Tindie

As evidenced by Tindie’s robust Sound section, audio hacking is alive and well. Though this can take many different forms, a very versatile tool for transporting electronic music signals is the MIDI, or Musical Instrument Digital Interface standard. Though originally meant to allow digital instruments and computers to interact with one another, these signals can be translated into physical outputs, such as the Robotic Drum Kit seen below:

Physically, the setup of these drums is simple enough. Actuators, most likely solenoids, cause devices to play the percussion instruments, but how does the signal get from computer signals to the solenoids themselves? You could hack something together to do this, but if you’d rather concentrate on the music, another alternative is this Relay Switcher device.

This “8 Channel MIDI-to-relay module” takes in a MIDI signal, then uses it to switch eight isolated SPDT relays that can drive up to 10 amps of current capacity per channel. Given the massive amount of power it’s capable of switching, it can open up all kinds of musical possibilities!

On the other hand, relays can’t effectively regulate sound intensity through pulse-width modulation. To gain this type of control you need a different option. Hardware designer  “Hotchk155,” offers a transistor-based switcher that has this capability.

If you’re considering between these to methods of switching for your next audio adventure, you can see the pros and cons of each device on this comparison sheet.

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Many of us tap our fingers or a writing implement when bored (or, more recently, spin bearings around). Although this type of musical creation method is likely as old as mankind itself, here’s a device to take your tapping skills to the next level, a beat looper that repeats your tapped rhythm.

As described in its product listing, you tap a pattern into its tiny speaker up to 12 beats long, and once you’ve repeated this pattern three times it will continue beeping in the same sequence. The device also shows the tempo in beats per minute, which can be adjusted via two buttons.

It’s an interesting device, but how do they handle the record and playback? It’s open source so you can not only play with it, but learn from the source code and do some modification for your own projects. An interesting idea be adding an aux cable jack for use in a performance, or you could even hook up the output using a transistor setup in order to actuate a physical device (or devices), as seen in this Kickstarter from daddamachines! You could even use something like this as a Morse code repeater, though you’d need some way to signify long and short taps.

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When you think of slow and semi-permanent display methods, E-Ink may come to mind, as once the proper bits are turned on or off they require no power to operate. On the other hand, a “no-power” display technology has actually been around since the 1960s in the form of flip-disk, or flip-dot, displays. They use an array of disks, each containing an electromagnet setup that literally flips the dots between a visible or a dark position.

Though they are gradually being replaced by newer technologies, this type of tech could be seen on public information displays, such as busses or airports for many years. Naturally, whenever a technology starts to phase out, enterprising hackers swoop in and re-purpose it for our own means. For better or worse, much of the time this turns into some sort of clock, like “Dottie,” seen on Hackaday.

As interesting as that is, it still looks like quite a bit of work. If you’d like a head start on your clicky clock, Shmonogear is selling a Bluetooth-enabled flip-clock prototype. It shows the hours, then a colon, then the minutes, pausing in between for a set time. Interface requires you to send it commands via the Nordic Bluetooth toolbox app, meaning you’ll need some technical expertise to work with it.

Naturally, this clock isn’t recommended for quiet areas due to its intermittent clicking, but would be great for somewhere that needs a little ambient noise!

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While the excellent Raspberry Pi and Arduino boards have gotten most of the attention in the last few years, another competitor, the ESP8266 module-based boards has been proving itself to be extremely useful Available at under $5, the module packs built-in WiFi as well as an 8o MHz processor into its tiny form factor. The video below shows how to get started with this excellent module using the Arduino IDE via a WeMos D1 Mini dev board.

As fascinating as that might be, most tutorials focus on simple IoT actions, like turning on a light or fan. On the other end of the spectrum, as seen here, they are powerful enough to be placed inside of a musical instrument to help visualize the notes that are being played.

