Homebrew Ball Drop Machine Rings In The New Year

February 10, 2023 by Lewin Day No comments

The New Year’s Ball Drop in New York City stems from an old English naval tradition. These days, it’s more of a celebratory thing, and [Jon Gonzalez] wanted to bring a bit of that joy to his own celebrations. Thus enter the Ball-Drop-O-Matic 3000.

The ball itself consists of two 3D printed halves assembled together with a linear bearing in the middle. It’s loaded up with a ton of addressable LEDs to give it plenty of flash, pomp, and circumstance as it rides down the flagpole. Animations are coded in to the K-1000C display controller using LEDEdit2014, an older piece of software which can turn Flash animations into commands to run WS2812B LED strips.

Lowering the ball is handled by a motorized winch. The winch is mounted at the base of the flagpole for aesthetic reasons, with the cable travelling up to the top of the pole, over a pulley, and back down to the ball. The descent speed is set to countdown the last minute of the year, with numbers animated on the ball itself.

The build was clearly a great addition to [Jon’s] New Years celebrations, even if it wasn’t quite finished until 9:35 PM on the big night. We’ve seen other fun ball drop builds before, too.

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Simple Wood-Fired Water Heater Is Surprisingly Effective

February 8, 2023 by Lewin Day 55 Comments

These days, humans have gotten all fancy-schmancy with their gas and electric water heaters. Heck, some are even using heat pumps to do the work as efficiently as possible. [HowToLou] got back to basics instead, with his simple wood-fired water heater design.

The design is straightforward, featuring 100ft of quarter-inch copper tubing wrapped directly around a steel barrel. Room-temperature water is fed into the tubing via a garden hose, and comes out much hotter, thanks to a fire burning away in the barrel stove of [Lou’s] own construction.

For an input water temperature of 41 F, the output reaches 105 F at a flow rate of 0.67 gallons per minute. By [Lou]’s calculations, that’s a heat transfer to the water of roughly 21,000 BTU per hour. [Lou] achieved this with just $55 worth of copper tubing, and he notes that simply doubling up the tubing would increase the heat transfer to the water even further.

If you’re looking for a hot shower from your outdoor wood stove, a build like this might be just the ticket. With the stove burning hot and your hose as a water supply, you could experience the joy of the hot water while you’re standing in the snow outside. We’ve seen [Lou]’s work before, too. Video after the break.

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Model Train Delivers Fresh Coffee

February 8, 2023 by Lewin Day 25 Comments

Model trains are good fun, though few of them serve any purpose beyond amusement or authentic railway simulation. [ProjectAir] decided to put his model train to practical use by having it deliver fresh espresso, and faced plenty of difficult challenges along the way.

It sounds simple, but the practicalities of the task proved difficult. After all, even a slight wobble is enough to tip a coffee cup off a small train. Automating everything from the railway itself to the kitchen coffee machine was no mean feat either. Plus, the aim was to deliver coffee from a downstairs kitchen up to an upstairs office. This meant finding a way to get the train to climb a steep staircase and to carry the coffee over a 20-meter journey without losing the caffeinated beverage in the process. That required the construction of a fancy train elevator to do the job — an impressive accomplishment on its own.

The final system is a joy to watch. Having a train roll into the upstairs workshop with a fresh brew certainly beats having to go all the way downstairs for a cup. Just don’t think about the fact that moving the coffee machine upstairs might have been a quicker solution.

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Now ChatGPT Can Make Breakfast For Me

February 2, 2023 by Jenny List 61 Comments

The world is abuzz with tales of the ChatGPT AI chatbot, and how it can do everything, except perhaps make the tea. It seems it can write code, which is pretty cool, so if it can’t make the tea as such, can it make the things I need to make some tea? I woke up this morning, and after lying in bed checking Hackaday I wandered downstairs to find some breakfast. But disaster! Some burglars had broken in and stolen all my kitchen utensils! All I have is my 3D printer and laptop, which curiously have little value to thieves compared to a set of slightly chipped crockery. What am I to do!

Never Come Between A Hackaday Writer And Her Breakfast!

