Joe Activation With A WiFi-Controlled Electrical Outlet

September 9, 2017 by John Baichtal 13 Comments

[Mike] is the only one in his house who drinks coffee, and uses a simple single-serving brewer with no auto-on feature. And since no one really wants to have to stand around making coffee in the morning, [Mike]’s solution was to IoT-ize his electrical socket.

MQTT Dash is an Android app “for nerds only ;)”

The project consists of a relay board controlled by an ESP8266-packing Adafruit Huzzah. It’s all powered by a 9V power supply with a regulator supplying the relay coil and Huzzah with 5V. [Mike]’s using CloudMQTT to communicate with the outlet.

We often see these automation projects hit a wall when it comes to adding a user-side dashboard. [Mike] is using a free Android app called MQTT Dash which allows for a number of different UI components and even had coffee maker icons already built in. It’s certainly worth a look for your own projects. [Mike] uses it to turn on the outlet for 10 minutes, and by the time he grabs half-and-half the outlet is already off again.

It turns out that connecting coffee pots to the Internet is a driving force among out readers. This one alerts the whole office when the coffee is done, while another one is controlled by Alexa. Then again, sometimes all you can do is reverse engineer the Internet of coffee.

Control The Air Conditioning With Slack

August 23, 2017 by Rich Hawkes 7 Comments

[Raphael Baron] needed a better way to control his office’s air conditioning units. Sure, they have remotes, but that’s too easy. [Raphael] came up with a solution that uses an ESP8266, a computer, IR LEDs, and a bot that runs on Slack.

[Raphael] built a prototype of the ESP8266 hardware on protoboard and used it to read and record the IR signals from the remote. Once he’d figured out the issues he was having with the IR library he was using, he could use it to send the IR commands to the AC unit. Since their office has two AC units, [Raphael] built a second prototype which had two IR LEDs but didn’t have the IR receiver. Using this he could turn both AC units on and off and set their temperatures.

For the server, [Raphael] turned to Clojure, a dialect of Lisp, which provides easy access to the Java Framework, mainly to get practice working with the language. The server’s main responsibility is to use Slack’s real-time API to listen for messages from a Slack bot and forward them to the ESP. In this way, a user talking to the Slack bot can send it messages which the server forwards to the microcontroller which, in turn, parses the messages and send IR commands to the AC units.

[Raphael] admits that this isn’t the most advanced, professional stuff, but it doesn’t matter. The schematics for the ESP8266 board and the code for both the ESP board and the server are available on GitHub. There seems to be a lot of hacks using Slack, such as this NERF Turret controlled by a Slack bot. Or this jukebox that users can interact with by talking to a Slack bot.

6502 Retrocomputing Goes To The Cloud

July 8, 2017 by Al Williams 40 Comments

In what may be the strangest retrocomputing project we’ve seen lately, you can now access a virtual 6502 via Amazon’s Lambda computing service. We don’t mean there’s a web page with a simulated CPU on it. That’s old hat. This is a web service that takes a block of memory, executes 6502 code that it finds in it, and then returns a block of memory after a BRK opcode or a time out.

You format your request as a JSON-formatted POST request, so anything that can do an HTTP post can probably access it. If you aren’t feeling like writing your own client, the main page has a form you can fill out with some sample values. Just be aware that the memory going in and out is base 64 encoded, so you aren’t going to see instantly gratifying results.

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Blinking A Light With Ping

July 6, 2017 by Brian Benchoff 24 Comments

The Flashing Light Prize is on right now, and that means all our favorite geeks and YouTubers are aspiring to what could be done with a 555. The rules are simple: turn a light bulb on and off somehow. [Sprite_tm] is answering the call, and he’s blinking lightbulbs at the speed of light.

[Sprite]’s method of blinking a light is simple: Use an ESP32 development board to turn on a relay. At the same time, send a packet out to the Internet and through four servers spread across the globe. When the packet goes through servers in Shanghai, the Netherlands, to Hong Kong, to Germany, and finally Japan — and back again — the light bulb turns off. It’s a physical demonstration of the speed of light and the quality of undersea optical fibers.