Those are, of course, two extremes. What about something in the middle programming wise, such as an R/C car? It’s all a matter of what hardware you add to it. The kit pictured above includes a car chassis, as well as an ESP8266 development board. Since each of the car’s wheels is powered independently, its off-road traction should be excellent, and this would allow you to program some interesting turning algorithms.

For another vehicular ESP8266 use, be sure to check out my thoughts on a quadcopter flight controller based on this tech.

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Every day you wake up, eat breakfast, and go about your day, not considering the multitude of signals that are passing through your body at every instant. Perhaps that’s healthy though, as if you were aware of all of these signals, it would likely be impossible think of anything else—wearing a tin foil hat, if that expression is to be taken literally, wouldn’t seem like such a bad idea!

So what is to be done about this phenomenon? Fortunately, except in extreme circumstances it’s mostly harmless. If, however, you’d like to have a little fun with the radiation coming off of your phone, this bug-like LED device uses a series of diodes to light up when your phone rings, simply by absorbing energy emitted by it.

Note that this device works with only GSM phones, such as those used on AT&T in the US, as well as carriers in most of the rest of the world (not CDMA phones or, as you might suspect, land lines). On a related note, if you’d like to learn more about the differences in these two wireless technologies, here’s an article by PC Mag to fill you in on the details.

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Years ago, if you wanted to remote control a model vehicle or robot, easily accessible options were limited to using an R/C transmitter or infrared control. Things have progressed significantly though, and number of add-on module options which make it easy to implement control via WiFi or Bluetooth.

But the new trend is to do away with separate boards for microcontroller and wireless solution in favor of single-board solutions. For this purpose, Electronut Labs has released “Bluey,” based around the Nordic nRF52832 BLE SoC (system on a chip). In addition to Bluetooth and an ARM controller, Bluey comes with several sensors, as well as push buttons, a coin cell holder, and a breakout header for connecting to off-board components.

Ultrasonic robot made using the Bluey

Using its built-in sensors, this device can be used to give the operator remote feedback, or even for remote signalling via its RGB LED, but it’s capable of much more. As you can see here’s its the brains of a small rover, connecting to motors for t he wheels and an ultrasonic rangefinder on the nose.

You can find more examples of how Bluey has been used, and a few ideas that the creator has come up with for it on the project’s GitHub page. Wireless isn’t limited to Bluetooth, there is also a built-in NFC antenna and the 2.4 GHz radio can be used for some proprietary protocols as well. Additionally, if you’d like to learn how it can be programmed wirelessly, or OTA—over the air—info on this procedure can be found here.

Finally, for more info on Bluey’s development, be sure to check out the project’s Hackaday.io page.

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“LEGOs,” or more properly, “LEGO bricks” have inspired kids to build cars, castles, and many other fantastic creations since the later half of the 20th century. In fact, you’d be hard pressed to find a modern engineer or maker that didn’t play with these as a kid, since they work so well as a toy that’s relatively safe, yet one that lets you create something new and unusual.

Though there are still castles and cars to be made, LEGO has fully moved into the 21st century. In fact, using their EV3 processing unit, you can make your pretend LEGO robots actual robots! For example here’s an EV3 powered device playing a keyboard:

As neat as that is, LEGO did something even more amazing with this tech, and released it under an open source license. With this available, hackers Tully and Andy with Maker Studio took this EV3 architecture, and adapted it to an even more powerful platform, the BeagleBone Black. They named this new creation the “EVB.”

Interface-wise, you can plug all the normal LEGO sensors into the EVB, and since it’s based on the BeagleBone, the system is extremely versatile. Though the EV3 is no slouch, running at an impressive 300 MHz, the EVB is even more powerful, with a 1GHz processor and 512MB of RAM. You can see it displaying its prowess to solve a Rubik’s cube 3:00 in the video below:

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The late 1800s was an interesting time for science and invention. Human control of electricity was in its infancy, and many devices we use today, such as the light bulb, and even radio communication have their roots in this era.

