Bluetooth RC Car Packs In A Few Sensors

November 13, 2021 by Lewin Day 4 Comments

Have you ever been walking around the house, desperate to know the ambient temperature, humidity, and barometric pressure? Have you ever wanted to capture that data with a small remote-controlled platform? If so, this project from [TUENHIDIY] will be exactly what you’ve been looking for.

The little remote-control car is built around a Seeed Wio Terminal. This is a microcontroller platform that comes with a screen already attached, along with wireless hardware baked in and Grove connectors for hooking up external modules. Thus, the car adds a DHT11 temperature and humidity sensor, along with a BMP280 air pressure sensor using the Grove connectors.

Driving the car is done via a Blynk smartphone app that communicates with the Wio Terminal. Small DC motors at each wheel are driven via a DFRobot quad-motor shield. With the built-in screen, the RC car displays commands received from the smartphone app, as well as the temperature, humidity and pressure in the immediate environment.

We really like the simple PVC-based chassis design, and it’s a straightforward project that demonstrates how to build a Bluetooth-controlled car. Data collected by the sensors is also visible on the smartphone app, so if you need to sample conditions in the next room without getting off the couch, you could do that pretty easily.

Projects like these are a good way to get familiar with working with motors and sensors. It’d be a great base for simple robotics development, too. We’ve featured builds from [TUENHIDIY] before, too, like this great rotary plotter that can draw on bottles. Video after the break.

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Adding Brakes To Actuated Fingers

November 8, 2021 by Bryan Cockfield 10 Comments

Building exoskeletons for people is a rapidly growing branch of robotics. Whether it’s improving the natural abilities of humans with added strength or helping those with disabilities, the field has plenty of room for new inventions for the augmentation of humans. One of the latest comes to us from a team out of the University of Chicago who recently demonstrated a method of adding brakes to a robotic glove which gives impressive digital control (PDF warning).

The robotic glove is known as DextrEMS but doesn’t actually move the fingers itself. That is handled by a series of electrodes on the forearm which stimulate the finger muscles using Electrical Muscle Stimulation (EMS), hence the name. The problem with EMS for manipulating fingers is that the precision isn’t that great and it tends to cause oscillations. That’s where the glove comes in: each finger includes a series of ratcheting mechanisms that act as brakes which can position the fingers precisely enough to make intelligible signs in sign language or even play a guitar or piano.

For anyone interested in robotics or exoskeletons, the white paper is worth a read. Adding this level of precision to an exoskeleton that manipulates something as small as the fingers opens up a brave new world of robotics, but if you’re looking for something that operates on the scale of an entire human body, take a look at this full-size strength-multiplying exoskeleton that can help you lift superhuman amounts of weight.

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Battle Robot Uses Carbon Fiber To Save Weight

November 5, 2021 by Lewin Day 9 Comments

ZAP! The saw is capable of delivering high-voltage discharges to damage its foes.

Combat robots come in all shapes and sizes, with regulating authorities often using weight limits to create a level playing field for competitors. [Hans Jørgen Grimstad] is building a robot to compete in a 4 kg class, and made some interesting design decisions to that end.

4 kg is not a lot of weight to play with. When considering the motors needed to propel the robot and the batteries needed to run everything, there’s then precious little weight left for weapons systems and armor plating.

Thus, in an effort to make the most of the weight limitations, [Hans] decided to use carbon fiber for the robot’s outer shell. The method used is a simple wet layup in a mold. We’d be supremely interested to see how this armor holds up in competition, versus more typical choices like aluminium and steel.

Other interesting features include a belt-driven saw, which [Hans] tests with his hands mere inches away and the robot’s motors powered up. Don’t do this if you value your fingers. This is paired with a high-voltage discharge taser module. When the saw gets close to another robot, it may cause sparks to jump to the enemy, damaging its electronics in the process. It’s something we haven’t seen too often, as such measures are actually banned in some contests.

Diehard enthusiasts in the battle robot community will likely have fierce opinions on many points of the design; have it out in the comments. It’s certainly not the first carbon-fiber bot, but it’s nice to see the fancy material being thrown in the ring.

We’ve seen other designers innovate, too, such as this remarkably successful walking robot build. Video after the break.

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Hacking The Mekamon Robot To Add New Capabilities

November 3, 2021 by Lewin Day 6 Comments

The Mekamon from Reach Robotics is a neat thing, a robot controlled by a phone app that walks on four legs. [Wes Freeman] decided to hack the platform, giving it a sensor package and enabling some basic autonomous behaviours in the process.

[Wes] started out by using a packet sniffer to figure out the command system for controlling the Mekamon robot over Bluetooth. Then, he set about fitting a Raspberry Pi 3 on the ‘bot, along with a Pi Camera on a gimballed camera head.

