First off - Thank you Stuart you are more than generous. Both dad and I
had a wonderful time at the fest. I hope we can keep this up more
often. 3 years was way too long.
Now we had some success at the fest.
Andy P asked if I would bring the accupins from the old GE control
on the k&t.
http://www.electronicsam.com/images/KandT/conversion/accpinset1.jpg
Well - saturday (yah we don't get side tracked - do we?) We started
doing some basic tests on the read head. Andy had a frequency generator
and we started injecting a signal into one of the coils. We could sort
of see a shift of the return signal and goofed around with it for a
bit. Jeff E was kind enough to whip up an arduino circuit that output 2
square waves 90deg out of phase. When that was hooked up to each coil -
it did something. Just not what was expected. (don't remember what but
not right) After reading back on my notes it dawned on me that the
signal really needed to be isolated (the original circuit was driven by
a push pull h-bridge) Pete W came by and said - if you have enough
outputs you could generate differential signals. Duh. Back to Jeff E
and 2 seconds later I had a new arduio program.
That started looking promising. Chris R came over and was poking
at the scope. We could see it shifting as the scale was moved - but the
amplitude also changed. We must have went around in circles for a while
before we decided to change the arduio frequancy from 10khz to the 250hz
that the original control used. (I got stuck on 10khz because that was
what seemed to go through the coil with Andy frequency generator). I
hooked up the circuit and Chris fiddles with the scope. He exclaimed -
'I think it is working!' and he was right.'
http://www.youtube.com/watch?v=im79QbffjCQ
with a bit of filter
http://www.youtube.com/watch?v=x6hzesMM7EM
this is why it looked a bit noisy... :)
http://www.electronicsam.com/images/KandT/Fest2013/DSC_3931.JPG
After a bit of happy dancing - Andy and Jeff started looking at the
signal. I got sidetracked again and didn't really pay attenion to what
they where discussing. What they decided was that they could also read
the output with an arduino.. A bit later - Jeff shows up with a way to
log the output. he goofed around with it and graphed some of the data
and it looks very exciting.
Thanks again for everyones input!
sam
On 06/24/2013 08:48 AM, Stuart Stevenson wrote:
> Gentlemen,
> First response - WOW - the only word to describe the week.
>
> Over thirty people attended this week. When I posted the meeting time and
> place I thought eight might show up and twelve would be a large number. I
> was surprised! Many states were represented as were Canada, UK and Austria.
> What a joy to meet and get to know everyone.
>
> Cool stuff:
> 3D printing
> Web page (and Android) control
> Watching techs with scopes ferreting out signals from electronic devices
> Programmers trying software control experiments
> Discussion about software/hardware timing and protocol.
> Meetings about changes in software and hardware.
>
> This was overwhelming on a daily basis!
>
> From groups of two or three around the room to a couple complete group
> gatherings an air of expectation was exhibited by excited voices and arm
> waving descriptions. It was difficult to stay listening to one group while
> overhearing another. Which do I want to concentrate on? I know I missed a
> lot of information I would have loved to have heard.
>
> I can now put a face and voice to many of the names on the communication
> channels. Last night I was hearing their voices and seeing their faces
> while I was reading some of their emails. What a communication enhancer.
>
> Last response is WOW!
>
> Thank everyone for attending and making this a memorable and productive
> meeting!
> Stuart
>
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