Logs For A Toilet

The Internet of Things, as originally envisioned in papers dating to the early to mid-90s, is a magical concept. Wearable devices would report your location, health stats, and physiological information to a private server. Cameras in your shower would tell your doctor if that mole is getting bigger. Your car would monitor the life of your cabin air filter and buy a new one when the time arrived. Nanobots would become programmable matter, morphing into chairs, houses, and kitchen utensils. A ubiquity of computing would serve humans as an unseen hive mind. It was paradise, delivered by ever smaller computers, sensors, and advanced robotics.

The future didn’t turn out like we planned. While the scientists and engineers responsible for asking how they could make an Internet-connected toaster oven, no one was around to ask why anyone would want that. At least we got a 3Com Audrey out of this deal.

Fast forward to today and we learn [Christopher Hiller] just put his toilet on the Internet. Why is he doing this? Even he doesn’t know, but it does make for a great ‘logs from a toilet’ pun.

The hardware for this device is a Digistump Oak, a neat little Arduino-compatible WiFi-enabled development board. The Digistump Oak is able to publish to the Particle Cloud, and with just five lines of code, [Chris] is able to publish a flush to the Internet. The sensor for this build is a cheap plastic float switch. There are only three components in this build, and one of them is a 4k7 resistor.

Right now, there are a few issues with the build. It’s battery-powered, but that’s only because [Chris]’ toilet isn’t close enough to a wall outlet. There’s a bit of moisture in a bathroom, and clingfilm solves the problem for now, but some silly cone carne would solve that problem the right way. [Chris] also has two toilets, so he’ll need to build another one.

The Digistump Oak; An ESP8266 On Kickstarter

When it was first released, the ESP8266 was a marvel; a complete WiFi solution for any project that cost about $5. A few weeks later, and people were hard at work putting code on the tiny little microcontroller in the ESP8266 and it was clear that this module would be the future of WiFi-enabled Things for the Internet.

Now it’s a Kickstarter Project. It’s called the Digistump Oak, and it’s exactly what anyone following the ESP8266 development scene would expect: WiFi, a few GPIOs, and cheap – just $13 for a shipped, fully functional dev board.

The guy behind the Oak, [Erik Kettenburg], has seen a lot of success with his crowdfunded dev boards. He created the Digispark, a tiny, USB-enabled development board that’s hardly larger than a USB plug itself. The Digispark Pro followed, getting even more extremely small AVR dev boards out in the wild.

The Digistump Oak moves away from the AVR platform and puts everything on an ESP8266. Actually, this isn’t exactly the ESP8266 you can buy from hundreds of unnamed Chinese retailers; while it still uses the ESP8266 chip, there’s a larger SPI Flash, and the Oak is FCC certified.

Yes, if you’re thinking about building a product with the ESP8266, you’ll want to watch [Erik]’s campaign closely. He’s doing the legwork to repackage the ESP into something the FCC can certify. Until someone else does it, it’s a license to print money.

The FCC-certified ESP8266 derived module, cleverly called the Acorn, will be available in large quantities, packaged in JEDEC trays sometime after the campaign is finished. It’s an interesting board, and we’re sure more than one teardown of the Acorn will hit YouTube when these things start shipping.

Body of a Trinket, Soul of a Digispark


Adafruit’s Trinket and digiStump’s Digispark board are rather close cousins. Both use an ATtiny85 microcontroller, both have USB functionality, and both play nice with the Arduino IDE. [Ray] is a fan of both boards, but he likes the Trinket hardware a bit better. He also prefers the Digispark libraries and ecosystem. As such, he did the only logical thing: he turned his Trinket into a Digispark. Step 1 was to get rid of that pesky reset button. Trinket uses Pin 1/PB5 for reset, while Digispark retains it as an I/O pin. [Ray] removed and gutted the reset button, but elected to leave its metal shell on the board.

The next step was where things can get a bit dicey: flashing the Trinket with the Digispark firmware and fuses. [Ray] is quick to note that once flashed to Digispark firmware, the Trinket can’t restore itself back to stock. A high voltage programmer (aka device programmer) will be needed. The flashing process itself is quite a bit easier than a standard Trinket firmware flash. [Ray] uses the firmware upload tool from the Micronucleus project. Micronucleus has a 60 second polling period, which any Trinket veteran will tell you is a wonderful thing. No more pressing the button and hoping you start the download before everything times out! Once the Trinket is running Digispark firmware, it’s now open to a whole new set of libraries and software.