Toy Hacks

951 Articles

How The Hero Droid BB-8 Rolls

January 1, 2018 by 10 Comments

By now we’ve come to expect a bountiful harvest of licensed merchandise to follow every Star Wars film. This year’s crop included many flavors of BB-8 so every fan can find something to suit their taste. At the top of this food chain is a mobile interactive “Hero Droid BB-8”. For those who want to see how it works, [TheMikeSenna] cracked open his unit to feed our curiosity.

Also called “Spin Master BB-8” for the manufacturer, this toy is impressively sophisticated for its price point. The video surveyed the mechanical components inside the ball. Showing how the droid travels, and how the head articulates.

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Fingerling Disemboweled For Your Entertainment

December 28, 2017 by 21 Comments

Due to the graphic nature of this post, small children and the elderly may want to leave the room. One of the hottest toys this holiday season has been gutted like a fish so that we may better understand the nature of its existence. Or maybe just what kind of sensors and motors the craftsmen over at WowWee managed to cram into a “robot” with an MSRP of only $15 USD.

[Josh Levine] mercilessly tears a Fingerling Monkey limb from limb on his blog, and points out some interesting design decisions made. While some elements of the toy are rather clever, there’s a few head-scratchers to be had inside the Fingerling. It’s interesting to see the final results of a decision process that had to balance the relatively rough life such a toy will live with the ever crucial cost of production.

The eyelids are particularly well thought out, operated by charging a coil under a magnet which is embedded in the plastic. Opening and closing the eyelids without a separate motor or gearbox is not only easier and cheaper, but prevents the possibility of damage if a child attempts to force open the eyes or otherwise manipulate the mechanism.

Other cost saving measures include the use of foil tape as a capacitive sensor, and simple ball-filled tilt sensors to detect orientation rather than an expensive accelerometer.

Interestingly, other parts of the toy seem overengineered in comparison. A cam and limit switch are used to detect when the Fingerling’s head has turned to its maximum angle, when it would have been cheaper and easier to simply detect motor stall current.

If you’re interested in seeing what makes popular toys tick, we’ve got a number of plaything tear downs which are sure to keep you satiated until the next big holiday toy rolls around.

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Frankendrones: Toy Quads With A Hobby Grade Boost

December 18, 2017 by 3 Comments

If you’re not involved in the world of remote controlled vehicles, you may not know there’s a difference between “toy” and “hobby” grade hardware. For those in the RC community, a toy is the kind of thing you’ll find at a big box store: cheap, works OK, but lacking in features and build quality. On the other hand, hobby hardware is generally considered to be of higher quality and performance, as well as being more modular. At the risk of oversimplification: if you bought it ready to go from a store it’s probably a toy, and if you built it from parts it would generally be considered hobby grade.

But with the rock bottom prices of toy quadcopters, that line in the sand is having a harder time than ever holding some in the community back. The mashup of toy and hobby grade components is giving rise to the concept of “frankendrones” that combine the low cost of toy hardware with key upgrades from the hobby realm. Quadcopter blogger [garagedrone] has posted a roundup of modifications made to the Bayangtoys X16, a $99 quadcopter which is becoming popular in the scene.

Some of the modifications are easy enough for anyone to do. Swapping out the original propellers for ones meant for the DJI Phantom 3 increases performance and doesn’t even require tools. If you want to go a bit further down the rabbit hole, you can cut off the X16’s battery connector and replace it with a standard XT60. That lets you use standard 3S LiPo batteries, which are cheaper and higher capacity than the proprietary ones the toy shipped with.

If you have a 3D printer, there are also a number of upgraded parts you can print which will bolt right onto the X16. Payload adapters, landing gear, and GoPro mounts are all just a few clicks (and some filament) away. This library of 3D printable parts is made possible in part because the X16’s frame is itself a clone of another toy quadcopter, the popular Syma X8C. So anything listed as compatible with the Syma X8C should work with the X16 (and vice versa).

Finally, if you really want to take the X16 to the next level, you can swap out the flight controller with an open source and better supported hobby grade model. Some of these flight controllers and associated new receivers can end up costing about half as much as the X16 did to begin with, but the vast improvement in performance and capability should more than make up for the cost.

