[sdiy] New project idea: probability trakker !?

[ASSI]

On Sunday 22 February 2004 05:00, Bret Truchan wrote:
> This brings up a question.  All of the books I've been reading have
> mentioned that non-volitile ram eventually dies out.  That's pretty
> annoying, isn't it!!!! 

Yes it does that, it's called limited endurance. However for your 
project, I'd suggest using nvSRAM. While it's powered, things are in 
SRAM and can be written as often as you'd like. Things are backed up 
into NV shadow storage when you send a special command or when power is 
removed.

> What's the philosophy in the DIY community
> about components that only last, say, 20 years??  It seems lame to
> me, but I can't think of any way around it.

The other option is to just use a multimedia card (MMC). These cards 
have ECC, wear leveling and self-repair capability and are pretty 
easily accessible as raw storage via an SPI interface. With the current 
prices you could just throw in a 32MByte or even 64MByte card and keep 
on writing past the old entries. It should take a while before you wrap 
around. This has the advantage (or disadvantage?) that all your old 
attempts are easily accessible.


Achim.
-- 
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