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Author Topic: RAM, SDCards, Memory  (Read 680 times)
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i've seen a project that allowed an ATMega chip to use an SD card through serial communication... can the chip also use RAM simms?... i have some old ram lying around and if i can use it, that would be fun... i don't really have any need to do so, just to learn..

thanks,
isaac
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Computer ram usually requires in the order of 200 pins.
Have fun trying to hook it up. smiley-razz

Theoretically its possible but more trouble than what its worth.
Best to get some ram chips designed for micro controllers.
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The problem with typical computer RAM is not the number of pins (which is a huge pain) but the fact that most iof it is DRAM, which requires the contents to be constantly refreshed.

For Microcontroller projects you want SRAM, which doesn't require support hardware to maintain its contents.

One trick to get around the number of pins requirement is to use one or more serial in/parellel out shift registers for the address, and 8 pins for the data.

I have seen data sheets for an 8 pin SPI interfaced SRAM, but it does not appear to be in production, as the only place I found to order it wants several weeks lead time and a minimum order of one spool (2500 units, IIRC).

-j
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oh well, i have some old computer parts lying about that i'm trying to have fun with... a few simms, a pci modem, hard drives, pci 802.b wireless card, web cam (with an mmc card)... i'm not afraid to scavenge for a bit of fun if anyone has ideas...

as for storage - i am planning to build a simple weather station next week and just wanted to sample and average... i've discovered a couple of good sites:

http://www.arduino.cc/playground/Main/UsbMemory
http://jvcideas.blogspot.com/

my main interest at the moment is serial communication... moving parts don't really excite me (yet) smiley..

thanks,
isaac
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as for storage - i am planning to build a simple weather station next week and just wanted to sample and average...
Have you considered EEPROM for your storage needs?

--Phil.
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Have you considered EEPROM for your storage needs?
He doesnt have storage needs. He just wants to hook random stuff together. smiley-wink
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He just wants to hook random stuff together.

LOL I have the same urge smiley-grin

Some memory modules (the 168 pin ones at least) have a serial EEPROM nailed on, ready for the scavenging. If you're confident with an iron, or unconfident but ballsy, then there's a project right there. You only need 4 wires soldered on, and away you go. check:

http://www.dewassoc.com/performance/memory/how_to_ID_memory.htm

look for SERIAL PRESENCE DETECT and have fun!

« Last Edit: November 18, 2007, 03:34:22 pm by sirmorris » Logged

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He doesnt have storage needs. He just wants to hook random stuff together. smiley-wink

how correct you are, sir!... and to add to the list, i've discovered two usb game controllers, and a PS/2 number pad (my wife is an accountant - and she believes me to be quite the nerd) smiley... eeprom is promising, but i've no experience with it... and it appears that using computer ram wholy is out of my league right now, but those that i have are simms for a laptop, which don't seem to have the onboard eeprom ...

i just need to reset and let the rational side of the brain catch up to the creative side!..

thanks,
isaac
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