Category: News

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Monitor Your Home Energy in Real Time with ESP32 and Home Assistant

Check out this wirte up by our member Christian Kortenhorst.

With energy prices climbing and smart homes becoming the norm, having a clear view of your household power usage has never been more valuable. That’s what motivated me to create a compact, real-time energy display powered by an ESP32 and a 2.8″ TFT touchscreen—fully integrated with Home Assistant for accurate, live data at a glance.

Why I Built This
I already had a power monitoring system installed through my home energy provider. While it gave a general idea of usage, it was far from ideal:

  • It only updated every 30 minutes to an hour, making real-time decision-making impossible.
  • It didn’t show live solar production, even though I had solar panels installed.
  • It lacked any visual clarity—just vague numbers with no context on where power was flowing.
  • Most importantly, there was no breakdown of grid vs solar vs battery usage. – Without opening my phone
  • Also existing power monitor does not do negative number so any feedin from solar does not show.

That’s when I realised I needed something more flexible, accurate, and immediate—custom-built to show the exact figures I cared about.

Old OWl monitor

The Hardware

Here’s what I used for this project:

  • ESP32 Microcontroller – Powerful, Wi-Fi enabled and Arduino-compatible. https://www.amazon.co.uk/dp/B0DXFBKKQB?ref=ppx_yo2ov_dt_b_fed_asin_title
  • 2.8” TFT Touch Display (320×240) – A colourful and responsive screen with touch input, perfect for compact dashboards.
  • Home Assistant – My existing setup, which already tracks energy through integrations like the Energy Dashboard or MQTT sensors. Shelly

What It Shows

The display cycles through or organises a simple dashboard view with key stats:

  • 🌞 Solar Power: Current generation in watts.
  • 🏠 Home Consumption: Real-time power draw.
  • ⚡ Grid Usage: Whether I’m importing or exporting electricity.
  • 🔋 Battery Level: Charge percentage and power flow.
  • Water temperature in boiler

These are live, accurate figures from my energy system—not delayed estimates.

How It Works
The ESP32 fetches data from Home Assistant using either its REST API or MQTT feed. I chose to parse JSON data from Home Assistant’s /api/states endpoint, which allows me to pull specific sensor values and display them on the TFT screen.

To keep it fast and responsive:

  • Sensor values update every few seconds.
  • Touch input can be added for toggling views or brightness.
  • The layout is clean, using large fonts and colour-coded elements for clarity.
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Tog Hackerspace at Security BSides Dublin 2025 – Come Pick Some Locks with Us!

We’re excited to announce that Tog Hackerspace is once again a Community Sponsor of Security BSides Dublin, taking place on Saturday, 24th May 2025, in Trinity Business School.

Security BSides Dublin is an annual information security conference run by a passionate community of volunteers. It provides a platform for infosec professionals, enthusiasts, and hobbyists to come together and share their knowledge in a relaxed, inclusive environment. Talks and workshops will explore everything from ethical hacking and digital forensics to cryptography and social engineering.

As part of our involvement this year, Tog will be hosting a lockpicking table at the event. Whether you’re brand new to physical security or a seasoned picker, drop by our table and try your hand at opening various locks with specially designed tools. Our members will be on hand to guide you through the process and talk about the fascinating overlap between lockpicking and digital security.

We’ll also be sharing more about what Tog Hackerspace has to offer—from electronics nights and coding workshops to 3D printing, laser cutting, and hardware hacking. It’s a great chance to meet our members, learn about upcoming events, and see how you can get involved in Dublin’s maker and hacker community.

See you on May 24th at Trinity!

For more info on the event, visit https://www.bsidesdub.ie

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Dublin Tech Week – May 23rd–30th

We’re thrilled to announce that Tog Hackerspace will be taking part in this year’s Dublin Tech Week, running from May 23rd to 30th, 2025!

Dublin Tech Week is a city-wide celebration of innovation, technology, and community. Its mission—to celebrate innovation, foster collaboration, inspire the next generation, and promote inclusivity—is perfectly aligned with our goals at Tog. We’re proud to open our doors and share our passion for tech and making with a series of engaging, hands-on events throughout the week.

Whether you’re a seasoned hacker or just tech-curious, we’ve got something for you:

🔭 Build Your Own Satellite Ground Station

📅 Saturday, 25th May
🕚 11:00am – 1:00pm
📍 Register here

Are you fascinated by space and want to learn how to receive data from satellites and weather probes? Join us for a TinyGS Station Workshop, where you’ll build and program your own ground station and antenna to capture real data from space.

Perfect for beginners and space geeks alike—no prior experience required. Come explore radio, electronics, antenna design, and IoT with us!

💡 Electronics, Microcontroller, and IoT Evening

📅 Monday, 26th May
🕖 7:00pm – 9:00pm
📍 Register here

Join us for our regular Monday electronics night! These informal drop-in sessions are a great way to explore microcontrollers, sensors, soldering, and all things electronic.

