Franke A600 coffee machine with PicoVoice

Coffee By Command: The Speech2Touch Voice Hack

September 24, 2025 by Heidi Ulrich 1 Comment

If you were to troll your colleagues, you can label your office coffee maker any day with a sticker that says ‘voice activated’. Now [edholmes2232] made it actually come true. With Speech2Touch, he grafts voice control onto a Franke A600 coffee machine using an STM32WB55 USB dongle and some clever firmware hacking.

The office coffee machine has been a suspect for hacking for years and years. Nearly 35 years ago, at Cambridge University, a webcam served a live view of the office coffee pot. It made sure nobody made the trip to the coffee pot for nothing. The funny, but in fact useless HTTP status 418 was brought to life to state that the addressed server using the protocol was in fact a teapot, in answer to its refusal to brew coffee. Enter this hack – that could help you to coffee by shouting from your desk – if only your arms were long enough to hold your coffee cup in place.

Back to the details. The machine itself doesn’t support USB keyboards, but does accept a USB mouse, most likely as a last resort in case the touchscreen becomes irresponsive. That loophole is enough: by emulating touchscreen HID packets instead of mouse movement, the hack avoids clunky cursors and delivers a slick ‘sci-fi’ experience. The STM32 listens through an INMP441 MEMS mic, hands speech recognition to Picovoice, and then translates voice commands straight into touch inputs. Next, simply speaking to it taps the buttons for you.

It’s a neat example of sidestepping SDK lock-in. No reverse-engineering of the machine’s firmware, no shady soldering inside. Instead, it’s USB-level mischief, modular enough that the same trick could power voice control on other touchscreen-only appliances.

Butta Melta Stops Rock-solid Butter From Tearing Your Toast

August 25, 2025 by Donald Papp 53 Comments

Ever ruin a perfectly serviceable piece of toast by trying (and failing) to spread a little pat of rock-solid butter? [John Dingley] doesn’t! Not since he created the Butta Melta to cozily snug a single butter serving right up against a warm beverage, softening it just enough to get nice and spreadable. Just insert one of those foil-wrapped pats of butter into the Melta, hang its chin on the edge of your mug, and you’ll have evenly softened butter in no time.

The Butta Melta is intentionally designed with a bit of personality, but also has features we think are worth highlighting. One is the way it’s clearly designed with 3D printing in mind, making it an easy print on just about any machine in no time at all. The second is the presence of the hinge point which really helps the Butta Melta conform to a variety of cup designs, holding the payload as close as possible to the heat regardless of cup shape. A couple of minutes next to a hot beverage is all it takes for the butter to soften enough to become easily spreadable.

You may remember [John] (aka [XenonJohn]) from his experimental self-balancing scooters, or from a documentary he made about domestic ventilator development during COVID. He taught himself video editing and production to make that, and couldn’t resist using those skills to turn a video demo of the Butta Melta into a mock home shopping style advertisement. Watch it below, embedded just under the page break, then print one and save yourself from the tyranny of torn toast.

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The 64-Degree Egg, And Other Delicious Variants

August 7, 2025 by Lewin Day 43 Comments

Many of us have boiled an egg at some point or another in our lives. The conventional technique is relatively straightforward—get the water boiling, drop the egg in, and leave it for a certain period of time based on the desired consistency. If you want the yolk soft, only leave it in for a few minutes, and if you want it hard, go longer.

Ultimately, though, this is a relatively crude system for controlling the consistency of the final product. If you instead study the makeup of the egg, and understand how it works, you can elicit far greater control over the texture and behavior of your egg with great culinary benefits.

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From Burnt To Brilliant: A Toaster’s Makeover

May 28, 2025 by Matt Varian 26 Comments

Appliances fail, but that doesn’t mean it’s the end for them. This impressive hack from [solopilot] shows the results possible when not just fixing but also improving upon its original form. The toaster’s failed function selector switch presented an opportunity to add smart features to the function selection and refine control over its various settings.

Before upgrading the toaster, [solopilot] first had to access its components, which is no trivial task with many modern appliances. Photos document his process of diving into the toaster, exposing all the internals to enable the upgrade. Once everything was accessible, some reverse engineering was required to understand how the failed function selector controlled the half-dozen devices it was wired to.

Next came the plan for the upgrades—a long list that included precise temperature control and the ability to send an SMS showing the state of your meal. A Raspberry Pi Zero, a solid-state relay, a relay control board, and a thermocouple were added to the toaster, unlocking far more capability and control than it had originally. Some tuning is required to fully enable these new features and to dial in the precision this once run-of-the-mill toaster is now capable of.

