Concrete Table Just the Way You Like It

You need a coffee table, you need a dinner table. Do you really need two tables? [Shua] thinks the answer is “no”. That’s why he built this swinging countersink table out of concrete and a aluminum.

He started by making a simple half-scale prototype. Then a larger one. Through these explorations he learned how the table would be made, what kind of weight it needed, and how the mechanics needed to be constructed for the most stable table top.

Next he designed the final table in Autodesk Revit. This is software traditionally used for architecture. Since the table was to be made from concrete Revit’s useful set of concrete tools were useful for this project.

Most of the construction process was pretty standard. However, the use of CNC’d pink insulation as a mold for the concrete was interesting. The foam is closed cell, so it worked fine and gave a nice finish. The assembly was finished with a glass top and a carpeted base that contained a surge suppressor and two outlets. The table can be seen swinging between two positions in a video after the break.

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When the Smart Hits the Fan

A fan used to be a simple device – motor rotates blades, air moves, and if you were feeling fancy, maybe the whole thing oscillates. Now fans have thermostats, timers, and IR remotes. So why not increase the complexity by making a smart fan with an IoT interface?

[Casper]’s project looks more like a proof of concept or learning platform than a serious attempt at home automation. His build log mentions an early iteration based on a Raspberry Pi. But an ESP8266 was a better choice and made it into the final build, which uses an IR LED to mimic the signals from the remote so that all the stock modes of the fan are supported. The whole thing is battery powered and sits on a breadboard on top of the fan, but we’ll bet that a little surgery could implant the interface and steal power internally. As for interfaces, take your pick – an iOS app via the SmartThings home automation platform, through their SmartTiles web client, or using an Amazon Echo. [Casper] mentions looking into MQTT as well but having some confusion; we’d suggest he check out [Elliot Williams]’ new tutorial on MQTT to get up to speed.

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Tiling your TV Remote

The Tile is a small Bluetooth chip, speaker, and enough battery for a year in a keychain format. If you lose your keys in the morning, simply use the app on your phone to find the keychain. If you lose your phone simply get out your second phone.

This planned obsolescence didn’t jive with [JM] when his Tile stopped being discoverable. He didn’t want to toss a gadget that had served him so well into the landfill. So, like any good hacker, he cracked its plastic case open.

The Tile itself is a really interesting product. The largest component is the battery which has tabs spot-welded to its surface. Attached to those is a well laid out board. [JM] points out the clever use of spring contacts to engage the piezo element for the speaker as a nice example of good design for manufacture.

The hack itself was pretty easy to complete. Some electrical tape and soldering was all it took to embed the tile into the remote. Now he can take out his phone and press a button to hear a forlorn beep coming from under the couch cushions.

Reverse Engineer Your Robot Lawnmower

Your home is your castle, and you are king or queen of all you survey. You’ve built your own home-automation system from scratch. Why would you possibly settle for the stock firmware in your robotic lawnmower? [Daniel Wiegert] wouldn’t either, so in Project Landlord he has started to reverse-engineer it.

You can hardly blame him. The Worx Landroid‘s controller board uses an NXP LPC1768 ARM Cortex-M3, and the debug pins are labelled on the backside. The manufacturer didn’t protect the flash memory. It’s just begging to have its firmware dumped. So far, [Daniel] has managed to both brick and unbrick the device, and has completely mapped the controller’s pinout, so he’s on his way to complete control.

Right now, he’s got a working proof-of-concept firmware on his GitHub that’s able to drive the machine around a little bit and set the brakes. It’s running FreeRTOS, and [Daniel] is looking for other people to get in on the project. He’s done the hard initial work, so get in there and reap the rewards! Just don’t neglect to remove the blade before custom firmware.

Will custom firmware in a robotic lawnmower change the world? Probably not. But it is awesome, and will certainly make a difference in the lives of people whose robot mowers continually get stuck behind the hydrangeas.

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Carbon Monoxide: Hunting a Silent Killer

Walt and Molly Weber had just finished several long weeks of work. He was an FBI agent on an important case. She had a management job at Houghton Mifflin. On a sunny Friday evening in February of 1995, the two embarked on a much needed weekend skiing getaway. They drove five hours to the Sierra Mountains in California’s Mammoth Lakes ski area. This was a last-minute trip, so most of the nicer hotels were booked. The tired couple checked in at a lower cost motel at around 11:30pm on Friday night. They quickly settled in and went to bed, planning for an early start with a 7am wakeup call Saturday morning.

When the front desk called on Saturday, no one answered the phone. The desk manager figured they had gotten an early start and were already on the slopes. Sunday was the same. It wasn’t until a maid went to check on the room that the couple were found to be still in bed, unresponsive.

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Minimal 433 MHz Web Home Automation

How minimal can a decent home automation setup be? If you need an HTML frontend, you’re going to need a webserver. An ESP8266 will do the trick. And then you need to be able to control your electronics. The cheapest and easiest way to do that is with the ubiquitous 433 MHz remote-controlled outlets and a $1 radio unit from an online auction site. Add in a cheap ESP8266 module, and your total outlay is going to be under $20.

That’s exactly what [Nikos Kantarakias] did. He combined a bunch of available ESP8266 Arduino libraries — one for driving the 433 MHz radio modules, [Paul Stoffregen]’s libraries for keeping time and for setting alarms, and another for keeping track of time zones — with some of his own code for setting up WiFi access, and it’s done.

It’s all available on GitHub for your perusal. The code does some strange things — like requiring a complete reboot every time you set an alarm — but it does let you set recurring and one-off activations of the attached devices with a web interface that’s served off the ESP8266 itself. If you want your coffee machine to turn itself on in the mornings, and want a system that’s easy for the other inhabitants of your house to configure, something like this might be just the ticket.

But if you’re looking for a project on the other end of the ESP-tech spectrum, [CNLohr] wrote a standalone Ethernet controller for the thing. Woah.

Smart Mirror Reflects Hacker

Did [TobiasWeis] build a mirror that’s better at reflecting his image? No, he did not. Did he build a mirror that’s better at reflecting himself? We think so. In addition to these philosophical enhancements, the build itself is really nice.

The display is a Samsung LCD panel with its inconvenient plastic husk torn away and replaced with a new frame made of wood. We like the use of quickly made 3D printed brackets to hold the wood at a perfect 90 degrees while drilling the holes for the butt joints. Some time with glue, band clamps, and a few layers of paint and the frame was ready. He tried the DIY route for the two-way mirror, but decided to just order a glass one after some difficulty with bubbles and scratches.

A smart mirror needs an interface, but unless you own stock in Windex (glass cleaner), it is nice to have a way to keep it from turning into an OCD sufferer’s worst nightmare. This is, oddly, the first justification for the Leap Motion controller we can really buy into. Now, using the mirror does not involve touching the screen. [Tobias] initially thought to use a Raspberry Pi, but instead opted for a mini-computer that had been banging around a closet for a year or two. It had way more go power, and wouldn’t require him to hack drivers for the Leap Motion on the ARM version of Linux.

After that is was coding and installing modules. He goes into a bit of detail about it as well as his future plans. Our favorite is programming the mirror to show a scary face if you say “bloody mary” three times in a row.