Posts | Comments

Planet Arduino

Archive for the ‘Robot’ Category

[Ivan] seems to enjoy making 3D printed vehicles with tracks. His latest one uses 50 servo motors to draw patterns in the sand at the beach. You can see it work in the video below. Well, more accurately you can see it not work and then work as the first iteration didn’t go exactly as planned.

An Arduino Mega 2560 provides the brains and the whole unit weighs in at almost 31 pounds, including the batteries. We didn’t see Ivan’s design files, although it wouldn’t be hard to do your own take on the robot.

Speaking of the weight, we were amused at [Ivan’s] quick and dirty trailer he built to haul the thing around. We wondered if he had those wheels sitting around or if he had to source them from somewhere for this project.

The robot more or less moves in a straight line and the servos either drag a pointy part into the sand or lift the pointy part up so the sand is undisturbed in that area. The robot isn’t perfect. Not only did it not work the first time, but it also looked like it dropped at least one pointy part during the second test run. The tracks seemed to provide good traction, but we would not want to bet that the motion was completely straight.

On the other hand, it did get the job done. It was a lot of wiring and we suspect that’s why it was made all in one piece. Making it break down into sections would have been nice for transport. You might even be able to make it take a varying number of sections if you did it right. However, it would take a lot of connectors and a way for those connectors to support the weight of the beam, so that would be a much tougher problem.

We wish the design files were posted, but we still thought this was a neat enough idea and easy enough to figure out. We aren’t likely to build a 30-pound robot, but we might think about replicating it on a smaller scale to take to our local beach next summer.

We couldn’t help but remember Skryf, the robot that didn’t draw in the sand but drew with sand. Then there’s also  SandBot.

It’s the end of the academic semester for many students around the globe, so here comes the flurry of DIY projects. Always a great time to check out all the cool hacks from our readers all over the world. One project that piques our interest comes courtesy of [Jason Ummel] and his Auto-Bartender.

[Jason] developed this project as a part of his robotics class taught by Professor Martinez, one of our friends at FlexiLab. Powered by one of our favorite microcontrollers, the ATmega328, the Auto-Bartender is driven by a single 12 V motor coupled with 10 individual valves for separate drinks. Drinks are pumped into a cup sitting on top of a scale, allowing the device to know how much of each drink has been dispensed. The entire setup is controlled using a smartphone application developed in MIT App Inventor, a super-easy way to prototype Android applications.

Furthermore, [Jason] incorporated a number of user-centered design considerations into his project. These include an LCD to display updates, a green LED to indicate the device is in progress, and a buzzer to let the user know the drink is complete.

We really like the combination of craftsmanship, electronics hardware design, and software development that [Jason] put into his project. It’s the kind of project we know our readers will enjoy.

It looks like Jason substituted tap water for Whiskey and Dr. Pepper for his demo. Not exactly what we had in mind, but I guess he still has exams to finish.

Cool project [Jason]! We can’t wait to see Auto-Bartender on Hackaday.io.

Bottoms up!

For the Warman Design and Build Competition in Sydney last month, Redditor ‘Travman_16 and team created an excellent Arduino-powered entry. The contest involved picking up 20 payloads (AKA balls) from a trough, and delivering them to a target trough several feet away in under 60 seconds.

Their autonomous project uses Mecanum wheels to move in any direction, plus a four-servo arm to collect balls in a box-like scoop made out of aluminum sheet. 

An Arduino Mega controls four DC gear motors via four IBT-4 drivers, while a Nano handles the servos. As seen in the video, it pops out of the starting area, sweeps up the balls and places them in the correct area at an impressive ~15 seconds. 

It manages to secure all but one ball on this run, and although that small omission was frustrating, the robot was still able to take fifth out of 19 teams. 

For the Warman Design and Build Competition in Sydney last month, Redditor ‘Travman_16 and team created an excellent Arduino-powered entry. The contest involved picking up 20 payloads (AKA balls) from a trough, and delivering them to a target trough several feet away in under 60 seconds.