This route is quite long, and a reasonable estimate for the one-way, great circle path from Shanghai to the Netherlands to Hong Kong to Berlin and finally to somewhere near Osaka is about 36,000 km. A round trip for this light bulb packet is 72,000 km, or about 0.2 light-seconds. There are delays, of course, from fiber and cables not going directly over the Himalayas, delays in routers, and the difference between the speed of light in a vacuum and the speed of light in glass fiber. Still, light is quick, and the light blinks at about 1Hz.

You can check out [Sprite]’s entry video for the Flashing Light Prize below.

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Controlling A Robot Over The Internet Grows Up

June 17, 2017 by John Baichtal 3 Comments

Since the beginning of the Internet people have been controlling robots over it, peering at grainy gifs of faraway rec rooms as the robot trundles around. RunMyRobot.com has taken that idea and brought it fully into the teens. These robots use wifi or mobile connections, are 3D printed, and run Python.

The site aims to provide everything to anyone who wants to participate. If you’re just an anonymous visitor, you can still play with the robots, but anyone can also play with the same one, and sometimes a whole bunch of visitors create a cacophony of commands that makes it not fun—but you can always move to a different robot. Logged-in members of the site have the option to take over a robot and not allow anyone else to use it.

If you want to build a robot and add it to the site, the creators show how to do that as well, with a Github code repository and 3D-printable designs available for download, as well as YouTube instructions on how to build either the printed robot or one made with off-the shelf parts. They’re also looking for patrons to help with development, with the first item on their list being a mobile app.

Thanks to [Sim] for the link.

Alexa, Sudo Read My Resistor! A Challenge For Hackers

May 19, 2017 by Al Williams 39 Comments

Nothing makes us feel more like we’re on Star Trek then saying “Computer, turn on desk light,” and watching the light turn on. Of course, normal people would have left the wake up word as “Alexa,” but we like “Computer” even if it does make it hard to watch Star Trek episodes without the home automation going crazy.

There’s a lot of hype right now about how voice recognition and artificial intelligence (AI) are transforming everything. We’ve even seen a few high-profile types warning that AI is going to come alive and put us in the matrix or something. That gets a lot of press, but we’re not sure we are even close to that, yet. Alexa and Google’s similar offerings are cool, there’s no doubt about it. The speech recognition is pretty good, although far from perfect. But the AI is really far off still.

Today’s devices utilize two rather rudimentary parts to provide an interaction with users. The first is how the devices pattern match language; it isn’t all that sophisticated. The other is the trivial nature of many of the apps, or — as Alexa calls them — skills. There are some good ones to be sure, but for every one useful application of the technology, there’s a dozen that are just text-to-speech of an RSS feed. Looking through the skills available we were amused at how many different offerings convert resistor color codes back and forth to values.

There was a time when building electronics meant learning the resistor color code. With today’s emphasis on surface mount components, though, it is less useful than it used to be. Still, like flossing, you really ought to do it. However, if you have an Amazon Alexa, it can learn the color code for you thanks to [Dennis Mantz].

Don’t have an Alexa? You can still try it in your browser, as we will show you shortly. There are at least eight similar skills out there like this one from [Steve Jernigan] or [Andrew Bergstrom’s] Resistor Reader.

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Attack On The Clones: A Review Of Two Common ESP8266 Mini D1 Boards

May 15, 2017 by Sean Boyce 34 Comments

ESP8266-based development boards have proliferated rapidly. One favorite, the WEMOS Mini-D1 is frequently imitated and sold without any branding. As these boards continue to ship to hobbyists and retailers around the world, we thought it might be interesting to conduct a little experiment.

There are a few ESP8266 development boards available, and the most popular seem to be the NodeMCU ‘Amica’ board. Of course, there are dozens of other alternatives including the WiFiMCU, Sparkfun’s ESP8266 Thing, and Adafruit’s HUZZAH ESP8266. Given that, why is this review limited to the Mini D1 boards? Because the Mini D1 is the cheapest. Or was, until it was cloned.

We took a look at some of these ‘clone’ boards to figure out the differences, find out if they work as intended, and perhaps most importantly, are these clone boards shipped out reliably. What are the results? Check that out below.

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