Jack:

Thank you so much.

I filled out the form for samples of the Dallas Semi
DS1302.

I'll look into external EEPROMS... I am hoping to have
the light test done by the end of December. Hopefully
Dallas will send the chips.

>I'm assuming you don't want to store a burst of
> hundreds of samples/second

No I don't need 100 of samples a second.. just one or
two.

Write me separate from the list and I can send an
email about the project.

What are you working on that is similar in nature?

- Lewischicken

--- Jack Smith <Jack.Smith@COX.NET> wrote:
> "I am intersted in the ability to time stamp an
> analog
> "signal, save that time to memory (WRITE) and then
> at a
> "later time... when a switch is pushed take
> everything
> "in memory (READ) and replay it in order of a
> specific
> "time sequence.
>
> "I have the MBasic manual...but it is not helpful.
> Or I
> "am not understanding it
>
> "... I can start simple:
> "Every time I push button[A] its time and date are
> "stored as a variable in the EEPROM. Then when I
> flip a
> "switch that information is recreated by turning a
> "light on and then off in the exact same timed
> sequence
> "it was recorded. (on when pushed, off when not)
>
> I've implemented something quite similar in MBASIC.
> The easiest way to get
> time of day information is with an external real
> time clock chip.
>
> Take a look at the MBASIC User's Guide, page 178-181
> covering ShiftIn, and
> the Dallas Semi DS1302 real time clock. (Note that
> there is an error in the
> manual, as the sample code misses setting the
> Day-of-the-Week, thereby
> putting the Year into the DOW. You have to add an
> extra data element. It's
> shown in the DS1302 data sheet.)
>
> The idea is to use the DS1302 real time clock to get
> the time/date (1 second
> resolution) and then you can store the date/time to
> EEPROM, along with the
> ADC reading.
>
> You will find, however, that the build-in EEPROM is
> not going to give you
> very many data points if you store SS:MM:HH DD:MM:YY
> + 10-bit ADC, you will
> find that it consumes 8 bytes unless you compress
> the data. You may also
> need external EEPROM. If you look at Pages 184-184
> of the MBASIC User's
> Guide, you will find some sample code demonstrating
> how to write to an
> external EEPROM chip.
>
> In short, what you are asking about is quite
> accomplishable in MBASIC, but
> it requires you to use a couple extra inexpensive
> chips.
>
> (I'm assuming you don't want to store a burst of
> hundreds of samples/second
> and time each one to microsecond accuracy. That's
> also possible, with mixed
> MBASIC and assembler but is going to require a lot
> more effort.)
>
> How soon do you need your project? I'm working on
> some documentation that
> might help you, but it's unlikely to be in useful
> form until Spring 2004.
>
> Jack Smith
>
> --
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> (like ads or off topics) for you. See
http://www.piclist.com/#topics


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