While 3D printers have evolved over the past two decades from novelties to powerful prototyping tools, the amount of support systems have advanced tremendously as well. From rudimentary software that required extensive manual input and offered limited design capabilities, there’s now user-friendly interfaces with more features than you could shake a stick at. Hardware support has become refined as well with plenty of options including lighting, ventilation, filament recycling, and tool changers. It’s possible to automate some of these subsystems as well like [Caelestis Workshop] has done with this relay control box.
This build specifically focuses on automating or remotely controlling the power, enclosure lighting, and the ventilation system of [Caelestis Workshop]’s 3D printer but was specifically designed to be scalable and support adding other features quickly. A large power supply is housed inside of a 3D printed enclosure along with a Raspberry Pi. The Pi controls four relays which are used to control these various pieces hardware along with the 3D printer. That’s not the only thing the Pi is responsible for, though. It’s also configured to run Octoprint, a piece of open-source software that adds web interfaces for 3D printers and allows their operation to be monitored and controlled remotely too.
With this setup properly configured, [Caelestis Workshop] can access their printer from essentially any PC, monitor their prints, and ensure that ventilation is running. Streamlining the print process is key to reducing the frustration of any 3D printer setup, and this build will go a long way to achieving a more stress-free environment. In case you missed it, we recently hosed a FLOSS Weekly episode talking about Octoprint itself which is worth a listen especially if you haven’t tried this piece of software out yet.
Rejoice, those of us who have purchased a Nice-Power lab PSU from an Eastern source. Yes, the name might sound like a re-brand of a generic product, maybe you will even see this exact PSU on a shelf at a physical store near you, under a more local brand name and with a fair markup. Nevermind the circumstances, the most important part is that [Georgi Dobrishinov] found a way to add an ESP8266 to the PSU by tapping its internal UART control interface, and wrote a web UI for all your Internet-of-Lab-PSUs needs, called the PowerLinkESP project.
All you need is a Wemos D1 development board, or any other ESP8266 board that has UART pins exposed and handles 5 V input. [Georgi] brings everything else, from pictures showing you where to plug it in and where to tap 5 V, to extensive instructions on how to compile and upload the code, using just the Arduino IDE. Oh, and he tops it off with STLs for a 3D printed case, lest your Wemos D1 board flop around inside.
With [Georgi]’s software, you can monitor your PSU with interactive charts for all readings, export charts in both PNG and CSV, and access a good few features. Your ESP8266’s network uplink is also highly configurable, from an STA mode for a static lab config, to an AP mode for any on-the-go monitoring from your phone, and it even switches between them automatically! The firmware makes your PSU all that more practical, to the point that if you’re about to build an interface for your PSU, you should pay attention to [Georgi]’s work.
Lab PSUs with WiFi integration are worth looking into, just check out our review of this one; smart features are so nice to have, we hackers straight up rewrite PSU firmware to get there if we have to. Oh, and if you ever feel like standardizing your work so that it can interface to a whole world of measurement equipment, look no further than SCPI, something that’s easier to add to your project than you might expect, even with as little as Python and a Pi.
[Markus] grabbed an ESP32 and created a good-looking e-ink dashboard that can act as a status display for Home Automation. However, the hardware is generic enough that it could work as a weather station or even a task scheduler.
The project makes good use of modules, so there isn’t much to build. A Waveshare 2.9-inch e-ink panel and an ESP32, along with a power supply, are all you need. The real work is in the software. Of course, you also need a box to put it in, but with 3D printing, that’s hardly a problem.
Well, it isn’t a problem unless — like [Markus] — you don’t have a 3D printer. Instead, he built a wooden case that also holds notepaper.
The software uses ESPHome to interface with Home Assistant. There is a fair amount of configuration, but nothing too difficult. Of course, you can customize the display to your heart’s content. Overall, this is a great example of how a few modular components and some open-source software can combine to make a very simple yet useful project.
There are many ways to use an ESP32 in your home automation setup. Maybe you can salvage the e-ink displays. Just try not to get carried away.
Home automation is huge right now in consumer electronics, but despite the wide availability of products on the market, hackers and makers are still spinning up their own solutions. It could be because their situations are unique enough that commercial offerings wouldn’t cut it, or perhaps they know how cheaply many automation tasks can be implemented with today’s microcontrollers. Still others go the DIY route because they’re worried about the privacy implications of pushing such a system into the cloud.
Seeing how many of you were out there brewing bespoke automation setups gave us the idea for this year’s Home Sweet Home Automation contest, which just wrapped up last week. We received more than 80 entries for this one, and the competition was fierce. Judging these contests is always exceptionally difficult, as nearly every entry is a standout accomplishment in its own way.
