home-assistant

66 Articles

Smarting Up A Doorbell With Zigbee

August 19, 2026 by 12 Comments

Once upon a time a doorbell was little more than a button, a transformer, and a bell tucked somewhere around the house. These days, they get a little bit fancier. [Philipp Schweizer] has recently been exploring how to turn existing dumb doorbells into smarter ones.

The build is based around a wired doorbell setup, in particular, a Vistadoor ADV-100. [Philipp] was able to find a simple place to tap in to a signal that went to 5 V when the doorbell was rung. He wanted to hook this into his smart home system as easily as possible. Thus, he grabbed a rather unique part—the ESP32-H2. This is notable in the ESP32 family for having no WiFi connectivity. What it does have, however, is an 802.15.4 radio good for Thread and Zigbee communications.

[Phillip] explains that hooking the ESP32-H2 up to fire a notification to Home Assistant every time the doorbell goes off is easy—and it doesn’t mess with the standard doorbell’s chiming behavior one bit. He also explains how to set up neat automations, such as having a separate smart camera capture an image when the door bell is fired.

If you’re looking to integrate an existing doorbell into your Home Assistant setup, this project could be just what you need. We’ve featured some other neat doorbell builds too, like this touchless design from the dark days of the coronavirus pandemic.

A Complex Way To Push A Button

July 31, 2026 by 17 Comments

We’ve likely all looked at a simple problem in our lives and thought that it would be an easy fix, only to realize that the project is enormously more complicated than we first realized. Whether that’s starting a home improvement project, doing a quick repair to a bicycle or car, or trying to install an obscure piece of software on a Linux machine, the amount of time we budget for these tasks often ends up woefully underestimated. [Oscar]’s night light needs to have its brightness set every night, and it seems easy enough to get a microcontroller to automate that, right?

Well, upon opening the small device, the first issue is that there is no labeling on any of the parts, so simply adding a jumper on to existing microcontroller pins without damaging anything wouldn’t easily be possible. Adding a secondary microcontroller is the next logical step, but the power supply in the night light is extremely underpowered so using even the smallest Raspberry Pi or off-the-shelf Arduino was out of the question too. [Oscar] instead chose an ATtiny85, which solves the power requirement issue, but these are a bit more of a challenge to program without a USB device. From there, it needs a transistor wired in to the circuit to actually push the button for him, plus a few support resistors, so [Oscar] actually had a PCB custom-built to hold all of these components.

Even after all of that, the space within the night light enclosure made installing the PCB a challenge, but in the end he has a device which, when his home automation system powers on the plug for the nightlight, automatically boots up and pushes the switch the required number of times and then puts itself to sleep. We’d call that a success even after the colossal effort getting this inexpensive, small light working the way he wanted. There are some other low-powered solutions for problems like these too, as long as being battery-powered isn’t a dealbreaker.

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.

A Smarter DIY Air Filter

July 21, 2026 by 25 Comments

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.

Modern E-Ink Dashboards, Kindle And Otherwise

July 3, 2026 by 13 Comments

People have been attempting to turn Kindles into more than e-readers since the first devices came out nearly two decades ago. The e-ink displays are low-power and great for displaying information that doesn’t refresh too often, and with Amazon continuing their trend of bricking their older devices there will be more of these devices available. [Hemant] built a weather dashboard with one of his, but since then had requests for other types of e-reader dashboards and has a guide for making more general-purpose use of an old Kindle.

The first approaches outlined here involve the installation of a dashboard client on the Kindle and pointing it at a server that hosts a PNG image of whatever information needs to be displayed. The client simply displays that image and refreshes it at predetermined intervals. There are a number of options for creating that server as well, including using Home Assistant for those who already have a home automation system deployed. The benefit of using Home Assistant is that it’s much more straightforward to gather data for the dashboards from sensors and other peripherals that are already installed.

Installing a client like this might seem straightforward, and it can be, provided that the Kindle involved is jailbroken or capable of being jailbroken. An Amazon update recently broke many modern devices’ ability to execute the jailbreak, so not every Kindle can do this anymore. But [Hemant] goes into detail about this and also outlines some methods for using generic e-ink displays instead, and also dives into the hardware and software behind building a server to host the dashboard images for those without Home Assistant already running. It’s a great overview for those who have always wanted something like this but never knew where to start.

RF Hacking A Ceiling Fan Via The Remote

June 28, 2026 by 16 Comments

[Sam Wilkinson] recently installed a Dreo CLF513S ceiling fan in his place — it’s cheap, well-sized, and blows air around as you’d expect it to. The only problem is that it only works with an ugly cloud-only smart home setup out of the box. Never mind, though, because [Sam] figured out how to hack up a custom solution.

