RE: [misterhouse-users] Strange bug regarding LM14 and percentages

[<s-m...@tr...>]

-=> On Wed, 27 Sep 2000 21:09:17 -0500, "Bruce Winter" <br...@mi...> said:

>> (thanks Bruce!), I have noticed that the "percentage" settings, like:
>> set $heat_lamp 12%
>> are not very reliable.  Sometimes they give a "bad housecode" error,
>> with the CM11 rejecting housecodes of "%".

> The problem here is we don't have all % numbers defined in
> mh/lib/X10_Item.pm.  Currently it is only defined for every 5%.  

Doh!  That would explain it.  I was computing the percentage (based on
the current heat and the target temperature), as anything from 0 to
100%.  I didn't know it had 5% steps only.

> Do you think < 5% resolution would be useful?  I think the LM14
> supports 64 levels, so that could give us about 2% resolution.

Now that I know, I fixed it with just this:

sub percentage {
    my ($percent) = @_;
    return ("&P" . int ($percent * 63 / 100 + 0.5));
}

set $terrarium_heat &percentage($heat_level);

etc.

Now I send &Pxx levels instead of a percentage, and it works every
time.  (The finer granularity does seem to make a difference.  By
tweaking the heater by small steps, I can get pretty tight temperature
control.)

Thanks for the heads-up.
-Steve