Newcomers are always welcome, and we’ll give you a tour of the space. Bring a project to work on, or just come by and get inspired.

🔐 Lock Picking Night

📅 Thursday, 29th May
🕖 7:00pm – 9:30pm
📍 Register here

Always wanted to learn the art of lock picking? This fun, social evening is open to everyone, whether you’re brand new or already an experienced picker. We’ll provide all the tools—you just bring your curiosity!

It’s a great opportunity to learn new techniques, meet fellow enthusiasts, and get hands-on with real locks commonly found in Ireland.

We’re delighted to be part of a week that showcases the creativity and diversity of Dublin’s tech community. Come visit us during Dublin Tech Week, meet our members, and discover what hackerspaces are all about.

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RetroFest 2025: Dive into 80s Calculators & Soviet Computing with Eduard

Tog Hackerspace member Eduard Garanskij is hitting the road again—this time to Swindon for RetroFest 2025! The event will take place in the Hawksworth Room at STEAM—Museum of the Great Western Railway, and it will run from 10 a.m. to 5 p.m. on Saturday, May 31st, and Sunday, June 1st.

Eduard’s exhibit, titled “Journey Through Time: Exploring the Legacy of 80s Programmable Calculators and Soviet-Era Computers,” will dive deep into the fascinating world of vintage Soviet computing. Visitors will get a rare chance to see how Soviet computers were built using original CPUs, often engineered for compatibility with the PDP architecture. Alongside this, Eduard will showcase iconic programmable calculators from the 1980s, offering live demos and insights into their historical context and functionality.

If you’re in the UK or fancy a retro tech weekend away, don’t miss this chance to see Eduard’s hands-on exhibit and explore the roots of Eastern Bloc computing history!

📍 Location: STEAM – Museum of the Great Western Railway, Fire Fly Ave, Swindon SN2 2EY
🗓️ Dates: Saturday 31st May – Sunday 1st June 2025

More info: retrofest.uk

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Tog at SEARG 2025 Radio Rally & IRTS AGM

We’re excited to announce that Tog Hackerspace will be hitting the road and setting up a table at the SEARG 2025 Radio Rally & Electronics Fair, taking place on Sunday, April 13th, in the Woodford Dolmen Hotel, Carlow. The rally is part of the Irish Radio Transmitters Society’s (IRTS) AGM weekend and is hosted by the South Eastern Amateur Radio Group (SEARG).

📻 Event Details
📍 Woodford Dolmen Hotel, Carlow
🗓️ Sunday, 13th April 2025
🕥 Doors open: 10:30 a.m. – 1:30 p.m.
🔗 More info on the event here

We’ll be showcasing some of our radio-related projects, electronics builds, and all things maker-y. Whether you’re into amateur radio, DIY electronics, or just curious about what goes on in a hackerspace, drop by our table and say hello!

Expect to see everything from TinyGS satellite ground stations to homebrew antenna builds and maybe even a few surprises. If you’re a fellow maker, hacker, or ham radio enthusiast, we’d love to chat and connect.

This is a great chance to meet the wider radio and electronics community in Ireland, and we’re delighted to be part of it.

Hope to see you there!

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Retro Computing & Gaming Day at TOG

Join us for an afternoon of retro computing and classic gaming as we celebrate the golden age of vintage systems and consoles! Whether you’re a long-time collector, a retro gaming enthusiast, or just curious about the technology of the past, this event is the perfect opportunity to explore and relive the magic of classic computing and gaming.

What to Expect:

Neo Geo Pocket Color: Experience the vibrant world of SNK’s handheld console, known for its rich library of 2D fighting games and unique clicky thumbstick.

Sega Saturn & Dreamcast: Immerse yourself in the legendary Sega Saturn and Dreamcast, two consoles that pushed the boundaries of gaming with innovative 3D graphics and online capabilities.

Vintage Computing Systems: A variety of classic machines will be available to explore, offering a hands-on look at the evolution of computing and gaming from the 80s and 90s.

Activities:

  • Hands-on Demonstrations: Get up close with vintage computers and consoles, testing out classic games and software.
  • Show and Tell: Bring along your own retro systems, share their history, and connect with fellow enthusiasts.

Event Details:

  • Date: Saturday, 5th April 2025
  • Time: 2:00 PM – 6:00 PM
  • Location: TOG Hackerspace
  • Cost: Free (Donations welcome via Eventbrite)

https://www.eventbrite.ie/e/retro-computing-gaming-day-at-tog-tickets-1299309201799?aff=oddtdtcreator

Want to showcase your own system? Email us to reserve a table!

Also happening at TOG: Earlier in the day, we’re hosting a Soldering Workshop! If you’re interested in learning or improving your soldering skills, check out the details and register here: https://www.tog.ie/2025/03/soldering-workshop-3/