Bluetooth beacons have only been around for a few years, but the draw is incredible. With Bluetooth beacons, your phone is location aware, even with location services are turned off. They’re seen in fast food joints, big box retailers, and anywhere else there’s a dollar to be made. [Nemik] has been working on a home automation project, and came up with a use for Bluetooth beacons that might actually be useful. It’s a WiFi-based Bluetooth beacon notifier that scans the area for beacons and forwards them to an MQTT server.
[Nemik]’s ‘Presence Detector’ for Bluetooth advertisements is actually a surprisingly simple build, leveraging the unbelievably cheap wireless modules available to us today. The WiFi side of the equation is a NodeMCU v2 ESP8266 dev board that provides all the smarts for the device via Lua scripting. The Bluetooth side of the board is a PTR5518 module that has a nRF51822 tucked inside. With the right configuration, this small board will listen for BLE advertisements and forward them to an MQTT server where they can be seen by anyone on the network.
[Nemik] is selling these beacon to WiFi bridges, but in the spirit of Open Hardware, he’s also giving away the designs and firmware so you can make your own. If you ever have an abundance of Bluetooth beacons sitting around and want to make a beacons of Things thing, this is the build for it.
Many Ham Radio operators in the United States participate in Field Day. This is an annual exercise where radio operators are encouraged to set up stations in conditions that might occur after a natural disaster. Usually, this means taking over some park or camp site, bringing generators, portable equipment, and making it all work for the weekend before you tear it back down.
It isn’t much of a Field Day without electricity. That’s why most stations use a generator, solar cells, or even batteries. Today, though, you probably need an Internet-connected computer to do logging and other features. [HamRadioConcepts] has a video (see below) that shows how they grabbed Internet from a distance for their Field Day site.
The ever popular ESP8266 is popping up in more and more projects. There are CNC controllers, blinkey WiFi lighting, and downright bizarre WiFi to Ethernet bridges. [Cicero] has thrown his hat into the ring with one of these Ethernet-enabled ESP8266 builds, and right now everything works, it’s simple to put together, and cheap to build.
Astute readers will notice we’ve seen something like this before. A few months ago, [cnlohr] discovered the Ethernet controller in the ESP8266. This was, by every account, the hard way of doing things. [cnlohr] was driving the Ethernet directly through the ESP’s I2S bus. [Cicero]’s project does not. It uses the cheap ENC28J60 SPI to Ethernet adapter to put the ESP on a wired network. Is one solution better than the other? That’s arguable. Is one solution much simpler than the other? Yes, [Cicero]’s work allows anyone to add Ethernet to the ESP8266 with a few resistors and a module that costs $3 from the usual online shops.
Although this build is not as technically amazeballs as [cnlohr]’s work with driving Ethernet directly from the ESP, it is very easy to implement, opening up the doors to a few of the more interesting capabilities of a wired ESP. With the Ethernet unlocked, there’s a free WiFi interface to wardrive, snoop around in promiscuous mode, inject packets, bridge a bunch of ESPs in mesh mode to another network, and other network shenanigans. The ENC28J60 modules have probably already found their way into a few parts bins and junk boxes already, making [Cicero]’s work the quick start guide to wired networking on the ESP.
[jamesone111] bought a Transcend WifiSD card, presumably for photography, but it may just have been because he heard that they’re actually tiny Linux servers.
He read a post about these cards on the OpenWRT forums. They’re all a similar configuration of a relatively large amount of memory (compared to the usual embedded computer), a WiFi chip, and an ARM processor running a tiny Linux install. The card acts as a WiFi access point with a little server running on it, and waits for the user to connect to it via a website. It also has a mode where it will connect to up to three access points specified by the user, but it doesn’t actually have a way to tell the user what its IP address is; which is kind of funny.
[jamesone111] hacked around with the Transcend card for a bit. He found it pretty insecure, which as long as you’re not a naked celebrity, shouldn’t be a huge issue. For the hacker this is great as it opens up the chance of hacking the firmware for other uses.
