[Putting back on list]
On 11/01/2017 02:30 PM, Chris Albertson wrote:
On Wed, Nov 1, 2017 at 10:50 AM, John Morris <j...@zultron.com
<mailto:j...@zultron.com>> wrote:
The value IMO is in the demonstration of a full integration from
electronics to remote GUI, and in the overall simplicity for
learners. Maybe it's the lesson that comes after Alex's AND-Demo.
NO, this does NOT demo over all simplicity. It is very complex compared
to that way this is typically done. This is a problem that has been
solved 100 times already so we cam see how others have one it. OK
assuming you want an Phone base point and click app to control and ice
box and you want it to serve as a demo to show how it is done then at
each step you really should use the "canonical solution". That is the
cleanest and simplest design at each step. and use the simplest and easy
to understand interfaces between the parts.
Such a demo would have layers, each layer easy to understand and the
connection between the layers using an simply interfaces. I'd d it
this way
1) physical device. Ice box the Pelitier heat/cooler. This is just a
Pelteir with a heat sink on both sides, on heat sink inside and one
outside the box, possible with fans on each. Then a power supply and
the H-bridge. You also need temperature sensor(s) inside the box, not
mounted to the heat sink
2) controller. connect to temperature sensor(s) and h-bridge and to
control device. It accepts the temperature set point from the user
and reports internal temperature and maybe battery stays if this is
battery powered. You PID controller loop runs soon this controller.
This runs on a tiny micro controller. The modern equivalent to the
Arduino. This controller work independently from the use interface
because you don't want to have to runs a computer of cell phone app 24x7
for something so simple at a temperature controller.
3) user interface app. This runs on a phone or computer, connects to
the above controller, can pull temperature log and change set point. It
might have nice graphic and maybe can save data to the cloud. But then
it terminates and lets yto use computer/phone for other purposes It
would very seriously consider using a wireless interface from this to #2
above. Pickone that is already built into the phone and computer. WiFi
or Blue Tooth
What this ice box this really is, they call "The Internet of Things"
(IOT). The concept is they are really simple but are CONNECTED. It
theemoerging world IOT is everywhere. light switches, refrigerators and
toaster ovens and cloths wasters and drying and your car and maybe even
shoes (that tack steps) They make spelled chips for under $1 that
can be used t make controllers like #2 above. I'd use one of those as
they will have the required interfaces built-in and are made to use just
mmecoamps of current and of course cost almost nothing.
Seriously I've sen IOT light bulbs. An entire computer and WiFi cheap
and small enough to go into a light bulb so you can program the color
temperature and bightness without need to rip up walls and install cables.
Your Goldilocks box is prime example if an IOT device. IOT devices are
way-simple and do just one thing and link to a phone/computer using
standard Internet Protocol. . Controlling a peltier heater/cooler is
exactly this.
Chris, you have a lot of good ideas about what constitutes a valuable
demo. There are so few non-CNC examples of Machinekit HAL, HAL talk and
QtQuickVCP that just work out of the box. Maybe you'd consider
contributing a layered example of your own using Machinekit and friends,
one that demonstrates how easy it is to take a canonical solution and
build nifty IoT devices.
John
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github:
https://github.com/machinekit
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