I am in the startup making a datalogger.
I'll use a ADS8320, 16 bits serial a/d and a pic (16c84).
I wonder if it is possible to use a RAM from a pc
or at least a larger ram that can keep the data until
it is downloaded to a pc.
thanks for any help
Ernst
At 01:15 PM 09/23/2000 , you wrote:
>I am in the startup making a datalogger.
>I'll use a ADS8320, 16 bits serial a/d and a pic (16c84).
>I wonder if it is possible to use a RAM from a pc
>or at least a larger ram that can keep the data until
>it is downloaded to a pc.
>thanks for any help
>Ernst
>
I am looking to do this as well. I have not come across any such docs to
use PC Ram as of yet, but I think that ram has to be refreshed unless that
aspect has changed from my knowledge of the subject.
Several people have mentioned SanDisk and another company that produces
those flash memory cards for digital cameras. Some of them can hold 390MB
of info.
Everyday Practical Electronics, October 2000.
Have a project for a dual channel virtual scope using a PIC16F877.
TC55257DPL85L. and a MAX492 op.amp
The TC55257 ram chip I think could be changed for a more common 32k static
ram i.e..HY62256 this as not been tried.
There is a URL http://www.epemag.wimborne.co.uk with a link for the code for
the 16F877 basically the data line to port rd0-7
address line to ports rb0-7 and rc0-7 output to PC via port rc.
and data input to ra0-ra1
Ernst Aardal wrote:
>I am in the startup making a datalogger.
>I'll use a ADS8320, 16 bits serial a/d and a pic (16c84).
>I wonder if it is possible to use a RAM from a pc
>or at least a larger ram that can keep the data until
>it is downloaded to a pc.
>thanks for any help
Yes, of course you can use a RAM chip to store data temporarily.
"static" SRAM is much easier to interface than "dynamic" DRAM
for a small controller. Also, you can use a serial EEPROM chip
for more permanent storage, like 24Cxx series from Microchip
and others.
The biggest problem with interfacing std SRAM chips to a PIC
is the number of address and data lines you need to deal with,
at least 22-26. An 18-pin '84 is not an ideal choice. Because of
this, I recently designed my own PIC controller board with SRAM
chip, for usw with 40-pin 16C74 or similar pinout:
I have a similar requirement and am investigating using Sony Memory Stick
technology. I need LOTS of memory, so their 64 Mbyte device would suite me
fine. I have not had any success in obtaining the interface specifications
nor the protocol as yet.
The write rate is 1.5 Mbits/s and I the read rate of about 3 Mbits/s. There
are also commercially available PC based USB readers.
>I have a similar requirement and am investigating using Sony Memory Stick
>technology. I need LOTS of memory, so their 64 Mbyte device would suite me
>fine. I have not had any success in obtaining the interface specifications
>nor the protocol as yet.
>The write rate is 1.5 Mbits/s and I the read rate of about 3 Mbits/s. There
>are also commercially available PC based USB readers.
I saw it somewhere...can't remember where. But in the tech site of Sony (which I never remember where it is) you can find it easily...
Alexandre Souza wrote:
>>I have a similar requirement and am investigating using Sony Memory Stick
>>technology. I need LOTS of memory, so their 64 Mbyte device would suite me
>>fine. I have not had any success in obtaining the interface specifications
>>nor the protocol as yet.
>>The write rate is 1.5 Mbits/s and I the read rate of about 3 Mbits/s. There
>>are also commercially available PC based USB readers.
>
> I saw it somewhere...can't remember where. But in the tech site of
Sony (which I never remember where it is) you can find it easily...
>
mitvma.mit.edu
