On 11/01/2017 10:15 AM, Daren Schwenke wrote:
When switching peltiers between heat/cool mode you can get some really
high currents.
I don't know much about it. This one is rated 48W/12V, so I used a
cheapo L298N module, 2 channels at 2A/channel, wired together. (I'm not
sure if that's allowed, but it seems to work.) Do you mean higher
current than 4A?
You may want to include some current feedback and perhaps limit your PWM
during switching, or just keep it from doing that with your PID.
I still need to stick PID comps in there. Right now, it's a dumb
switch, which is why the curve in the time series chart is so bad.
By "current feedback", do you mean monitor current through the Peltier?
How do I limit the PWM? Sorry, you're going to have to spell it out for
me. I'm pretty bad at electronics.
On Wednesday, November 1, 2017 at 11:04:36 AM UTC-4, Daren Schwenke wrote:
Neat idea, and perfect name. :)
Thanks!
John
On Tuesday, October 31, 2017 at 2:07:09 PM UTC-4, John Morris wrote:
I'm working on this Machinekit-based weekend project, the
"Goldibox"
[1]. Kind of like a cross between a fridge and an incubator,
you set
minimum and maximum temperatures on its thermostat, and as the name
implies, the Goldibox will keep its contents not too hot, not
too cold,
but just right.
The last major piece I'd like to do is improve the GUI, but I'll
need
some help. First, take a look at this mock-up of a fancy
thermostat
[2], which combines quite a few controls and gauges into one.
If this
isn't a very difficult thing to program using either QML or C++
code,
I'd do it. Second, below the thermostat, I'd like to add a small
version of the time-series graph (see [1]). This is generated
on the
Goldibox, and would need to be fetched by the remote GUI.
Other than that, it needs a PID control and a few cleanups
before it's
done, and then I'd like to show it off to the Machinekit and
(Pocket)Beagle communities. It seems like the project could be
interesting because it integrates the (brand-new) PocketBeagle,
electronics, Machinekit and QtQuickVCP, and as such represents a
demo of
the complete chain from hardware to phone app. At the same
time, it's
still fairly simple, with complexity just a step above Alex's
AND-Demo.
Of course it's all open source, and I tried to make it easy for
anyone
to try out the simulator in Docker by running just a few
commands (but
expect a few minor hiccups ATM if you do).
I'd highly appreciate help with the GUI, and I welcome your
comments
about the project.
[1]: https://github.com/zultron/goldibox
<https://github.com/zultron/goldibox>
[2]:
https://docs.google.com/drawings/d/1ixn3tSA8_OyTdZ1lz5k4MWjTZ9rEFJM9or3oYW8NuUA/edit?usp=sharing
<https://docs.google.com/drawings/d/1ixn3tSA8_OyTdZ1lz5k4MWjTZ9rEFJM9or3oYW8NuUA/edit?usp=sharing>
John
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