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When you microwave something with a handle (eg a jug of
custard) and press stop, then invariably the handle is not by
the door necessitating a grovel around a piping hot vessel to
retrieve it.
This is both awkward and dangerous.
The solution is to mount an internet connected camera facing
inside the microwave. Then over a period of months build up
a library of deep learning data videos. Once we have say 1000
videos, we can split them into 90% data and 10% verification.
We then apply deep learning to train a convolutional neural
network (CNN) to recognise the angle of the handle.
Once trained, the CNN is put in control of the turntable, and
the off switch re-routed via a controller so that when the
microwave is switched off, the heater cavity magnetron is
stopped, but the turntable keeps rotating until the jug handle
faces the door.
A simpler option might be to create a jug with multiple
handles, say every 90°s.
A more complex option would be to use the backscatter of
the microwaves reflected off the jug as a signal source for the
CNN training.
Mug-handle sensing microwave oven
Mug-handle_20sensing_20microwave_20oven
Previous Halfbakery idea - but without the deep learning CNN [TonyDeaf, Oct 05 2021]
US4939333
https://patents.goo...atent/US4939333A/en
[xaviergisz, Oct 05 2021]
US8124920
https://patents.goo...om/patent/US8124920
[xaviergisz, Oct 05 2021]
[link]
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I had a microwave that would always leave the handle in the
position it started. I don't remember the exact timing, but it
would make a complete rotation in 5 or 10 seconds. So for
most times, it would end in the same position. If I put in a
time like 18 seconds, I'd hear the tone change after 18
seconds when it turned off the microwave, but the tray
would continue to turn for 2 more seconds so it would stop in
the original position. Of course if you interrupted the cycle,
the handle could be anywhere. |
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Oh, and it used a synchronous AC motor running on 60Hz from
the power line, so it was quite accurate in knowing the
position based on how long it was running. I assume they had
a different program for 50Hz countries, or could detect the
frequency with the controller to compensate. I think that
system provides a significant cost savings and reliability
advantage over a neural net. |
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Surely simpler to not rotate the jug at all, but instead to
rotate the magnetron around the jug? |
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Could rotate this idea around [8th]s very similar idea, the tidal drag of one idea on the other could power the CNN. |
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It's a 16sec rotation on mine (probably due to 50Hz) so 800
cycles = 1 turn. |
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So all I need to do is replace the timer control with one that
works on on multiples of 16 seconds. |
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A deeper door would help, if the door were ~100mm deep
hinged further back so that when you open it a good amount
of the turntable is exposed and accessible. |
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You could mount the turntable on the door so that when it
opens the jug comes out with it ? |
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You could mount the turntable on the door so that when it
opens the jug comes out with it ? |
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1: This is widely baked.
2: This has been done to death here, despite being widely
baked.
3: It doesn't need AI or cameras or anything fancy; it just
needs to rotate the turntable a whole number of times (as
per the baked offerings).
4: Microwaves that don't have a turntable (they scatter the
microwaves instead) are baked.
5: Most microwave turntables I've bothered to observe have
a rotation every 12 seconds (50Hz where I live);
unfortunately my (cheap, old-ish) microwave just has a dial
for the timing, so it's hard to accurately get multiples-of-12
for the time. |
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Have had the daunting task of replacing the illumination bulb
in a microwave oven. Dare I say I'd vote first for an easier
way to do that? I'd even contend with a hot pot being out of
reach if it were possible to see the pot at all. |
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As a twist (pun intended) I would have the center tray with
your food remain stationary while having the entire circular
microwave rotate until the door faces the front again. Boring
people would just have the magnetron rotate - but where's
the cool factor in that? |
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You're thinking too small. Mount the turntable on gimbals angled for your latitude, and use a 24-hr cooking cycle (may need a pulsed or less powerful magnetron) |
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//Have had the daunting task of replacing the illumination
bulb in a microwave oven.// |
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I've never had to do this, which is odd. Every other
appliance bulb seems to require replacements on the order
of months. My microwave says it was made in 2010, 12
years of intermittent use is good going. I've been
anticipating it going for so long, I've started to dream up
more interesting strategies for it's replacement... Can I
replace it with a 100W LED so that the microwave looks like
it contains a captive star? How easy would it be to modify
the mesh on the door so I project something interesting on
the opposite wall? |
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//modify the mesh on the door//
Ooh, that sounds like a good trick. Although the light might be
already too diffuse by the time it escapes through the door to
"project" anything coherent. Depends where the bulb is &
what else is between it & the door. Might need to re-paint the
inside of the body of the microwave so there's less light
scattering.
Worthy of it's own idea, in fact (for further discussion). |
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