Their autonomous project uses Mecanum wheels to move in any direction, plus a four-servo arm to collect balls in a box-like scoop made out of aluminum sheet. 

An Arduino Mega controls four DC gear motors via four IBT-4 drivers, while a Nano handles the servos. As seen in the video, it pops out of the starting area, sweeps up the balls and places them in the correct area at an impressive ~15 seconds. 

It manages to secure all but one ball on this run, and although that small omission was frustrating, the robot was still able to take fifth out of 19 teams. 

For an electronics person, building the mechanics of a robot — especially a robust robot — can be somewhat daunting. [Jithin] started with an off-the-shelf 4 wheel drive chassis to build an off-road Arduino robot he calls the Badland Brawler. The kit was a bit over $100, but as you can see in the video below, it is pretty substantial, with an enclosed frame and large mud tires.

The remaining parts include an Arduino, a battery, and a motor driver IC. The Arduino is one with WiFi (an MKR 1000, in fact) and there’s a phone app for controlling the robot.

Honestly, once you have the chassis taken care of, the rest is pretty easy. Of course, the phone app is a bit more effort, but you could replace it in a number of ways. Blynk, comes to mind, for example.

The motor drivers are easy to figure out. This would be a great platform for some sensors to allow for more autonomy. We liked how the frame had mount points for a lot of different boards and sensors and could hold everything, for the most part, inside. That’s probably a good idea for a robot which will be traversing rugged terrain.

If you do decide to roll your own app with Blynk, we’ve done it with a very different kind of robot. Four-wheel drive robots don’t have to be big, as we’ve seen in the past.

For an electronics person, building the mechanics of a robot — especially a robust robot — can be somewhat daunting. [Jithin] started with an off-the-shelf 4 wheel drive chassis to build an off-road Arduino robot he calls the Badland Brawler. The kit was a bit over $100, but as you can see in the video below, it is pretty substantial, with an enclosed frame and large mud tires.

The remaining parts include an Arduino, a battery, and a motor driver IC. The Arduino is one with WiFi (an MKR 1000, in fact) and there’s a phone app for controlling the robot.

Honestly, once you have the chassis taken care of, the rest is pretty easy. Of course, the phone app is a bit more effort, but you could replace it in a number of ways. Blynk, comes to mind, for example.

The motor drivers are easy to figure out. This would be a great platform for some sensors to allow for more autonomy. We liked how the frame had mount points for a lot of different boards and sensors and could hold everything, for the most part, inside. That’s probably a good idea for a robot which will be traversing rugged terrain.

If you do decide to roll your own app with Blynk, we’ve done it with a very different kind of robot. Four-wheel drive robots don’t have to be big, as we’ve seen in the past.

We don’t think we’d want to trust our fire safety to a robot carrying a few ounces of water, but as a demonstration or science project, [Tinker Guru’s] firefighting robot was an entertaining answer to the question: “What do I do with that flame sensor that came in the big box of Arduino sensors I bought from China?” You can see a video of the device below.

You can see, it is a pretty standard two-wheel robot with the drive wheels to the rear and a skid plate up front. There are a flame sensor and a water pump up forward, as well. You can probably guess, the device notices a flame and rushes to squirt water on it.

That got us thinking, though. What would it take to build a real robot fireman? Turns out you don’t have to look hard to find out there are several out there already. The Thermite robot seems to have a lot of traction — in the market, that is, although its oversized treads probably give it good traction in that way, too. Most of the robots don’t carry their own water, and there’s even one — THOR — that looks like a human. Well, as much as a pie looks like a cake, anyway.

Interestingly, none seem to carry any sort of chemical fire extinguisher. Of course, we’ve seen cases where water was the best, anyway. If you want a slightly more practical home build — but only slightly — check out [Ivan’s] robot that holds a liter of water.

