Solarwind,

I appreciate the response, and the look at your code, but I am writing in 
assembly.  However, looking at you code shows
I am using the same algorithim.  The timing you use is the same as I am 
using.  Our versions of the software ar basically
the same.  The only major difference is yours is in C, and mine is in 
assembly.   I'll forward mine to you as soon as I get it
cleaned up a little.

Thanks again for the response.


Regards,

    Jim


----- Original Message ----- 
From: "solarwind" <x.solarwind.x@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Wednesday, August 12, 2009 2:57 AM
Subject: Re: [PIC]: One Wire Temp Sensor Question


On Tue, Aug 11, 2009 at 9:11 PM, jim<jim@jpes.com> wrote:
> All,
>
> I don't know what the difference is between the 1822 and the 1822+, but I
> have the 1822, not the plus version.
> But, in the application I have in mind, it doesn't need to be parasite
> powered. It was just a convenience that I
> would like to have implemented.

I have a lot of experience with this device (but no time at the moment
to write out a good answer).

All I can say is that the + version is Maxim's way of saying that the
device is ROHS compliant (if I can remember correctly), nothing else.
The DS18B22 is simple to interference.

Here is some C code (for CCS C) that I used to interface the device
early in my prototyping stage.

http://solar-blogg.blogspot.com/2009/04/ds18b20-1-wire-driver-for-ccs-c.html

Try looking at the code and figuring out the device. The datasheet has
all the info you need (and it's short and concise so not much reading
to do). Sorry I can't give a detailed reply (really short on time).

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