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

["Rod Speed" <rod.speed.aaa@xxxxxxxxx>]

Rod Speed <rod.speed.aaa@xxxxxxxxx> wrote
> Dave Houston <nobody@xxxxxxxxxxxx> wrote

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

> Powered from the USB, yes.

>> It appears to use the same Maxim drivers linked
>> in the DS9490R datasheet. Is this an HID driver?

No its not.

> Not clear to me what a HID driver is. It definitely uses java.

>> If so, maybe Jan Axelson's page on VB & HID drivers will help.
>
>>     http://www.lvr.com/hidpage.htm
>
> Thanks for that.
>
>> Why don't you like serial for this?
>
> Basically because I dont have enough serial ports available,
> the only one available is used for the X10 controller,
> and USB/serial converters are too much of a kludge.
>
>> I see no advantage to USB given that it takes
>> 3/4 second to get a reading from a 1-wire device.
>
> Sure, its not a speed thing.
>
>> Is the 18B20 faster than other 1-wire devices?
>
> Dont think so.
>
>> 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.
>
> Dunno, I basically have a number of temps that dont need to
> be polled that often, every few minutes is fine, and want to
> use those to control the X10 stuff, particularly with temp
> control etc controlling a portable fan heater that I sit in front
> of and other stuff like the heater for the beer brewing.
>
> And other temp sensors that only need to be polled hourly at
> most for more basic alarm stuff like the freezer has failed etc.
>
> And some basic logging of temps in the house, hourly would be fine.
>
> Serial is just a bit dinosaury if I can just have the string
> of 1820s on a USB/1-wire converter/adapter with at
> most say providing 5V to the 1820s on one of the
> spare wires instead of parasitic power for the 1820s.
>
> Nice clean simple design.
>
>
>
>> "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.