[XCSSA] Meeting Topics for Monday 17th Meeting (over 1 week out)

[X-otic Computer Systems of San Antonio]

Actually, this is the Wheel and Encoder kit from Parallax controlled by 
two HB25 (25 Amp Motor controllers, same input as a servo) with a 
Propeller as brain.

The Prop decodes the signal from the VEX R/C receiver and controls the 
two HB25 as servos.
You can pretty much take any standard R/C setup and hook up the HB25s as 
"servos" if you want to. However Allelectronics sold the VEX 
Transmitter/Receiver kit for $30 a while ago and there is already an 
object for the Prop to decode the signals so my choice was pretty simple...

This rig is far from finished, I still need a mechanism to open the lid 
for example and I'm sure I'll come up with a bunch of other silly ideas 
as well...
I wasn't really going to show this until I had some more work on it but 
since we don't have that much for the meeting tomorrow, I thought I'll 
show it anyway...

I think what fooled you to think I was using an Amp is that I didn't 
have a project box big enough so I gutted an old non-working DVD-player 
and put all the electronics in the case.

However that would have been an awesome hack to use an amp as a motor 
controller... ;-)

/Fredrik



X-otic Computer Systems of San Antonio wrote:
> On Sunday 16 August 2009 03:52:27 pm X-otic Computer Systems of San Antonio 
> wrote:
> [...]
>   
>> http://i385.photobucket.com/albums/oo298/fsafstrom_2008/100_1081.jpg
>> http://i385.photobucket.com/albums/oo298/fsafstrom_2008/100_1083.jpg
>>     
>
> Fredrik.. After looking at this a second time.. I just realized that you've 
> either set this rig up to crank some serious high power tunes.. OR you're 
> using a freak'n audio power amp as a PWM motor controller!  If the latter.. 
> that's freak'n ingenious!  And one of the more quick-n-dirty-elegant ways 
> I've seen anyone do a high power robotic motor controller.. What a cool idea!
>
> Is there even a microcontroller involved at all with this project?  Or is it 
> just a receiver and PWM out to amp-in?  Is it running from a power inverter.. 
> or are you just using lower voltage (12V) class B amp voltages?
>
> Did you come up with the idea on your own? Or have you seen other people using 
> a audio power amp as a PWM motor controller?
>
> Maybe I'll bring my O-Scope so that you can show what PWM actually looks like 
> and how it works.
>
> Tre cool man!
>
> Tweeks
>
>
>   
>> /Fredrik
>>
>> X-otic Computer Systems of San Antonio wrote:
>>     
>>> Well folks.. it sounds like Tim has a friend in town and isn't going to
>>> be able to make XCSSA to show us the latest evolution of his midiSID
>>> system.
>>>
>>> I had planned on doing a casual presentation on various USB-bootable
>>> distros.
>>>
>>> Fredrik?  Bruce? Anyone else have plans to bring someting in to show?
>>>
>>> If we're light on presentations and show-n-tells.. I supposed I could
>>> also muster an overview of either doing LVM on Linux by hand (to piggy
>>> back on Tim's previous talk about his NAS setup and how to do LVM + SW
>>> RAID.  If anyone's interested.
>>>
>>> Tweeks
>>>       
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