Bike Lock Secures Car

[Buttim] loses his car a lot, which might sound a little bit like the plot from an early-00s movie, but he assures us that it’s a common enough thing. In a big city, and after several days of not driving one’s car, it can be possible to at least forget where you parked. There are a lot of ways of solving this problem, but the solution almost fell right into his lap: repurposing a lock from a bike share bicycle. (The build is in three parts: Part 2 and Part 3.)

These locks are loaded with features, like GPS, a cellular modem, accelerometers, and in this case, an ARM processor. It took a huge amount of work for [Buttim] to get anything to work on the device, but after using a vulnerability to dump the firmware and load his own code on the device, spending an enormous amount of time trying to figure out where all the circuit traces went through layers of insulation intended to harden the lock from humidity, and building his own Python-based programmer for it, he has basically free reign over the device.

To that end, once he figured out how it all worked, he put it to use in his car. The device functions as a GPS tracker and reports its location over the cellular network so it can’t become lost again. As a bonus, he was able to use the accelerometers to alert him if his car was moving without him knowing, so it turned into a theft deterrent as well. Besides that, though, his ability to get into the device’s firmware reminded us of a recent attempt to get access to an ARM platform.

The Key To This City Opens A Real Lock

There are few more satisfying moments than the first time you pick a lock. No matter that it’s a dollar-store padlock that you opened with a pick from a $10 eBay kit, the magic of something that should be secure clicking open in the palm of your hand is hard to beat. Pin tumbler locks are surprisingly simple devices, and to demonstrate this [Farmcraft 101] has produced one at 10x scale to demonstrate their operation on the bench.

The video is a delightful exercise in wood-shop voyerism, as we see him construct the various parts of the lock using his lathe and other workshop tools. A key of the size usually reserved for Freedom Of The City is made, but this one really does slide into the keyway and operate those pins. At the back is a latch mechanism, and the result is a fully-functional model that anyone should be able to use to figure out how the lock works.

Thelock itself isn’t the whole story though, because given the date he’s used it as the basis for a cracking April Fool in which he sends up the [Lock Picking Lawyer] and proceeds to demonstrate the glaring insecurities in his creation. Both videos are there for your enjoyment, below the break. And if you can’t wait to have a go at a lock or two, don’t forget you can always make your own tools using paperclips.

[Ed note: streetcleaner bristles. Thank me later.]

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Bolts, Brass, And Machining Chops Make Up This Tiny Combination Safe

Another day, another video that seriously makes us doubt whether eschewing the purchase of a lathe in favor of feeding the family is a value proposition. This time, [Maker B] shows us what the queen of machine tools can do by turning a couple of bolts into a miniature safe.

We’ll state right up front that this build doesn’t source all its material from a single bolt. It’s more like two bolts and a few odd pieces of brass, but that doesn’t detract from the final product one bit. [Maker B] relieves the two chunky stainless steel bolts of their hex heads and their threads on the lathe, forming two nesting cylinders with a satisfyingly tight fit. A brass bar is machined into a key that fits between slots cut in the nesting cylinders, while discs of brass form the combination dials. Each disc is stamped around its circumference with the 26 letters of the alphabet; we thought the jig used for stamping was exceptionally clever, and resulted in neat impressions. The combination, which is set by placing a pin next to a letter in each disc, protects the admittedly limited contents of the tiny safe, but functionality is hardly the point. This is all about craftsmanship and machining skills, and we love it.

If you’ve sensed an uptick in resource-constrained builds like this lately, you’re not alone. The “one bolt challenge” has resulted in this wonderfully machined combination lock, as well as the artistry of this one-bolt sculpture. We’re all in favor of keeping the trend going. Continue reading “Bolts, Brass, And Machining Chops Make Up This Tiny Combination Safe”

A Simple App Controlled Door Lock

[Adnan.R.Khan] had a sliding door latch plus an Arduino, and hacked together this cool but simple app controlled door lock.