Some have already pulled off some cool hacks with these cards. For example, [peterburk] hacked a similar card by PQI to turn his iPod into a portable file server.
If necessity is the mother of invention, then inconvenience is its frustrating co-conspirator. Faced with a finicky dryer that would shut down mid-cycle with a barely audible beep if its load was uneven (leaving a soggy mass of laundry), [the0ry] decided to add the dryer to the Internet of Things so it could send them an email whenever it shut itself down.
After opening a thinger.io account, adding the soon-to-be device, and setting up the email notification process, [the0ry] combined the ESP8266 Development Board, a photosensitive resistor, and a 5V power supply on a mini breadboard. All that was left was to mount it on the dryer and direct the LDR (light-dependent resistor) to the machine’s door lock LED to trigger an email when it turned off — indicating the cycle had finished or terminated prematurely. A little tape ensured the LDR would only be tripped by the desired light source.
If you’re an apartment-dweller have WiFi in the wash area it would be awesome to see a battery-powered version you take with you. But in general this is a great hardware blueprint as many device have status LEDs that can be monitored in a similar way. If you want to keep the server in-house (literally in this case) check out the Minimal MQTT series [Elliot Williams] recently finished up. It uses a Raspberry Pi as the center server and an ESP8266 is one of the limitless examples of hardware that plays nicely with the protocol.
We love seeing hacks like this because not only does it conserve water and energy by reducing instances of rewashing, but it’s also a clever way to extend the life of an appliance and potentially save hundreds of dollars in replacing it. Add this to the bevvy of hacks that add convenience to one’s home — some of which produce delicious results.
It’s no secret that we love the ESP8266 chip, and the community of hackers that have contributed to making it useful. We often joke about this or that new WiFi-enabler being an ESP8266 killer, but so far none have stepped up. Here we go again!
Espressif has released a chip that’s going to be an ESP8266 killer, and no, it’s not the ESP32. The ESP8285 went into mass production in March, and should start to appear in the usual outlets fairly soon.
What makes it an ESP8266 killer? It’s an ESP8266, but with the flash memory onboard. Nothing more, but also nothing less. What does this mean? Tiny, tiny designs are possible. And, if the street price ends up being right, there’s no reason you wouldn’t opt for built-in flash. (Unless you were planning on doing some ROM hacking.)
[David] created a great looking e-ink WiFi display project that works a little like a network-connected picture frame with a few improvements over other similar projects. With the help of an ESP8266 it boots up, grabs an 800×600 image over the network, updates the screen, then goes back to sleep. Thanks to some reverse engineering, he was able to make his own firmware for the onboard controller to handle the low-level driving of the display. Since e-ink displays require no power to hold an image and the rest of the unit spends most of the time either asleep or off, power use is extremely low. [David] hopes to go months without needing to recharge the internal lithium-polymer battery.
We previously featured another WiFi-connected e-ink display project that was in fact also the inspiration for this version. [David] uses a 4.3″ 800×600 GDE043A e-ink display and wrote his own firmware for the STM32F103ZE ARM CortexM3 SoC used as a display controller, a process that required some reverse engineering but was aided by the manufacturer providing a closed-source driver for him to use. [David] writes that some reverse-engineering work for this display had already been done, but he had such a hard time getting a clear understanding from it that he reverse engineered the firmware anyway and used the documents mainly for validation and guidance.
As a result, [David] was able to make use of the low-level driver electronics already present on the board instead of having to make and interface his own. E-ink displays have some unusual driving requirements which include generating relatively high positive and negative voltages, and rapidly switching them when updating the display. Taking advantage of the board’s existing low-level driver electronics was a big benefit.
The ESP8266 rounds out the project by taking care of periodically booting things up, connecting to the wireless network and downloading an image, feeding the image data to the STM32 to update the display, then disconnecting power from all non-essential electronics and going back to sleep. We especially like how the unit automatically creates a WiFi access point to allow easy (re)configuring.
There’s one more nice touch. [David] goes the extra mile with server software (in the form of PHP scripts) to design screens for the display with data like weather forecasts, stock prices, and exchange rates. Check it out in the project’s github repository.