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Today β€” 22 July 2026Main stream

A Smarter DIY Air Filter

22 July 2026 at 01:00
A vaguely perforated metal cylinder sits on a wooden box with a grey cylinder and LCD display atop it. There are holes in the top of the grey cylinder for air to flow through.

As predominantly indoor creatures, it’s important to maintain a healthy habitat for the hacker. [Kishan Pratap Singh] designed a clever solution in AirSense, an ESP32-powered air filter.

If you’re thinking of cleaning the air in your environment, you might also want to know some properties about the air coming out of the filter. AirSense measures PM2.5 dust concentration, Air Quality Index (AQI), temperature, humidity, and atmospheric pressure. The various sensors are mounted along the exhaust path of the filter, which lets your know what kind of air it’s pumping out.

The system drives a 150 mm exhaust fan mounted in a 3D printed cap that pulls air through a cylindrical Xiaomi HEPA filter inside a perforated metal trash can enclosure. The ESP32 and an LCD readout of the environmental data also live in the cap, giving the device a sleek look. While [Singh] chose to run the filter continuously, we wonder if it might be interesting to set it up to only filter the air if air quality drops below a certain level to conserve power, especially if you’re on a time-of-use power plan. That would require redesigning the sensor assembly (or running the unit in reverse), so maybe it’s over-complicating things?

We’ve seen the Xiaomi Air purifier filter mentioned before, but under the auspices of hacking it’s filter DRM, an open source air filter designed by [Naomi Wu], and even an ESP32 pressed into service to plug an air purifier into Home Assistant.

Yesterday β€” 21 July 2026Main stream
Before yesterdayMain stream

The tiny smart home sensor that everyone should have (even if you don’t have a smart home)

20 July 2026 at 13:08

You can fill your home with sensors that measure things like temperature, humidity, whether you left the garage door open, and who’s at home. Valuable as these are, there’s one sensor that stands head and shoulders above the rest in terms of the amount of money and hassle it can save you.

I ditched smart bulbs for $25 presence sensorsβ€”and my wallet thanks me

19 July 2026 at 11:00

Smart bulbs are a common gateway into the world of smart home devices. Setting one up is as simple as screwing in a light bulb, and you get instant results with the ability to turn your lights on and off remotely, change the brightness, and even use different colors with the right bulbs. Smart bulbs aren't always the best solution to every problem, however.

Ditch the Ring subscriptionβ€”open-source Frigate keeps your security cameras smart, free, and local

18 July 2026 at 13:00

Ring video doorbells are a popular choice as they're relatively affordable and simple to set up and use. The problem is that to use the best features of a Ring doorbell, such as accessing your video history, you need to pay for a subscription. If you don't want to keep paying to use a device you already bought, there is another option.

Effortlessly clean your pool this summer with Beatbot’s robotic pool cleaners

By: Sponsored
18 July 2026 at 08:50

Summer is the perfect season for outdoor fun, especially if you have a pool and plan on hosting friends and family. This year, entertaining feels even grander with the FIFA World Cup happening alongside classic backyard barbecues. While you're busy preparing, the last thing you want to worry about is a dirty pool. Luckily, Beatbot has you covered with its smart, hands-free pool maintenance devices, and now many of its top models are discounted during its Backyard Bash Sale. So, you can pick up a robotic pool cleaner more affordably.

5 genuinely useful ways to use the serial port on the back of your TV

18 July 2026 at 08:00

If you look at the back of your TV, there are many ports that you probably never use. Some older TVs include an RS-232 serial port similar to those that you'd find on the back of old PCs. While the main uses of this port include professional diagnostics and servicing, there are several ways you can use your TV's serial port for other things.

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