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

[nobody@xxxxxxxxxxxx (Dave Houston)]

The Elektor schematic I found shows it to be self-powered. Is that correct?

It appears to use the same Maxim drivers linked in the DS9490R datasheet. Is
this an HID driver? If so, maybe Jan Axelson's page on VB & HID drivers will
help.

     http://www.lvr.com/hidpage.htm

Why don't you like serial for this? I see no advantage to USB given that it
takes 3/4 second to get a reading from a 1-wire device. Is the 18B20 faster
than other 1-wire devices? It seems to me that off-loading this from the PC
to a serial PIC that can report readings from multiple sensors is the best
way to go.

"Rod Speed" <rod.speed.aaa@xxxxxxxxx> wrote:

>Dave Houston <nobody@xxxxxxxxxxxx> wrote
>
>> I don't use 1-wire myself so am not familiar with its details but
>> the DS9490R appears to do at least part of what you ask.
>
>Yeah, thats basically what the commercially
>available USB/1-wire converters/adapters use.
>
>> The datasheet indicates there are Windows drivers for it.
>
>Yeah, tho I didnt find they are that convenient to use.
>
>I actually have the Elektor USB/1-wire converter/adapter
>and have implemented it, with some downsides drivers wise.
>Should try the latest tho, its been a while since I did that.
>
>> http://www.maxim-ic.com/products/ibutton/products/1wire_adapters.cfm#USB
>>     http://pdfserv.maxim-ic.com/en/ds/DS9490-DS9490R.pdf
>
>
>> "Rod Speed" <rod.speed.aaa@xxxxxxxxx> wrote:
>>
>>> I want to have a number of 1-wire 1820 sensors thruout the house,
>>> and want to minimise the cost of those so I can use them wherever
>>> it makes sense to have one like in all the fridges and freezers etc
>>> so I can do basic stuff like alarm on out of acceptable range etc.
>>>
>>> The obvious way to do those physically is to use phone extension
>>> leads with RJ11 connectors on each end. Just cut them in half
>>> and solder a 1820 on the bare end of each half. Then just connect
>>> them all in parallel using standard RJ11 sockets on vero etc or
>>> in punch down blocks etc.
>>>
>>> What I want is a fully assembled USB/1-wire converter
>>> that can be used to interface those to the PC.
>>>
>>> I also need at least a decent driver that can
>>> be used from VBA from Access or Excel etc.
>>>
>>> The stuff thats obvious on the web mostly dont use such
>>> unpackaged sensors. Cant see any reason why its not possible tho.
>>>
>>> It would be desirable to be able to use any standard
>>> 1-wire sensor ics too, but not absolutely essential.
>