Lifehacks

305 Articles

This Freezer Failure Alarm Keeps Your Spoils Unspoiled

July 8, 2020 by 25 Comments

Deep freezers are a great thing to have, especially when the world gets apocalyptic. Of course, freezers are only good when they’re operating properly. And since they’re usually chillin’ out of sight and full of precious goods, keeping an eye on them is important.

When [Adam] started looking at commercial freezer alarms, he found that most of them are a joke. A bunch are battery-powered, and many people complain that they’re too quiet to do any good. And you’d best hope that the freezer fails while you’re home and awake, because they just stop sounding the alarm after a certain amount of time, probably to save battery.

If you want something done right, you have to do it yourself. [Adam]’s homemade freezer failure alarm is a cheap and open solution that ticks all the boxen. It runs on mains power and uses a 100dB piezo buzzer for ear-splitting effectiveness to alert [Adam] whenever the freezer is at 32°F/0°C or above.

If the Arduino loses sight of the DHT22 temperature sensor inside the freezer, then the alarm sounds continuously. And if [Adam] is ever curious about the temperature in the freezer, it’s right there on the 7-segment. Pretty elegant if you ask us. We’ve got the demo video thawing after the break, but you might wanna turn your sound down a lot.

You could assume that the freezer is freezing as long as it has power. In that case, just use a 555.

Continue reading “This Freezer Failure Alarm Keeps Your Spoils Unspoiled” →

The ISS Is Getting A New WC

July 1, 2020 by 32 Comments

Every home needs renovations after a few decades, and the International Space Station is no different. This fall, they’ll be getting a new Universal Waste Management System (UWMS), aka a new toilet.

Though the news coincides with increased traffic to the ISS, this move stems from a more serious issue with bacterial contamination during longer-term space travel. Today’s ISS toilets already recycle urine back into potable water and scrub the air reclaimed from solid waste as it gets compacted and stored. The new UWMS will act more like a food dehydrator, reducing the water content as much as possible to save on space, and petrifying the poo to inactivate the bacteria.

The current commode on the American side of the ISS was designed in the 1990s and is based on the Space Shuttle’s facilities. It has a funnel with a hose for urine and a bag-lined canister with a seat for solid waste, both of which are heavily vacuum-assisted.

Though the current toilet still does everything it’s supposed to do, there is room for improvement. For instance, women find it difficult to engage both parts of the system at the same time, and almost everyone prefers the toe bars on the Russian toilet to the more encumbering thigh bars on the American throne. Also, the current commode’s interface is more complicated than it needs to be, which takes up valuable crew time. Continue reading “The ISS Is Getting A New WC” →

DIY Hand Mixer Whips Coffee Into Shape

June 27, 2020 by 13 Comments

Along with the substantial rise in bread baking over the last few months, many people have been whipped into a frenzy over this tasty-looking frothy coffee beverage called Dalgona. It’s like a caffeinated meringue made from instant coffee, sugar, boiling water, and a whole lot of air that is then spooned onto milk or milk and ice.

Sure, you can use a whisk to mix it up if you don’t mind doing so continuously and vigorously for at least a full three minutes. [HimanshuS8] quickly got tired of making his wife’s coffee this way, and designed a small electric hand mixer especially for this task. [HimanshuS8] happens to be a hardware design engineer, which is why it looks so minimalist and beautiful.

The inside is just as beautiful, mixing junk bin parts like the 6 V motor from a cassette deck with printed gears and beaters. At the risk of reviving an old debate, we hope [HimanshuS8] used food-safe filament for those. If you replicate this, you could try to design it around standard metal beaters instead. Check out the demo after the break while you wait for the water to boil.

Coffee makes everything better, including 3D prints — the high cellulose content in coffee waste has been shown to drastically improve print strength.

Continue reading “DIY Hand Mixer Whips Coffee Into Shape” →

Surviving The Pandemic As A Hacker: Take Care Of Your Mental Health

June 17, 2020 by 42 Comments

As we’ve looked at the subject of face masks in the first two parts of this series, our emphasis has been on a physical step to aid your chances of making it through the COVID-19 pandemic in one piece. But given that the upheaval caused by all the social changes enacted to protect the population are likely to leave an indelible mark on those who live through them, there are significant aspects of surviving all this that go beyond the physical.

