Re: 1-wire to USB converter that can use 1820s directly

[Marc F Hult <MFHult@xxxxxxxxxxxxxxxxxxxxx>]

On Mon, 17 Apr 2006 20:39:07 +0000 (UTC), Byron Hynes <bph@xxxxxxxxxxxxx>
wrote in message  <50cb70804083b8c8303b6f56560c@xxxxxxxxxxxxxxxxxxxxxx>:

>I think you have two choices:
>  1. Purchase an engineered set of matching products, such as those in the
>links below; or
>  2. Build your own.
>
>In order to do #2, you will need to understand more about the 1-wire
protocol
>and wiring options than you seem to do at present. Have you read all of the
>appnotes and forum posts at the Dallas/Maxim site?
>
>I have four temperature sensors (DS18s20) currently logging using this:
http://www.electronickits.com/kit/complete/meas/ck110.htm
>
>
>
>> The problem is that
>> http://www.hobby-boards.com/catalog/product_info.php?products_id=108
>> implys that you cant just add a swag of 1820s in parallel to
>> http://www.hobby-boards.com/catalog/product_info.php?products_id=1503


Here's a third, choice that solves the multiple string problem.
This assembled board is available for ~$55 via PayPal from Dr. Peter
Anderson

http://www.phanderson.com/iom135.html

I have one and can recommend.

It is designed to read and control *eight* strings ("runs") of 1-wire
temperature, dual 32-bit counters and  quad-input 12-bit analog input
devices.

Nothing else comes close to the versatility and low cost -- and for a good
cause (helps Dr Anderson's students).  Dr Anderson also sells many other
devices including a USB -> RS-232 converter if you need it.
www.phanderson.com

... Marc
Marc_F_Hult
www.ECOntrol.org