For anyone who gets a late-night craving for anything out of the refrigerator and needs some help in the willpower department, [Claudio] may have the project for you. He has just finished work on a project that sends out an alarm when the refrigerator door opens, alerting others that you’re on the prowl for munchies.
The device uses a light sensor connected to an OpenPicus IoT kit that contains a FlyportPRO Wi-Fi module. When the refrigerator door is opened, the device sends out an email message via a web server, which can be sent to whomever you choose. All of the project’s code and instructions are available on the project site as well.
The project is pretty clever in that no actual interfacing with the refrigerator is required, beyond running a power cable through the seal of the door (although [Claudio] notes that the device will run on a lithium battery as an option). The web server itself can be set up to send out alarms during any timeframe as well, allowing a user to customize his or her nighttime snacking window. If you’re looking for a less subtle approach, we’d recommend the fridge speakers with a volume setting of 11.
Electric Imp would be a good platform for this kind of project. It even includes a light sensor!
Slide spatula in door at switch, open door in the dark. All just to get a drink of cold water!
Or simply Unplug the router
Reused fridge door switch with external battery (probably a couple NiMH AA’s) a secondary/disarm switch, and a LOUD buzzer would be my chosen solution ;) Mom and I are fairly short (I’m 5’3 and she’s 5’0) so hide it on top of the fridge and nobody will be the wiser… until the door opens ;)
Use thin wires and you won’t have a problem. Cheap Radio Shack buzzers don’t need much current anyways, IIRC.
just what I needed for my 2 year old (he needs help to get something to eat)
I am willing to bet that you would still over-eat even with this, so why waste the time. If you are an over-eater, you will always be an over-eater.
Ok, so thought experiment here. What if you lived with some tough dudes, and every time the fridge alarm went off, they immediately beat you senseless. While the exact solution maybe not practical for most people, one can imagine how external modifications to behavior ARE possible.
Um, wait until they are not home? An honor system is an honor system and will be easily curcumvented by anyone who doesn’t want to honor it.
Lithium Ion batteries HATE cold. Their apparent capacity drops to virtually nothing. If you want a battery for cold use lithium primary cells.
Only below freezing, which should not be the case for the lower/right side of the refrigerator.
I have had batteries get down to the 40’s and their output was useless until they warmed up again.
I would be more worried about the inevitable moisture in the fridge corroding/shorting something out at some point. A lithium battery fire in the fridge, hmmm …
The alternative, breaking the door seal, is a really really terrible idea unless you want to pay high electricity bills and/or have the fridge compressor die a premature death due to much higher loads than designed for.
Another issue this has is that the hardware he is using most likely isn’t designed to work in an environment this cold. I guess high reliability isn’t the top requirement for this project, but he might get a surprise when things stop working …
A much simpler and more reliable solution would have been opening the part of the fridge where the internal light is mounted and simply either putting an LDR there or directly tapping into the lamp wire (probably isn’t mains powered due to the risk of moisture/condensation). Then the electronics could be outside of the cold part of the appliance – saving trouble with both condensation, cold and getting external power in.
Typically, refrigerators are very dry environments. Moisture usually results when you take cold items out of the fridge and they get condensation from the outside air.
Also the lamp usually is a standard 40W mains powered appliance lamp. At least in standard models, there’s lots of fancy new fridges out there that may differ.
As taste-tempting as cans of something called Faglioli and balogna with giant fat blobs are, I wouldn’t really need an alarm to keep me from raiding that particular fridge XD
Yeah…. and who keeps a can of Faglioli in the fridge anyway??? :)
he’s in italy
Hi! Thanks for the comments. Yes our Nerdy fridge is not really gourmet style even if we are in Italy :-)
Reminds me of a ‘thing’ I put together, I found this novelty keychain of a plastic barrel with an eye looking out and a button that played a pre-recorded message, so I took the circuit+speaker out and wired it to a Picaxe along with a battery pack + LDR.
Programmed the Picaxe to respond to light levels so 10 seconds after the fridge door was closed a voice from inside would shout “Excuse me! EXCUSE ME! CAN YOU LET MY OUTTA HERE?!”
I think I’d just use a reed switch on the door and keep all the electronics outside of the fridge.
Yeah. And a relay. No microprocessor necessary.
My bad. Forgot about the internet part. Definitely need a microprocessor. Now for a cup of coffee
Where is the SHITDUINO hidden? I just can’t find it!
Good one! I think I will agree that this one would be a good way to keep accountability for the dieters, but I will also say that this could be a great idea for those who share an apartment (and a fridge). This also sounds great for those who live in a dorm. Perfect for college students who are trying their level best to keep their orange juice (and milk) from the paws of their dorm and roommates. Wouldn’t mind being woken up when someone’s trying to steal my milk! Ha!
I found that keeping a guinea pig in the room next to the kitchen is very effective. Every time you open the fridge she makes this loud alarm sound.
Paul Haas had a temperature interface to his fridge back around 1990. It reported the temperature of a can of coke, and whether the fridge door was open or closed.
The initial interface was via the finger command – finger something@hamjudo.org.
A monitor for the hot tub was added later, along with a web interface.
The hottub was first available over email and finger at something like hamjudo.mi.org!hottub. The web interface was only a day later. I think that was first available in 1993. The refrigerator was months later. The site was available through a weird domain name as a customer of my ISP and hamjudo.mi.org. In April of 1994 the site was also available as hamjudo.com. I will power things back up if I ever get around to fixing the hottub.
Heh. Guess I had some details wrong. But sorta close.
The hot tub is broken? Who are you and what have you done with the real Paul Haas?
You probably aren’t even wearing a tuxedo t-shirt.
I have not see anything that detects when the fridge door is not completely shut. That would be a useful alarm. I’d want it to know that the door was almost shut but not shut – wait 5 seconds and then beep once a second until it got closed.
My relatively-new (2 years old) fridge has a door-open alarm. I would have thought that most new fridges would have the same….?
https://www.youtube.com/watch?v=ltu2APaUV3Q