But the judges forged ahead valiantly, and we now have the top three projects which will be receiving $150 in store credit from the folks at DigiKey.
The judges ultimately gave the top spot to this automation project from [stefan.schnitzer], which stands out by being designed around the Supervisory Control and Data Acquisition (SCADA) concept that’s most commonly used to control industrial processes. This multi-level hierarchy separates the lowest level “field devices” such as environmental sensors and stepper motors for operating valves from the upper level supervisory devices, which in this case are Raspberry Pis which host a visually striking HTML user interface that can be accessed from tablets or smartphones.
The documentation for this build goes back several years, and it’s fascinating to read through how different devices were brought onto the system. The interoperability with OctoPrint, allowing the home automation display to show variables such as extruder temperature and time remaining, was a particularly nice touch.
In an extremely close second is the awe inspiring automation system built up by [Bernard Kerckenaere] over the last 15 years. While the project wasn’t documented in real-time (to be fair, Hackaday.io didn’t exist in 2009), [Bernard] does an impressive job of explaining the origins of his system and bringing us up to speed on how things were built out over the years.
It all starts with two kilometers of CAT6 being pulled throughout the house, with a total of 164 individual runs. Just 22 of those are used for TCP/IP networking, the remaining 122 are used to carry power and data to sensors and devices all over the house using RS-485. Each 24-port patch panel contains four Arduinos in custom PCBs to act as intermediates between all of the downstream devices and the Raspberry Pi which runs the whole show.
By his final tally, the system includes more than 30 individual sensors, 8 thermostats, 29 lights, 3 dimmers, 17 wall sockets, 6 blinds, two electronically locked doors, plus the garage door. Oh, and there’s a centralized audio system that pumps tunes from the media server out to 10 speakers through 5 amplifiers. [Bernard] is definitely putting every meter of that CAT6 to good use in this system.
Compared to the massive whole-house undertakings that battled it out for the top two spots, this cute little bot might seem a bit out of place. But the judges were all all blown away by the incredible documentation [M. Bindhammer] put together for this project to help with their medication schedule.
Technically speaking, just the robot’s central rotary mechanism could have gotten the job done. But the hope is that this more anthropomorphic dispenser, complete with an OLED display for a face and a speech synthesis module, can make a daily medication regimen a little more pleasant. There’s a clear application here for elderly patients who may require more frequent reminders about when and why they need to take their medicine.
As usual, we had a few special categories for this contest. In addition to their base numerical rating, the judges were told to keep an eye out for projects they felt best exemplified the spirit of each one.
Comfort is key in making where you live truly feel like home, so the Smart Apartment Ventilation system from [Nik Reitmann] was a perfect choice for this category.
While he did have the ability to manually control the ventilation system in his apartment, [Nik] wanted to automate it so it would bring in fresh air in the mornings and evenings as a mater of routine, and also kick on anytime the temperature started to get too high indoors. But being an apartment, he couldn’t exactly rip out the old system — whatever he did had to be removable and make no permanent changes to the integrated system.
By reverse engineering the ventilation controller’s front panel, he was able to sneak an ESP8266 into the mix and take control of the system as if the buttons were being pressed physically. He was even able to pull power from the wall mounted panel, so there’s no addition wiring needed. With the new electronics housed in a 3D printed enclosure that surrounds the original unit, it makes for an exceptionally clean installation.
Due to an unstable local electrical infrastructure, [Rogan Dawes] was looking to maximize the effectiveness of his home solar system. Noting that one of the biggest energy drains was the water heater, the goal of this project was to automate the unit so it would adjust the target temperature of the water depending on the current power situation. For example, if the grid is functioning and there’s ample power, the water heater will be set to its maximum temperature. But if the house is running on battery power, the temperature will be lowered to conserve energy.
In terms of hardware, [Rogan] is using a Sonoff THR320 to control the resistive element in the heater, and an ATTiny85 to read the current temperature via a thermistor. The status of the home’s electrical system was already being monitored through the inverter, so all that was left to do was pull everything together within Home Assistant.
While there’s something to be said for keeping things simple, it’s no secret that we’re big fans of the convoluted here at Hackaday. If there’s a more complex way to do something, we’re all about it. This automatic chess clock from [Mykolas Juraitis] is a particularly fine example. Not everyone needs a CUDA-enabled chess clock running on a NVIDIA Jetson Orin Nano, but if you’re the kind of person who takes their game seriously, you’ll certainly appreciate its features.
The speedy single-board computer, specifically designed for machine learning applications, powers both voice and image recognition software. You can operate the clock using fairly complex voice commands, and thanks to OpenCV, it’s able to track the process of the game and run it through a chess engine to determine who’s currently winning.