OK Jenny, think rationally. They’ve taken the kettle, but I’ve got OpenSCAD and ChatGPT. Those dastardly miscreants won’t come between me and my breakfast, I’m made of sterner stuff! Into the prompt goes the following query:

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Cheap Kitchen Scale Learns To Speak JSON With ESP32

February 2, 2023 by Jenny List 5 Comments

Smart kitchen appliances are expensive, and more often than not, your usage data goes to whichever company operates the inevitable cloud service. Meanwhile the cheap ones contain substantially the same components without the smarts, so surely a hardware hacker can add a microcontroller to a cheap appliance for a bit of smart home technology without the privacy issues? It’s something [Liore] has done with an Amazon Basics kitchen scale, removing the electronics and wiring up an ESP32 to the load cell instead.

The Wheatstone bridge load cell circuit generates a tiny voltage difference that’s far too small for an ESP32 to measure, so in between the pair is an Avia Semiconductor HX711 strain gauge amplifier module. In addition, there’s a small OLED screen and the two buttons used in the Amazon scale are wired in too, providing the the kitchen scale functionality you’d expect.

Naturally the ESP32 brings along with it WiFi networking capabilities, which [Liore] has taken full advantage of here. By navigating a web browser to its IP address, you’ll receive the scale’s current reading in JSON format. This should make it easy to integrate with other systems, from Home Assistant to OctoPrint. We can see that there is plenty of scope for further enhancements for those prepared to write a little code.

Of course, this isn’t the first enhanced scale we’ve brought you, here’s one with Bluetooth. We’ve also seen hackers dispense with the kitchen-safe trappings and build the load cell directly into their own contraptions.

A desktop weather display, with two yellow pointers, one for the time frame (Now, 3hr, 6hr, 12hr, 24hr, 48hr) and the other pointing to an iconographic description of the weather (sunny, cloudy, cloud with rain, cloud with lightning, snowflake and fog)

Let This Minimal Desktop Weather Display Point The Way

January 31, 2023 by Abe Connelly 7 Comments

Much of the Northern Hemisphere is currently in the middle of winter, so what better way to brighten a potentially gloomy day than to put this charming, minimalist weather display on your desk.

[Joe] has created a weather gauge that uses two servo motors to position mechanical pointers to indicate weather symbols and time ranges. The electronics consists of a push button and two SG90 servos driven by a Raspberry Pi Zero W 2. The case is 3D printed including the pointers attached to the servos and the button brim of the switch. The Raspberry Pi Zero W 2 is programmed to automatically connect to the OpenWeather API to retrieve the latest weather conditions, with the latitude and longitude being configured into the update script during the configuration and assembly stages.

[Joe] has provided extensive documentation about the build and software setup, in addition to releasing the source code and STL files for anyone wanting to make their own. [Joe] even offers kits for those who don’t want to go through the trouble of putting one together themselves — not that we imagine many in this particular audience would fall into that category.

We love to see these delightful weather builds and we’ve featured others in the past, like a converted weather house for weather prediction or a weather reporting diorama.

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Converting A Sink To An Ultrasonic Cleaner

January 30, 2023 by Bryan Cockfield 40 Comments

While ultrasonic cleaning might sound a bit like the “sonic shower” from Star Trek, this is actually one case where the futuristic-sounding technology predates its use in Sci-Fi. Ultrasonic cleaners have been around since the 50s and are used to clean all sorts of oddly-shaped or specialty objects by creating cavitation within a liquid that allows the surface of the object to be scoured. With the right equipment, these cleaning devices are fairly straightforward to build as well.

This ultrasonic cleaner by [Branchus Creations] started off as a standard stainless steel laundry sink, but with the addition of a few transducers it really turns up the volume. They are attached to the underside of the sink with a combination of a bolt and hard epoxy so that the sound is efficiently transmitted to the sink, but they’re not much use without driver boards to power them. These drivers take AC power and convert it to the DC required to generate the ultrasonic frequencies, and this build uses a driver for each of the transducers all wired up to a common control board for ease-of-use.

The results speak for themselves; a test is performed on a sheet of aluminum foil which quickly turns takes on a Swiss cheese appearance after just a couple minutes in the cleaner. It’s also shown cleaning rusty nails and a few other things as well. For other nontraditional cleaning methods, be sure to check out this wet media blast cabinet built from a 55-gallon drum.

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