We’ve covered previous efforts to increase the performance of low cost quadcopters in the past, as well as builds that put frugality front and center. It seems that no matter what your budget is a screaming angel of death is available if you want it.

Thanks to [Calvin] for the tip.

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This Coin Cell Can Move That Train!

December 14, 2017 by 28 Comments

[Mike Rigsby] has moved a train with a coin cell. A CR2477 cell to be exact, which is to say one of the slightly more chunky examples, and the train in question isn’t the full size variety but a model railroad surrounding a Christmas tree, but nevertheless, the train moved.

A coin cell on its own will not move a model locomotive designed to run on twelve volts. So [Mark] used a boost converter to turn three volts into twelve. The coin cell has a high internal resistance, though, so first the coin cell was discharged into a couple of supercapacitors which would feed the boost converter. As his supercaps were charging, he meticulously logged the voltage over time, and found that the first one took 18 hours to charge while the second required 51 hours.

This is important and useful data for entrants to our Coin Cell Challenge, several of whom are also going for a supercap approach to provide a one-off power boost. We suspect though that he might have drawn a little more from the cell, had he selected a dedicated supercap charger circuit.

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Making Rubber Stamps With OpenSCAD

December 10, 2017 by 21 Comments

There’s an old saying that goes “If you can’t beat ’em, join ’em”, but around these parts a better version might be “If you can’t buy ’em, make ’em”. A rather large portion of the projects that have graced these pages have been the product of a hacker or maker not being able to find a commercial product to fit their needs. Or at the very least, not being able to find one that fit their budget.

GitHub user [harout] was in the market for some rubber stamps to help children learn the Armenian alphabet, but couldn’t track down a commercially available set. With a 3D printer and some OpenSCAD code, [harout] was able to turn this commercial shortcoming into a DIY success story.

Filling the molds with urethane rubber.

Rather than having to manually render each stamp, he was able to come up with a simple Bash script that calls OpenSCAD with the “-D” option. When this option is passed to OpenSCAD, it allows you to override a particular variable in the .scad file. A single OpenSCAD file is therefore able to create a stamp of any letter passed to it on the command line. The Bash script uses this option to change the variable holding the letter, renders the STL to a unique file name, and then moves on to the next letter and repeats the process.

This procedural generation of STLs is a fantastic use of OpenSCAD, and is certainly not limited to simple children’s stamps. With some improvements to the code, the script could take any given string and font and spit out a ready to print mold.

With a full set of letter molds generated, they could then be printed out and sealed with a spray acrylic lacquer. A mold release was applied to each sealed mold, and finally they were filled with approximately 200ml of Simpact urethane rubber from Smooth-On. Once the rubber cures, he popped them out of the molds and glued them onto wooden blocks. The end result looks just as good as anything you’d get from an arts and crafts store.

The process used here is very similar to the 3D printed cookie molds we’ve covered recently, though we have to assume these little morsels would not be nearly as tasty. Of course, if you had access to a small CNC machine you could cut the stamps out of the rubber directly and skip the mold step entirely.

DIY Wooden Building Blocks

December 7, 2017 by 15 Comments

If you have access to a drill press, saw, and sander, and are looking for a great present for smaller children this holiday season, [Jonny] may have you covered. He’s come up with a pretty good how to on making some simple block and dowel building blocks similar to the Tinkertoy building sets.

This is a fairly simple build if you have the shop tools, and if you only have hand tools available, is still quite doable. The blocks consist of square wooden blocks with holes drilled into them and a bunch of wooden dowels cut to size. [Jonny] adds a wooden box with a hinged lid for storing the blocks in as an added feature of the build,.

There are no LEDs lighting up, no Arduino-powered microcontroller involved, and they don’t connect to the internet, but that doesn’t make them any less of a great toy. Even without the shop tools, these could be made pretty quickly even by someone without prior experience with woodworking. If you’re interested in building block toys, check out this write-up about a way to combine different types of building blocks together, or check out this write-up about creating the frame of a DIY CNC mill with a metal building set.

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