By now we’ve seen plenty of projects that use an ESP8266 as a form of rudimentary access control: tap a button on your smartphone, and the door to your apartment unlocks. With the power and flexibility of the ESP, it’s a very easy project to pull off with minimal additional hardware. But what about if you want to get a little more serious, and need to support many users?
Rather than reinvent the wheel, you might want to check out the extremely impressive ESP-RFID project. It’s still based on the ESP8266 we all know and love, but it combines the diminutive WiFi-enabled microcontroller with a nice custom PCB and some exceptionally slick software to create a very professional access control system without breaking the bank. As the name implies, the system is geared towards RFID authentication and supports readers such as the MFRC522, PN532 RFID, or RDM6300. Add in a stack of Mifare Classic 1KB cards, and your hackerspace is well on the way to getting a new door control system.
The official hardware for ESP-RFID can be purchased through Tindie with or without an installed ESP-12F module, but as it’s a fully open source project, you’re also free to build your own version if you’d like. In either event, the board allows you to easily connect the ESP up to your RFID reader of choice, as well as door sensors and of course the door locks themselves.
On the software side of things, ESP-RFID should be able to handle about 1000 unique users and their RFID cards before the relatively limited RAM and storage of the ESP catches up with it. But if you’ve got that many people coming and going in your hackerspace, it might be time to update your systems to begin with. Incidentally, the project makes no guarantees about the security of the ESP-RFID code, and says that the system shouldn’t be used for secure locations. That said, you can run ESP-RFID without an Internet connection to reduce your attack surface, at the cost of losing NTP time synchronization.
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.
At this point we’re all well aware of the fact that there is some inherent danger involved when bringing “things” onto the Internet. Nobody wants to come home to a smoldering pile of ruble because their Internet connected toaster oven decided to get stuck on “Hades.” But even with the risks, occasionally we see projects that prove at least some intrepid hackers are managing to navigate the Internet of Things to solve real-world problems.
Thanks to the old-school intercom setup, the hardware for this project is simple in the extreme. All [Daniel] needed was a relay to close the circuit on the door buzzer, and a way to fire it off. For his controller he chose the Photon from Particle, which is perhaps a bit overkill, but we all tend to work with what we’re personally comfortable with.
Most of the work went into the software, as [Daniel] ended up coming with two distinct ways to control the door lock over the Internet. The first method uses Blynk, which allows you to create slick visual interfaces for mobile devices. His second version is controlled with a POST request to a specific URL, which he likes because it gives him more flexibility as to how he can interact with the lock. Currently he has a simple web page setup that lets friends and family open the door by just clicking a button.
Seeing as grinding pepper requires at least as much torque as turning an average key in an average lock, the electric pepper mill makes perfect sense to use as a lock actuator. This build actually uses the electric pepper mill to directly turn the key in the lock, courtesy of an adapter to couple the square output shaft to the key. The adapter was crafted out of a moldable plastic called MultiMorph. The pepper mill is being used for its high-torque motor & gearbox, which makes it absolutely perfect for this application.
The rest of the project leans heavily on the hacker’s go-to, an Arduino and some off-the-shelf gesture recognition modules. Now, it’s possible to lock and unlock the door at the press of a button or the wave of a hand! Video after the break.
Group entry hacks are a favorite for hacker social groups. Why use old fashioned keys when you can use newfangled electronic keys? If you are looking to build a simple RFID-based security system to secure your important stuff, this project from Resin.io is a good place to start. In it, [Joe Roberts] outlines the process of building a simple RFID-triggered mechanism for their office door.
It’s a pretty simple setup that is composed of an RFID reader, a Rasperry Pi and a Neopixel ring. When someone places an RFID card against the reader hidden behind a poster by their front door, the reader grabs the code and the Pi compares it with a list of authorized users. If the card is on the list, the Pi triggers the door lock using a signal line originally designed to work with an intercom system. If the user isn’t on the list, a laser is triggered that vaporizes the interloper… well, that’s perhaps in the next version, along with an API that will allow someone to open the door from the company chat application.
At the moment, this is a clean, simple build that uses only a few cheap components, but which could be the basis for a more sophisticated security system in the future.
If you’ve been to an apartment complex with a locked front door, you’ve seen the buzzer systems. You press the corresponding button for the apartment you want and can talk to the resident. They can press a button to unlock the door briefly, and then you go up to their apartment and they don’t have to come down to let you in. But what if you’re the resident and you want to go for a run without your keys jingling in your pocket? What if you want to open it using just your smartphone?
I knew this was a silly problem, and everyone I told about it thought that for the amount of time and effort it might save, it was hardly worth it.
How fast can I put this together using only parts I have around the apartment? Turns out about 2 hours.
[James] works from home. His office is filled with objects that can be described with adjectives such as, “expensive,” and, “breakable.” His home, however, is filled with professional object-breakers known as children. To keep these two worlds from colliding, he installed a keypad lock on his office door. The potential side-effect of accidentally training his children to be master safe-crackers aside, the system seems to work so far.
However, being a hacker, the tedium of entering a passcode soon grew too heavy for him. Refusing to be a techno-peasant, he set out to improve his lock. The first step was to reverse engineer the device. The lock is divided into two halves, one has a keypad and handle, the other actually operates the lock mechanism. They are connected with a few wires. He hooked an oscilloscope to the most likely looking candidates, and looked at the data. It was puzzling at first, until he realized one was a wake-up signal, and the other was the data. He then hooked the wires up to a Bluetooth-enabled Arduino, and pressed buttons until he had all the serial commands the door lock used.
After that it was a software game. He wrote code for his phone and the Arduino to try out different techniques and work out bugs. Once he had that sorted, he polished the app and code until he reached his goal. All of the code is available on his GitHub.
Finally, through his own hands, he elevated himself from techno-peasant to wizard. He need but wave his pocket oracle over the magic box in front of his wizard’s lair, and he will be permitted entry. His wizardly trinkets secure from the resident orcs, until they too begin their study of magic.