With energy costs on the rise, it’s becoming more important than ever to keep a close eye on your home’s utilization. But what if your home isn’t tied down to one spot, and there’s no permanent grid wiring to tap into?
That was the unique situation that [Tom Goff] had to face when his father-in-law asked him if there was a way he could see how much energy his RV was using when plugged in at the camp site. This called for a system that could be easily removed and installed, was robust enough to handle life on the road, and of course, capable of safely handling 230 VAC.
The resulting device does the heavy lifting with an ESP32 and a PZEM-004T electrical energy monitor module, with an OLED display to show information on the front panel. But the real killer feature here is the Bluetooth connection, which is tied to a smartphone application. This lets the user check their current energy consumption without having to go physically look at the box.
While it was designed for RVs and mobile homes, it’s not hard to see how the electronics could be used to monitor the energy usage back at home. You wouldn’t technically need the heavy duty enclosure in that case, but it does make the installation look that much more professional.
Finally, we have the Smart Underfloor Heating Controller from [Red Tuka]. This impressively engineered upgrade adds remote control capabilities to an existing warm water heating system by operating the dozen valves which direct water throughout the house.
This is accomplished with twelve MOSFETS, which are in turn connected to the board’s ESP8266 via a MCP23017 I2C I/O expander. In addition, for each valve there’s also a DS18B20 temperature sensor that connects up along the right-hand side of the board. While there’s a lot happening on this one PCB, [Red] did an excellent job of keeping it all orderly, and we especially like the status LEDs for the valve MOSFETS.
Didn’t get time to enter this contest? Is home automation not your thing? No worries — this is just the first of many contests we’ll be running in 2024. We promise there will be plenty of opportunities to get some free parts out of the fine folks at DigiKey over the year is over.
Stay tuned to Hackaday for the announcement of our next contest shortly.
While there’s still something undeniably cool about the flip-open communicators used in the original Star Trek, the fact is, they don’t really look all that futuristic compared to modern mobile phones. But the upgraded “combadges” used in Star Trek: The Next Generation and its various large and small screen spin-offs — now that’s a tech we’re still trying to catch up to.
As it turns out, it might not be as far away as we thought. A company called Vocera actually put out a few models of WiFi “Communication Badges” in the early 2000s that were intended for hospital use, which these days can be had on eBay for as little as $25 USD. Unfortunately, they’re basically worthless without a proprietary back-end system. Or at least, that was the case before the Combadge project got involved.
Designed for folks who really want to start each conversation with a brisk tap on the chest, the primary project of Combadge is the Spin Doctor server, which is a drop-in replacement for the original software that controlled the Vocera badges. Or at least, that’s the goal. Right now not everything is working, but it’s at the point where you can connect multiple badges to a server, assign them users, and make calls between them.
It also features some early speech recognition capabilities, with transcriptions being generated for the voices picked up on each badge. Long-term, one of the goals is to be able to plug the output of this server into your home automation system. So you could tap your chest and ask the computer to turn on the front porch light, or as the documentation hopefully prophesies, start the coffee maker.
There hasn’t been much activity on the project in the last year or so, but perhaps that’s just because the right group of rabid nerds dedicated developers has yet to come onboard. Maybe the Hackaday community could lend a hand? After all, we know how much you like talking to your electronics. The hardware is cheap and the source is open, what more could you ask for?
Power distribution units, as the name implies, are indispensable tools to have available in a server rack. They can handle a huge amount of power for demands of intensive computing and do it in a way that the wiring is managed fairly well. Plenty of off-the-shelf solutions have remote control or automation capabilities as well, but finding none that fit [fmarzocca]’s needs or price range, he ended up building his own essentially from scratch that powers his home automation system.
Because it is the power supply for a home automation system, each of the twelve outlets in this unit needed to be individually controllable. For that, three four-channel relay boards were used, each driven by an output on an ESP32. The ESP32 is running the Tasmota firmware to keep from having to reinvent the wheel, while MQTT was chosen as a protocol for controlling these outlets to allow for easy integration with the existing Node-RED-based home automation system. Not only is control built in to each channel, but the system can monitor the power consumption of each outlet individually as well. The entire system is housed in a custom-built sheet metal enclosure and painted to blend in well with any server rack.
Adding a system like this to a home automation system can simplify a lot of the design, and the scalable nature means that a system like this could easily be made much smaller or much larger without much additional effort. If you’d prefer to keep your hands away from mains voltage, though, we’ve seen similar builds based on USB power instead, with this one able to push around 2 kW.
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