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A while back someone, not mentioning any names, left the freezer (upright type) door open and all the food thawed and had to be pitched. Was an expensive lesson!
So I designed a hardware/software solution; designed the PCB, sent off last week and got it today. Soldered, preliminary tests showed everything OK. Programmed the MCU, installed and ran a test.
The oddity; hardware and software worked first time as designed...I don't know about y'all but that happens so rarely with me.
During testing I had to let the alarm go off and it scared the SO. It is a really, really loud alarm.
A home without books is a body without soul. Marcus Tullius Cicero
PartsBin an Electronics Part Organizer - Release Version 1.4.0 (Many new features) JaxCoder.com
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Mike Hankey wrote: A while back someone, not mentioning any names, left the freezer (upright type) door open and all the food thawed and had to be pitched
Mike, I didn't want to say this, but... it was me.
Jeremy Falcon
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Just curious, what did the chicken do?
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Crossed the road, obviously 😂
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At least it tried before Mike chucked it across 
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At least no one questioned its motives for doing so.
Software Zen: delete this;
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Mike Hankey wrote: The oddity; hardware and software worked first time as designed...I don't know about y'all but that happens so rarely with me.
I can relate to that. It happens from time to time, but it somehow gives me the impression I am overseeing something that will give me a bad surprise a time later.
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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May I please inquire the means by which the gadget senses the freezer door open overly long. Temperature? Time?
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It uses a Proximity Sensor[^] that when broke starts a timer and timer stopped when closed. If time period target is reached the alarm goes off. Simple circuit and firmware.
I'm writing an article for my site if interested in details, going to try and finish it today. (See sig)
A home without books is a body without soul. Marcus Tullius Cicero
PartsBin an Electronics Part Organizer - Release Version 1.4.0 (Many new features) JaxCoder.com
Latest Article: EventAggregator
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Thank you kindly. A not sure how such can be integrated after market. It seems it is necessary to drill hole for mounting the sensor. If so where would it be mounted. I can only imagine it is somehow mounted into the side of the door or the side of the door frame so that it senses the mating surface. Also where is the circuit board mounted. Also where is power obtained. I assume not a battery. Perhaps it can be external if door is not flush.
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Mike Hankey wrote: If time period target is reached the alarm goes off.
So no standing there contemplating which donut one really wants to pull out for breakfast this morning?
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When the door is closed it turns the alarm off, so get the donut and get out. 
A home without books is a body without soul. Marcus Tullius Cicero
PartsBin an Electronics Part Organizer - Release Version 1.4.0 (Many new features) JaxCoder.com
Latest Article: EventAggregator
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My refrigerator and freezer both beep if left open too long.
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Fridge does, evidently freezer does not.
A home without books is a body without soul. Marcus Tullius Cicero
PartsBin an Electronics Part Organizer - Release Version 1.4.0 (Many new features) JaxCoder.com
Latest Article: EventAggregator
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Do you have any spare Borg nanoprobes laying around? 😆
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MSBassSinger wrote: Do you have any spare Borg nanoprobes laying around?
Fresh out and didn't think to order more. 
A home without books is a body without soul. Marcus Tullius Cicero
PartsBin an Electronics Part Organizer - Release Version 1.4.0 (Many new features) JaxCoder.com
Latest Article: EventAggregator
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Quote: During testing I had to let the alarm go off and it scared the SO. It is a really, really loud alarm
I was an embedded systems programmer in the engineering department of a fire alarm company. I know that reaction intimately.
Cheers,
Mike Fidler
"I intend to live forever - so far, so good." Steven Wright
"I almost had a psychic girlfriend but she left me before we met." Also Steven Wright
"I'm addicted to placebos. I could quit, but it wouldn't matter." Steven Wright yet again.
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Looks like a lot of work. I'm no electronics engineer but could you not have had some kind of wireless board with a light sensor (starts timer when registers light) that you could have strategically placed inside the freezer? But I suppose it might freeze admittedly lol.
Alternatively, as the above ide was stupid, could you have put something on the wall preventing the full opening of the freezer door thus not able to leave open (could still prop open of course, but so can the alarm be ignored). I admit it wouldn't have been as much fun to build, but a simpler solution.
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There were countless ways I could have accomplished this, but I had the components I used on hand. Except the PCB, which I designed and ordered, but I had the circuit on a protoboard but didn't like how it looked.
A home without books is a body without soul. Marcus Tullius Cicero
PartsBin an Electronics Part Organizer - Release Version 1.4.0 (Many new features) JaxCoder.com
Latest Article: EventAggregator
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Half joking/half serious in saying this, but, you could also simply adjust the front feet so that the fridge/freezer very slightly leans backwards, which will cause the door to always close, by gravity (well, it's not 100% foolproof, but...).
I see you other post saying you had the components and such, . .I get it. .sometimes it's fun to scratch that itch and solve a real world problem with your skills.
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Kent K wrote: I get it. .sometimes it's fun to scratch that itch and solve a real world problem with your skills.
Yep, my inventory is advancing and the list of projects growing.
Problem with projects is that they are so complex I just don't have the time to devote, right now. So the small easy projects are a welcome relief.
The fridge is slightly leaning but for it to completely shut it would have to be a hell of a lean. I think that's what happened, one of thought we closed it and hadn't pressed it all the way closed. Spelt milk and all that!
A home without books is a body without soul. Marcus Tullius Cicero
PartsBin an Electronics Part Organizer - Release Version 1.4.0 (Many new features) JaxCoder.com
Latest Article: EventAggregator
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It will probably wait until you take a brief holiday, preferably in the warm season, then will open the door itself.
Will Rogers never met me.
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Now, you need to create the audit committee to design the process and enforce the paperwork to prove that it is still working. (at least quarterly or whenever you change the batteries in the smoke detectors)
Be sure to file in triplicate.
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Dang I didn't submit it to QA team either.
A home without books is a body without soul. Marcus Tullius Cicero
PartsBin an Electronics Part Organizer - Release Version 1.4.0 (Many new features) JaxCoder.com
Latest Article: EventAggregator
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