Running OpenCV on the Raspberry Pi gives the Mekamon robot the ability to follow a colored ball placed in its field of vision. Later work involved upgrading the hardware to a Pi Compute Module 3, with its dual camera inputs allowing for the use of a stereo imaging setup.

All the parts simply ziptie on top of the original robot, with no permanent changes needed. It’s a neat way of hacking, by expanding the original capabilities without actually having to tamper within.

We’ve seen plenty of autonomous builds over the years, from farming robots to those designed to explore the urban environment. Video after the break.

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Janksy Robot Paints Murals One Dot At A Time

November 2, 2021 by Adam Fabio 22 Comments

[Stuff Made Here] has a new shop, with a huge blank wall. A blank white wall just wouldn’t do, so rather than paint the wall himself, he designed a robot to do it for him. (Video, embedded below.)

The result is Janksy. A huge machine made of metal, wood, and 3D printed parts. Janksy is an ingenious design in that it has two sets of X and Y axis. A large, slow-moving system of rails and cables positions the robot roughly in the right area of the wall. From there a much smaller, but faster and more precise motion system makes the final moves.

The “business end” of Janksy is of course a paint sprayer; in this case a Harbor Freight model. The medium of choice is acrylic paint, as Janksy will be painting for several days, and didn’t want to gas himself with the volatile solvents of more traditional paints.

Janksy mainly sprays dots of paint. Up close you’ll only see the dots, but step back a bit and a full image takes shape. It’s a technique called Pointillism, which puts Janksy in the company of artists like Georges Seurat and
Vincent van Gogh.

While human artists mix colors to produce the hue they want, robots can’t easily do that. [Stuff Made Here] spends quite a bit of time explaining basic color theory, and how dots of cyan, magenta, and yellow will combine in the eye to produce colors – much the way a monitor uses pixels of red, green, and blue light.

After all this work, you might be wondering what [Stuff Made Here] would want on his wall. Well, let’s just say that he loves his wife, even though his pranks on here often elicit an exasperated glare. Watch the video after the break for the full story.

You don’t have to build a huge drawing robot though – we’ve seen some great plotters on a much smaller scale, including one that will play tic-tac-toe.

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Waterjet-Powered Speedboat For Fun And Research

November 1, 2021 by Bryan Cockfield 1 Comment

There are a lot of cliches about the perils of boat ownership. “The best two days of a boat owner’s life are the day they buy their boat, and the day they sell it” immediately springs to mind, for example, but there is a loophole to an otherwise bottomless pit of boat ownership: building a small robotic speedboat instead of owning the full-size version. Not only will you save loads of money and frustration, but you can also use your 3D-printed boat as a base for educational and research projects.

The autonomous speedboats have a modular hull design to make them easy to 3D print, and they use a waterjet for propulsion which improves their reliability in shallow waters and reduces the likelihood that they will get tangled on anything or injure an animal or human. The platform is specifically designed to be able to house any of a wide array of sensors to enable people to easily perform automated tasks in bodies of water such as monitoring for pollution, search-and-rescue, and various inspections. A monohull version with a single jet was prototyped first, but eventually a twin-hulled catamaran with two jets was produced which improved the stability and reliability of the platform.

All of the files needed to get started with your own autonomous (or remote-controlled) speedboat are available on the project’s page. The creators are hopeful that this platform suits a wide variety of needs and that a community is created of technology enthusiasts, engineers, and researchers working on autonomous marine robotic platforms. If you’d prefer to ditch the motor, though, we have seen a few autonomous sailboats used for research purposes as well.

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Really Robotic Robot Costume Will Probably Win The Contest

October 28, 2021 by Kristina Panos 8 Comments

Still don’t have anything to wear to that Halloween party this weekend? Or worse, your kid hasn’t decided on a costume that you both can agree on? Well, look no further than [Natasha Dzurny]’s Sally Servo the Really Robotic Robot Costume and accompanying multi-part build guide. You might want to start by raiding that recycle bin for cardboard, because you’re going to need a lot of it.

What you won’t need a lot of is hard-to-source parts, at least if you build it the [Natasha] and Brown Dog Gadgets way. Even so, there are a ton of cool moving and blinking bits and bobs to be made with servos, LEDs, and RGB LEDs connected up to something kid-friendly like the Micro:bit and the Brown Dog Gadgets Bit Board — that’s a base for the :bit that lets users connect components via LEGO and conductive tape.

Between Sally’s robotic googly eyes and her light-up belt, there are plenty of ideas here to steal and make your own, and each one is packaged in a great-looking guide complete with paper printing templates.

Our favorite part has to be the infinity mirror heart, which appears to be beating thanks to clever programming. That, and the costume details, like the waist-area wires running between the upper and lower pieces.

Is the party at your house? There’s probably still enough time to put together a projector-based stomping game for the driveway.