Hacking efforts began with the included remote control. [Sam] identified that the remote had to be RF, since it didn’t need line of sight to work properly. The FCC ID on the back of the device further indicated this was the case. Armed with that knowledge, it was simply a case of figuring out the commands sent by the remote, building something to replay them, and then hooking that into [Sam]’s existing Home Assistant setup.

The remote ran on 433.92 MHz, a not-uncommon bit of spectrum for these sort of appliances. An RTL-SDR was thusly enlisted to capture the output, with a spectrogram indicating the remote used simple on-off keying to send commands. Once commands were captured, [Sam] grabbed an ESP32-C6 microcontroller, hooked it up to a RFM69HCW radio transceiver, and programmed it to replay the fan on/off command. From there, a little dabbling with MQTT got the ESP32 controlling the fan as desired from within the Home Assistant ecosystem.

Sometimes, it’s hard to find smart home gear that actually suits your tastes and budgets. Often, a bit of tinkering can shape existing appliances to bend to your will instead. If you’re tweaking your own gear to better fit your smart home, don’t hesitate to notify the tipsline.

The turntable in question, or at least the same model.

Vintage Turntable Gets Brain Transplant And Home Assistant Integration

June 5, 2026 by 10 Comments

When [Marsupial] picked up a vintage Sansusi P-L45 turntable, he figured it would be an easy fix: a few capacitors, a belt or two, and maybe a new cartridge, the usual. But it turned out the electronics were fried, which set the stage for an upgrade that turned it into what may be the world’s only ESP32-driven, Home Assistant integrated, linear tracking turntable.

That last bit, the linear tracking, is why the turntable originally had a microprocessor in the first place: rather than an arm that pivots along the groove naturally, fancy turntables towards the end of the golden era of vinyl slid the needle along a linear track at a variable speed to follow the spiral groove on the record. You can see that in action in the demo video below, though it’s of a working version owned by [BFinks].

The fancy linear mechanism required electronic control to match the speed to the RPM, and in the example of Sansusi’s P-L45, that was provided by an NEC microcontroller on a daughter-board labelled “F4992 CPU”. CPU is a grandiose title, perhaps, but that’s irrelevant since the chip on the board was deader than disco.

That meant [Marsupial] had some reverse engineering to do — figuring out exactly what that chip did to drive this board, in order to replicate its behavior on an ESP32-S3. Luckily the golden era of vinyl correlated with the golden era of service manuals, and the manuals are still available, so [Marsupial] had a big leg up on that. After making the turntable work like stock, what else to do with the extra capability of the ESP32 than plug it into HA and make it really automatic?

Of course it wasn’t quite that easy: a new daughter-board was created that needed to do level shifting to the ESP32’s modern 3.3 V logic as well as hardware debounce on some inputs. The whole saga is very well documented on [Marsupial]’s blog WeAreAllGeeks. The link here takes you to the overview, but he’s got a lot more info on other pages — and of course links to the firmware and PCB design if you happen to have a Sansusi turntable in need of a brain transplant.

Vinyl lovers will appreciate this project much more than the last ESP32 “turntable” we featured, which was anything but. If you want to get into records but don’t have a turntable, you can always make your own.

Continue reading “Vintage Turntable Gets Brain Transplant And Home Assistant Integration” →

Adding Capabilities To Inexpensive Solar Modules

May 15, 2026 by 10 Comments

Solar power has gotten cheap enough that putting up panels is among the cheapest ways of providing energy. This isn’t just the case for bulk electricity on a power grid, either; even small devices are easier and cheaper to power with solar than ever before. For example, landscape lighting which once relied on 12V or 24V DC wires all over one’s yard with a transformer and power supply hidden somewhere have partially been converted to simpler individual solar-powered lights now. These small devices can also be given additional capabilities as [Mauro] demonstrates.

In this case, [Mauro]’s goal was to add on-demand lighting to a solar-powered light which was otherwise motion-activated only. To do this, they added a NRF24L01+ radio inside the light’s housing paired with an STM32 microcontroller. This secondary system is largely separated from the existing control circuitry with the exception of being able to switch the lights and receiving its power from the same solar panel. [Mauro] also created a small library to help with communicating with these new modules, whether that’s using a home automation system like Home Assistant or some other method.

Although adding in a few capabilities to inexpensive solar lighting might seem simple on the surface, a project like this is a gateway to adding in all kinds of interesting features to things with built-in solar panels and lots of free space in their cases. The best example here is the addition of a Meshtastic node to one of these lights, making it convenient and stealthy, but we could also see adding in other remote hardware to a landscape lighting module like a gate sensor or a plant health monitoring system.