This will be a once-in-a-lifetime event for many people, a significant number will find it traumatic in some way, and for many of those people there will be an immediate and then ongoing effect on mental health. If anyone is in doubt as to from what position this is coming, I count myself among that number.

The Pressure Of A Once In A Lifetime Event

Piccadilly Circus, London, during the COVID-19 lockdown. Normally this is packed.
Piccadilly Circus, London, during the COVID-19 lockdown. Normally this is packed. Kwh1050 / CC BY-SA 4.0

Different countries have placed their own public health restrictions on their populations, but it’s likely that many of you are in some form of lockdown situation, with social or communal  activities and locations closed or curtailed, going out restricted, and with all around you in the same situation. A perfect storm of having social outlets removed while simultaneously being stuck at home perhaps with family or housemates you’d prefer not to spend too much time with is not ideal. Add to that the multiple stresses from the pandemic itself as well as other news stories from our turbulent world, and it’s hardly a surprising that it’s taking a toll. Continue reading “Surviving The Pandemic As A Hacker: Take Care Of Your Mental Health” →

Hackaday Prize: Cal-Earth Is Digging Deep To Shelter Those In Need

June 16, 2020 by 41 Comments

For the average person, a government order to shelter in place or stay at home comes with some adjustments. Many changes are cerebral: we navigate vast expanses of togetherness with our families while figuring out how to balance work, life, and newfound teaching roles. Other changes are physical, like giving each other enough space to be successful. A lucky few can say that not much has changed for them personally. No matter what your position is in this thing, if you have a place to shelter, you’re doing better than 20% of the world’s population.

CalEarth founder Nader Khalili leads from the top of a dome in progress.

An estimated 1.6 billion people, including those who are homeless and those who are refugees, are living without adequate shelter. The need for shelter is a cornerstone of human well-being, and yet building a home for oneself can seem totally out of reach. After all, most people aren’t qualified to build a habitable structure without an architect, an engineer or two, and a team of construction workers with heavy equipment. Or are they?

It all depends on the design and materials. Dome structures have been around for centuries, and the idea of using packed earth to build walls is a tried and true concept. Architect Nader Khalili perfected a blend of the two concepts with his SuperAdobe construction system, which employs long sandbags filled with moistened earth. Khalili opened the California Institute of Earth Architecture (CalEarth) in 1991 to explore the possibilities of SuperAdobe and to educate others in the building process.

I grew up among the poor. I am one of nine children, and constantly knew need. I never forgot, so now I’m responding.    — Nader Khalili

This year, the Hackaday Prize is teaming up with CalEarth to push their widely accessible concept of sustainable living into the future. As with our other three non-profits, this effort is twofold. The open call challenge invites you to design sustainable add-ons for SuperAdobe homes that expand their livability and are simple to build and use. Throughout June and July, our CalEarth Dream Team members are working to find ways to automate the process so that these homes can be built much faster, and in turn help more people.

Continue reading “Hackaday Prize: Cal-Earth Is Digging Deep To Shelter Those In Need” →

Day Clock Monitors Air Quality Of The Great Indoors

June 4, 2020 by 6 Comments

As the world settles into this pandemic, some things are still difficult to mentally reckon, such as the day of the week. We featured a printed day clock a few months ago that used a large pointer to provide this basic psyche-grounding information. In the years since then, [Jeff Thieleke] whipped up a feature-rich remix that adds indoor air quality readings and a lot more.

Like [phreakmonkey]’s original day tripper, an ESP32 takes care of figuring out what day it is and moves a 9 g servo accordingly. [Jeff] wanted a little more visual action, so the pointer moves a tad bit every hour. A temperature/humidity sensor and a separate CO₂ sensor output their readings to an LCD screen mounted under the pointer. Since [Jeff] is keeping this across the basement workshop from the bench, the data is also available from a web server running on the ESP32 via XML and JSON, and the day clock can get OTA updates.

Need a little more specificity than just eyeballing a pointer? Here’s a New Times clock that gives slightly more detail.