The work wasn’t limited to the toaster itself. [solopilot] also seized the opportunity to create an Android app with speech recognition to control his now one-of-a-kind Cuisinart. It’s probably safe to say his TOA-60 is currently the smartest toaster in the world. If you check out his documentation, you’ll find all the pinouts, circuits, code, and logic explanations needed to add serious improvements to your own toaster. We’ve featured several other toaster oven projects over the years, most of which have focused on turning them into reflow ovens, so it’s exciting to see one aimed at improving upon its original design.

A stainless steel metal toaster sits on a white table. Its cord is draped artfully around to the front and the leftmost toast holding apparatus is rotated out from the front of the device like a book pulled down and out from a bookshelf.

Flat Pack Toaster Heats Up The Right To Repair

March 2, 2025 by Navarre Bartz 89 Comments

The toaster is a somewhat modest appliance that is often ignored until it stops working. Many cheap examples are not made to be easily repaired, but [Kasey Hou] designed a repairable flat pack toaster.

[Hou] originally planned to design a repairable toaster to help people more easily form an emotional attachment with the device, but found the process of disassembly for existing toasters to be so painful that she wanted to go a step further. By inviting the toaster owner into the process of assembling the appliance, [Hou] reasoned people would be less likely to throw it out as well as more confident to repair it since they’d already seen its inner workings.

Under the time constraints of the project, the final toaster has a simpler mechanism for ejecting toast than most commercial models, but still manages to get the job done. It even passed the UK Portable Appliance Test! I’m not sure if she’d read the IKEA Effect before running this project, but her results with user testing also proved that people were more comfortable working on the toaster after assembling it.

It turns out that Wikipedia couldn’t tell you who invented the toaster for a while, and if you have an expensive toaster, it might still be a pain to repair.

A man in black glasses and a black t-shirt has his arms resting on a grey workbench. Between his opened hands are the two halves of a copper ice press. They are fist-sized copper cylinders. The lower half has large spiraling grooves to aid in the release of excess water from the ice being formed as it melts.

Make Ice Spheres In A Copper Press

March 2, 2025 by Navarre Bartz 12 Comments

Perfectly clear ice spheres are nifty but can be a bit tricky to make without an apparatus. [Seth Robinson] crafted a copper ice press to make his own.

Copper is well-known for its thermal conductivity, making it a perfect material for building a press to melt ice into a given shape. Like many projects, a combination of techniques yields the best result, and in this case we get to see 3d printing, sand casting, lost PLA casting, lathe turning, milling, and even some good old-fashioned sanding.

The most tedious part of the process appears to be dip coating of ceramic for the lost PLA mold, but the finished result is certainly worth it. That’s not to say that any of the process looks easy if you are a metal working novice. Taking over a week to slowly build up the layers feels a bit excruciating, especially compared to 3D printing the original plastic piece. If you’re ever feeling discouraged watching someone else’s awesome projects, you might want to stick around to the end when [Robinson] shows us his first ever casting. We’d say his skill has improved immensely over time.

If you’re looking for something else to do with casting copper alloys, be sure to checkout this bronze river table or [Robinson’s] copper levitation sphere.

Thanks to [DjBiohazard] for the tip!

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A man in a t-shirt and sport coat sits behind a table upon which are a small, black air fryer and a larger pale green model that looks more futuristic. Behind him is a black set of cube shelves (possibly IKEA Kallax) with different colored interiors lit and holding various bits of vintage technology equipment like landline phones and HiFi setups.

How Do Air Fryers Work?

February 27, 2025 by Navarre Bartz 64 Comments

Air fryers are the new hotness in the kitchen, but are they actually any different than a convection oven? [Technology Connections] walks us through the design of these countertop appliances to find out.

If you like your fries and chicken crispy instead of soggy, you traditionally had to eat out or spend the better part of an hour waiting on your food to cook to a crisp in the oven. Convection ovens significantly speed up this process by moving the air about and keeping the food from sucking most of the heat out of the stagnant layer just next to it.

It turns out that most air fryers are just a coil stove element and a fan placed above a basket which is just a fancy re-arrangement of the parts of a toaster or convection oven. The magic sauce here is the small size and the fact you don’t have to futz with pulling a hot wire basket out of your toaster or larger convection oven. The small size does give you a pretty big advantage in preheating and precise application of heat to the food for smaller batch sizes, but if you already have a convection oven, the advantages might not outweigh the additional space and cost of yet another kitchen gadget. We appreciate the sacrifice of eating “a lot of french fries” to test the differences between brands and conventional convection ovens for our edification.

If you’re looking for a way to make cookies faster instead of fries, how about this hack using a microwave and a heat gun? Or maybe it’s better to redesign the food instead of the appliance like this ramen in an edible package or these origami noodles.

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