You may have seen Mark Rober’s automated dartboard or Stuff Made Here’s backboard, which use advanced engineering to create apparatuses that ensure you “can’t miss.” Now that summer is in full swing, what about a robotic cornhole board?
When a bean bag is thrown, the camera feeds the video over to a laptop running a Processing sketch to analyze its trajectory and passes adjustment info to an Arduino. This then controls the motors for repositioning, which attempts to predict where the bag will land and guide it into the hold for three points!
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.
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.
As a prototype for a continuously printing art project, Norbert (AKA “HomoFaciens”) has built an inkjet printer that uses an Arduino and the mechanics of a discarded 3D printer 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.