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Poisonous plants, like poison ivy, can really ruin your day. In an effort to combat this “green menace,” YouTuber Sciencish decided to create his own quadruped robot.

The robotic dog is equipped with two servos per leg, for a total eight, which enable it to move its shoulders and elbows back and forth.

An Arduino Uno controller determines leg positions via trigonometric calculation, and when in position, it dispenses weed killer via a relay and aquarium pump setup. The reservoir can also be used to hold other liquids, whether for watering duties or even to provide extra fuel to a fire.

Do you love to bowl? Are you still unable to do so due to the pandemic? Then this project by high school engineering teacher “lainealison” is right up your alley!

This rig features a 5½ foot (1.68 meter) lane made of MDF, along with ball bearings used to strike miniature pins. Each pin is arranged on top of an LDR sensor, which detects whether a pin remains in place or if it has been knocked over via 10 LEDs shining from overhead.

An Arduino Uno uses pin presence information to output game stats, automatically displaying the frame, ball and score on an I2C LCD screen.

You can find more on the project, including code and construction details, in lainealison’s write-up.

If you’d like to build a walking biped robot, this 3D-printed design by Technovation looks like a fantastic place to start. Each leg features three servos that actuate it at the hip, knee, and ankle for a total of six degrees of freedom.

Control is handled by an Arduino Uno board that rides on top of the legs, along with a perfboard to connect to the servos directly.

Movements are calculated via inverse kinematics, meaning one simply has to input the x and z positions, and the Arduino calculates the proper servo angles. The bot is even able to take steps between two and 10 centimeters without falling over.

While electronics and water don’t generally mix, researchers at Ochanomizu University in Japan have come up with an ephemeral display method that uses floating clusters of bubbles to show messages on a liquid surface.

The device, known as UTAKATA, utilizes a line of seven electrodes under Arduino Uno control that activate to form hydrogen bubbles via electrolysis. When arranged properly, these bubbles can be made to produce letters and words, which as shown in the video below, dissipate as they flow downstream in the container.

UTAKATA follows previous work where a static configuration of bubbles was used as the output. This water output gives a much better refresh rate, along with an interesting visual effect.

More details are available in the researchers’ paper.

As a prototype for a continuously printing art project, Norbert (AKA “HomoFaciens”) has built an inkjet printer that uses an Arduino and a discarded 3D printer’s frame to slowly generate black and white images. 

The hacked together assembly mounts the Uno, associated electronics, and an HP 6602 cartridge onto a piece of hardboard, which is attached to the X-axis assembly of the former 3D printer. 

Print height is set by manual manipulation of the Z-axis. The Arduino can then move the printer in the X/Y direction via the two steppers, and print by passing current to the cartridge’s nozzles in short bursts. 

“The electronics consist of a computer power supply that provides 12V DC, a boost-up converter that raises this voltage to 18V, an Arduino UNO that generates the control pulses and two ULN2803 chips that convert the 5V of the GPIOs to 18V level.”

As seen in the video below, the contraption appears to work well after some experimentation. 

In the Harry Potter series, professor Alastor Moody is known for wearing a very distinct prosthetic eyeball that moves in a “mad” manner. When Instructables member replayreb’s son decided to go to a costume party dressed as this character, he took the opportunity to make a replica for him

The device is controlled by an Arduino Uno stored in a wearer’s pocket and transmits signals to the eyepiece via a 3.5mm stereo jack. A servo then actuates half of a ping pong ball decorated with an iris and pupil to create the Mad-Eye effect. 

A potentiometer is also hooked up to the Uno, allowing the mock Moody to complement the motion of the fake eye with the one that’s exposed.

Geoff (AKA Facio Ergo Sum) has created a new take on the classic “tin can telephone,” using an Arduino and nRF24L01 transceiver to pass audio signals instead of a physical string. 

The build and testing process are outlined in the video below, including poking holes for an antenna and talk button, as well as hot gluing everything in place.

More specifics can be found in Geoff’s project write-up, and along with the RF unit, it uses an Uno to run a transmission program. Batteries, a speaker, amp, and microphone are also implemented, enabling a pair of these cans to communicate from what appears to be well over 100 meters away.

Iron Man Arc Reactors have brought joy to makers of all ages, whether as something cool on a movie screen, as a hacked together light assembly, or even a cosplay prop created from a DIY kit. Michael Klements decided to turn one of these kits into something more, by hooking it up to act as a CPU performance monitor for his computer.

His handy desktop device runs a Python script on the monitored PC, which passes along CPU information over serial to an Arduino Uno. The Uno pulses the Arc Reactor in proportion to the computer load using a transistor, with higher frequency pulses indicating a heavily loaded CPU and lower frequencies for lower CPU usage. An OLED display is also implemented for numerical feedback, and everything is housed in a nice 3D-printed stand.

More details, including files and code, are available in Klements’ blog post

The Internet has been perhaps more important than ever to keep us connected these days. Available technology, however, apparently wasn’t good enough for brothers Hunter and Josh Irving, who built their own telepresence robot using parts on-hand during their own two-person hackathon.

The robot they came up with, dubbed TELEBOT, features a partially 3D-printed face along with a set of chattering teeth and eyes recycled from an antique doll. An Arduino Uno is used to take audio signals from remote “guests,” simulating their facial expressions with servos that drive its mouth and LED-lit eyes. 

The duo designed TELEBOT’s “body” out of an adjustable lamp for manual movement. And, as an added bonus, the device is capable of glowing in the dark and can be customized with a wizard, cowboy or top hat. 

While it might not be the most comforting robot you’ve ever seen, it looks like a fun build! 

Daniel Hingston wanted to build a four-legged walking robot for several years, and with current coronavirus restrictions he finally got his chance. His 3D-printed robodog, dubbed “GoodBoy,” is reminiscent of a miniature version of Boston Dynamics’ Spot, which helped inspired the project. 

It’s extremely clean, with wiring integrated into the legs mid-print. Two micro servos per leg move it in a forward direction, controlled by an Arduino Uno.

Obstacle avoidance is provided by a pair of ultrasonic sensor “eyes,” allowing it to stop when something is in its path. An LDR sensor is also implemented, which when covered by its human minder commands it to present its paw for shaking.

Be sure to check out a short demo of GoodBoy below! 

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