Re: [mh] iButton Module Error

[Jim M. <j.m...@vi...>]

On Sun, 7 Jan 2007 22:09:45 -0600, Trey Hilyard wrote:

> Well, I am just getting started (again) with iButtons and One-Wire stuff.
> 
> I bought a new iButton interface and MH sees the two temp sensors I have
> hooked up but when I try to run commands to read the temps from them, I get
> the following error:
> 
> Error in menu_run: m=Ibutton i=1 s= action=Read the ibutton temperature 2
> error=
> Can't locate object method "ibutton" via package "temperature" (perhaps you
> forg
> ot to load "temperature"?) at (eval 902) line 1, <GEN152> line 10.
> 
> I am still digging through the code, but thought I'd post this out here to
> see if anyone has run across this before. I am having trouble figuring out
> what "temperature" package it is referring to. I must be missing something
> easy.
> 
> If you have any suggestions, please let me know.
> 
> -Trey

Hi Trey,

A couple of things to check:

Are you loading iButton.pl ? (from code/common) This will let you connect
to the iButton/One-wire devices. It is what handles giving you a list of
what devices are connected.

Have you declared the sensors as items -- either in setup-edit items or in
your user code. (I did it using setup-edit items) If you declare the items
in your code make sure they are declared as 'iButton' items as per the MH
docs.  
Ex. $Temp_HP  = new iButton 'xxxxxxxxxxxxxx';

The x's are the iButton/One-wire device id that you can get with the List
iButton in Browse Categories/iButton.

Declaring the device type is what lets MH know what device module to use to
control it both of connection and orders that each type of iButton/One wire
device can use.


An example on my system two of my temp-sensors are called 'Temp_HP' and
Office_18B20

In one of my user codes I have the following lines

if ($New_Minute) {

  $Save{HP}=read_temp $Temp_HP;
  $Save{Office}=read_temp $Office_18B20;
           	 }

Since both devices ($Temp_HP and $Office_18B20) have previously been
declared as iButton type, MH knows that it has to look in the iButton
device.pm (it's in lib/site/hardware/iButton)to find the 'read_temperature'
subroutine.

Hope this helps
Jim