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

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

Marc F Hult <MFHult@xxxxxxxxxxxxxxxxxxxxx> wrote
> Rod Speed <rod.speed.aaa@xxxxxxxxx> wrote
>> Dave Houston <nobody@xxxxxxxxxxxx> wrote

>>> 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.

> Peter Anderson's USB Versions of the IOM #135E and IOM #136 Modules
> http://www.phanderson.com/iom13x_usb.html
> use the FT232BM USB - RS232 adaptor.

Still much more clumsy than a bog standard
USB/1wire commercial converter/adapter.

> That solves the "I don't have enough serial ports available"
> (non)problem.

No it doesnt.

> And if the FT232BM is "too much of a kludge", thar's lotsa
> of kludges out thar because this chip is in very widespread use.

Yes, kludges are quite common. Still makes a lot more sense to
use a bog standard USB/1wire commercial converter/adapter if it
will drive the string of 1820s fine, and it appears that that will be fine.
At worst it might need one of the spare wires on the RJ11 cables
used to drive the 1820s in non parsitic mode and doing that is a
hell of lot simpler than using a IOM #135E or IOM #136 Module
and a FT232BM USB - RS232 adaptor packaging wise alone.

> The schematic for this comes with the board. The RS-232
> version I have is a Olimex PIC-P40-D board with 4.7k series
> resistors on the data lines and the MAX232 RX and TX
> connected to pins 25 and 26  of the PIC16C774
> Schematic here:
> http://www.olimex.com/dev/images/pic-p40b-sch.gif

> Here's the schematic for the USB version:
> http://www.olimex.com/dev/images/pic-p40-usb-sch.gif

Thanks for that.

>>> 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.

> What Dave suggests is exactly what Peter Anderson has implemented.

Duh. And I dont see the need to offload with that low a level of non
time critical 1wire activity if a bog standard USB/1wire commercial
converter/adapter will do the job fine. And it appears it will.

<reams of your puerile shit flushed where it belongs>