A robotic arm is an excellent idea if you’re looking to get started with electromechanical projects. There’s linkages to design, and motors to drive, but there’s also the matter of control. This is referred to as “kinematics”, and can be considered in both the forward and inverse sense. [aerdronix] built a robotic arm build that works in both ways.

The brains of the build is an Arduino Yun, which receives commands over the USB interface. Control is realised through the Blynk app, which allows IoT projects to easily build apps for smartphones that can be published to the usual platforms.

The arm’s position is controlled in two fashions. When configured to use inverse kinematics, the user commands an end effector position, and the arm figures out the necessary position of the linkages to make it happen. However, the arm can also be used in a forward kinematics mode, where the individual joint positions are commanded, which then determine the end effector’s final position.

Overall, it’s a well-documented build that lays out everything from the basic mechanical design to the software and source code required to control the system. It’s an excellent learning resource for the newcomer, and such an arm could readily be used in more complex projects.

We see plenty of robotic arms around these parts, like this fantastic build based on an IKEA lamp. If you’ve got one, be sure to hit up the tip line. Video after the break.

When you think of sports, you usually think of something that takes a lot of physical effort. Golf is a bit different. Sure, you can get some walking in if you don’t take a cart. But mostly golfing is about coordination and skill and less about physical exertion. Until you want to practice driving. You hit a bucket of balls and then you have to go walk around and pick them up. Unless you have help, of course. In particular, you can delegate the task to a robot.

The robot that [webzuweb] built looks a little like a plywood robot vacuum. However, instead of suction, it uses some plywood disks to lift the balls and deposit them in a hopper. The electronics consist of an Arduino and an Orange Pi Lite. A GPS tells the robot where it is and it develops a search pattern based on its location.

Although [webzuweb] notes he isn’t done with the project, it looks pretty good. He describes the software, but it doesn’t appear to be posted anywhere. However, he does describe its operation and how it changes mode based on its current state.

We can’t decide if golf is really a sport or more of a game. We were surprised to read that if you carry your own bag and don’t use a cart you can burn about 360 calories an hour which is somehow more than a gymnast burns, which hardly seems possible.

Of course, most people use a cart and a caddy, so they aren’t going to burn those calories. If you are in the market for a cool cart, we liked this one. Or, perhaps you’d like one with more power.

Ever find yourself with nineteen nameless robot vacuums lying around? No? Well, [Aaron Christophel] likes to live a different life, filled with zebra print robots (translated). After tearing a couple down, only ten vacuums remain — casualties are to be expected. Through their sacrifice, he found a STM32F101VBT6 processor acting as the brains for the survivors. Coincidentally, there’s a project called STM32duino designed to get those processors working with the Arduino IDE we either love or hate. [Aaron Christophel] quickly added a variant board through the project and buckled down.

Of course, he simply had to get BLINK up and running, using the back-light of the LCD screen on top of the robots. From there, the STM32 processors gave him a whole 80 GPIO pins to play with. With a considerable amount of tinkering, he had every sensor, motor, and light under his control. Considering how each of them came with a remote control, several infra-red sensors, and wheels, [Aaron Christophel] now has a small robotic fleet at his beck and call. His workshop must be immaculate by now. Maybe he’ll add a way for the vacuums to communicate with each other next. One robot gets the job done, but a whole team gets the job done in style, especially with a zebra print cleaner at the forefront.

If you want to see more of his work, he has quite a few videos on his website demonstrating the before and after of the project — just make sure to bring a translator. He even has a handy pinout for those looking to replicate his work. If you want to dive right in to STM32 programming, we have a nice article on how to get it up and debugged. Otherwise, enjoy [Aaron Christophel]’s demonstration of the eight infra-red range sensors and the custom firmware running them.



  • Newsletter

    Sign up for the PlanetArduino Newsletter, which delivers the most popular articles via e-mail to your inbox every week. Just fill in the information below and submit.

  • Like Us on Facebook