Broadcasting Bluetooth Beacons With Bubbles

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.

Compiling Your Own Programs For The ESP8266

When the ESP8266 was first announced to the world, we were shocked that someone was able to make a cheap, accessible UART to WiFi bridge. Until we get some spectrum opened up and better hardware, this is the part you need to build an Internet of Things thing.

It didn’t stop there, though. Some extremely clever people figured out the ESP8266 had a reasonably high-power microcontroller on board, a lot of Flash, and a good amount of RAM. It looked like you could just use the ESP8266 as a controller unto itself; with this chip, all you need to do is write some code for the ESP, and you have a complete solution for your Internet connected blinking lights or WiFi enabled toaster. Whatever the hip things the cool kids are doing these days, I guess.

But how do you set up your toolchain for the ESP8266? How do you build projects? How do you even upload the thing? Yes, it’s complicated, but never fear; [CNLohr] is here to make things easy for you. He’s put together a video that goes through all the steps to getting the toolchain running, setting up the build environment, and putting some code on the ESP8266. It’s all in a git, with some video annotations.

The tutorial covers setting up the Xtensa toolchain and a patched version of GCC, GDB, and binutils. This will take a long, long time to build, but once it’s done you have a build environment for the ESP8266.

With the build environment put together, [CNLohr] then grabs the Espressif SDK from the official site, and puts together the example image. Uploading to the module requires pulling some of the pins high and some low, plugging in a USB to serial module to send the code to the module, standing well back, and pressing upload.

For his example image, [CNLohr] has a few WS2812 RGB LEDs connected to the ESP8266 WiFi module. Uploading the image turns the LEDs into something controllable with UDP packets on port 7777. It’s exactly what you want in a programmable, WiFi chip, and just the beginning of what can be done with this very cool module.

If you’re looking around for some sort of dev board with an ESP8266 on it, [Mathieu] has been playing around with some cool boards, and we’ve been looking into making a Hackaday version to sell in the store. The Hackaday version probably won’t happen because FCC.

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GCC for the ESP8266 WiFi Module

When we first heard about it a few weeks ago, we knew the ESP8266 UART to WiFi module was a special beast. It was cheap, gave every microcontroller the ability to connect to a WiFi network, and could – possibly – be programmed itself, turning this little module into a complete Internet of Things solution. The only thing preventing the last feature from being realized was the lack of compiler support. This has now changed. The officially unofficial ESP8266 community forums now has a working GCC for the ESP8266.

The ESP8266 most people are getting from China features a Tensilica Xtensa LX3 32-bit SOC clocked at 80 MHz. There’s an SPI flash on the board, containing a few dozen kilobytes of data. Most of this, of course, is the code to run the TCP/IP stack and manage the radio. There are a few k left over – and a few pins – for anyone to add some code and some extended functionality to this module. With the work on GCC for this module, it’ll be just a few days until someone manages to get the most basic project running on this module. By next week, someone will have a video of this module connected to a battery, with a web-enabled blinking LED.

Of course that’s not the only thing this module can do; at less than $5, it will only be a matter of time until sensors are wired in, code written, and a truly affordable IoT sensor platform is created.

If you have a few of these modules sitting around and you’d like to give the new compiler a go, the git is right here.