Clocking, Serial Data, and "Hang on, I'm writing to the chip still" for
a max of 15 (Just page write) or 20 (page erase & write) mSec. I need
to get wired to mine & start coding...
So you can get near 512 bytes, plus some ECC bits, written at around a
40 pages/second rate, I'd guess, i.e. 20 k bytes/second record rate, for
up to 100 seconds (2 Megabytes.) Have to be a really *fast* organ
player to need MIDI data stored at 20 kbytes/second (and you could
parallel several IIRC and use !CS addressing off a shift register or
whatever to address several of these chips, IIRC.)
The 24LC65 is another possibility (those can be paralleled up to 8 on
different addresses easily enough.)
See also: www.piclist.com/techref/io/motors.htm?key=solenoid
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