Mechanically the lock consists of a Solarbotics GM3 motor, some Meccano, and a servo arm. A string is tied between two pulleys and looped around the slide of a barrel latch. When the motor moves back and forth it’s enough to slide the lock in and out. Electronically an Arduino and a Bluetooth module provide the electronics. The system runs from a 9V battery, and we’re interested to know whether there were any tricks pulled to make the battery last.

The system’s software is a simple program built in MIT App Inventor. Still, it’s pretty cool that you can get functionally close to a production product with parts that are very much lying around. It also makes us think of maybe keeping our childhood Meccano sets a little closer to the bench!

Use A Digital Key To Deter Lockpicking

Spending an hour or two around any consumer-level padlock or house deadbolt lock with a simple lockpicking kit will typically instill a good amount of panic and concern about security. While it’s true that any lock can be defeated, it’s almost comically easy to pick basic locks like this. So, if you’re looking for a level of security that can’t be defeated in two minutes with a tiny piece of metal, you might want to try something a little more advanced.

This project stemmed from an idea to use a YubiKey, a USB hardware token typically used for two-factor authentication, for physical locks instead. The prototype was built around an Arduino UNO, and all of the code and build instructions are available on the project’s site. The creator, [rprinz08], does not have one built inside of a secure enclosure so that would remain an exercise for the reader, but the proof-of-concept is interesting and certainly useful.

While digital keys like this can have their own set of problems (as all locks do), this would be a great solution for anyone needing to lock up anything where physical keys are a liability or a nuisance, where logging is important, or where many people need access to the same lock. The open source code and well-known platform make it easy for anyone to build, too.

Turning A Single Bolt Into A Combination Lock

In our search for big-box convenience, we tend to forget that locksmiths once not only copied keys but also created complex locks and other intricate mechanisms from scratch. [my mechanics] hasn’t forgotten, and building a lock is his way of celebrating of the locksmith’s skill. Building a combination lock from a single stainless bolt is probably also showing off just a little, and we’re completely fine with that.

Granted, the bolt is a rather large one – an M20x70 – and a few other materials such as brass rod and spring wire were needed to complete the lock. But being able to look at a single bolt and slice it up into most of the stock needed for the lock is simply amazing. The head became the two endplates, while the shank was split in half lengthwise and crosswise after the threads were turned off; those pieces were later turned down into the tubes and pins needed to create the lock mechanism. The combination wheels probably could have come from another – or longer – bolt, but we like the look of the brass against the polished stainless, as well as the etched numbers and subtle knurling. The whole thing is a locksmithing tour de force, and the video below captures all of it without any fluff or nonsense.

If working in steel and brass isn’t your thing, fear not – a 3D-printed combination lock is probably within your reach. Or laser cut wood. Or even plain paper, if you’re not into the whole security thing.

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WiFi Your Door Lock With An ESP

The Internet of Things is upon us, and with that comes a deluge of smart cameras, smart home monitors, and smart home locks. There actually aren’t many smarts in these smart conveniences, and you can easily build your own. That’s what [MakerMan] did with some off-the-shelf parts and just a little bit of code. Now he can open his door with WiFi, and it’s a nice clean build.

The build process began by first removing the existing barrel bolt on the door. This was replaced by a deadbolt that also had some really neat solenoids inside for remote activation. This was mounted to the door in a way that the door could lock, with a minimal amount of damage from some skillful hacksaw work. The only thing left to do after this was add some electronics and brains to the lock.

For this, [MakerMan] added a button and LED to the outside of the door. Some of these wires were fed into the lock mechanism, with a few more run over to a project enclosure mounted next to a power outlet. The project enclosure holds an ESP-8266, power regulator, and relay board, and the ESP is running code that instantiates a web server that will unlock the door with a few clicks on a web page.

Sure, it’s probably not the most secure lock on the planet, and the 5V linear regulator is held on to the relay board with hot glue, but this is an exceptionally well-documented project, and all the code is available in an archive.

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