By Hawkins, N. via Wikimedia Commons Public Domain

Of course, there were many other inventions that are perhaps less useful in themselves, but led us to a better understanding of certain concepts. The Tesla coil comes to mind, but you might also consider another lesser-known “spark device” known as the Wimshurst machine.

These machines build up charges via electrostatic induction via two disks that rotate in opposite directions. When the charge differential is built up enough, a spark occurs between two conductors. If you’d like to try out this interesting device, the SparKIT version is a modern take on it. This machine uses modern capacitors instead of Leyden jars to store the charge, and the counter-rotating disks are constructed out of PCB segments. Though capable of generating 20,000 volts of electricity, due to its low current capacity it’s safe to use under normal conditions, though electronics should stay away!

I certainly think this outdoes any “executive desk toys” that have come before it. Sure, your boss might have a kinetic sculpture that swings back and forth in perpetuity, thanks to a hidden electromagnet. You, however, will have 20 kV in your cubicle—which everyone will know as your Dr. Evil laugh reaches its peak.

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IoT devices are available for a seemingly endless number of task, many of them controlled by a smartphone. On the one hand, you likely carry this device with you nearly continuously, but after you log into your phone, open the required app, do whatever action is needed, and put it away, you may be better off just using a switch!

Of course there is an alternative; just wire a single button up to the Internet to do your bidding. Amazon has been taking advantage of this for quite some time with their Dash buttons. Though originally meant to help you order consumable items, they were immediately opened and creatively repurposed. Hackaday did an early blurb about them, or check out this article article written in 2017, featuring 26 hacks for these little gadgets!

[vimeo 159417287 w=640 h=360]

Another interesting alternative is the 1btn, seen in the above video. It’s purpose-built for general IoT use, and for standard actions, such as sending a text message or posting to Twitter, it should be quite easy to set up. Given its open source design, it could also be adapted to all kinds of more complicated IoT tasks.

Importantly, this device doesn’t maintain a connection to the Internet. It wakes up when pushed, does its duty, gives you LED light feedback, and goes back to sleep. This allows the battery to last somewhere around 300 presses, and takes 5-7 seconds to complete its sleep-action-sleep cycle.

You won’t be using it as a button-mashing game controller, but it’s a great device for less time-critical actions. Trying to remember when you changed the water filter in the kitchen? Want a reminder ten days after you cleaned the bathroom to do it again? This is a key to automating infrequency.

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Albertas Mickėnas, AKA “Catnip Electronics,” has been on Tindie since nearly the beginning, opening for business in December 2012. Since then he’s had over 1850 orders, and has sold nearly 5000 (yes, five thousand) of his I2C soil moisture sensors. As such, I was glad to get in contact with him for this blog.

Mickėnas got started with Tindie after seeing a post advertising this new site as a sort of “Etsy for electronics.” He decided to put his foot in the door, and got an order, followed by many, many more.

The new RS485 soil moisture sensor

He started out as a programmer, but he was hired at a local stage theater where they used a huge red display to show subtitles. They needed someone to change the display to show the Georgian (not the U.S. one) alphabet. As western fonts were hard coded into the device, this involved getting into the hardware, where he found an ATmega128 microcontroller inside. From there he says it was a matter of “tutorials, forums, Stack Exchange and loads of unfinished projects from this point to today.”

Albertas mentions that he doesn’t really have a theme to his store: “I just do my projects and sometimes I put them for sale if I feel there will be any demand for them.” Obviously he’s been right more than once, and has just come out with a Modbus RS485 version of his popular soil sensor. This device will allow for longer cables to each of these sensors, making them useful in professional environments without kludging something together (as some have done). Of course there are other interesting projects on the Catnip Electronics store, so be sure to check that out.

Mickėnas is quick to note that the best thing about selling on Tindie is that, “[The] audience is technically capable, intelligent and eager to learn. I like answering my support requests!” Like many sellers, he’s also a customer, so if you have a shipment bound for Lithuania, perhaps he’ll be using your product as well!

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