After coming across Carbon Design Group’s Domino Wall Clock, which uses electronic magnetic coil motors to reveal white dots, Instructables member “Kothe” decided to create a simplified version of their own.
The clock is comprised of three custom dominoes — the first tile for hours, the second and third for minutes. Unlike its inspiration, Kothe’s device uses addressable RGB LEDs as dots that allow for a variety of colors to shine through.
The unique timepiece is made out of cut MDF, acrylic, and 3D-printed outer sections. Everything is controlled by an Arduino Nano, along with a DS1307 RTC unit for accurate timekeeping.
If you play beer pong, whether with adult beverages, water, or soda, it’s possible you find it too repetitive or too easy. While one might see this as a self-correcting problem, to take things up a few notches Ty Palowski created a specialized table with moving cups.
The custom setup oscillates the cup pyramids back and forth under the power of a stepper motor, belt, and magnet assembly under the table. These magnets pull on corresponding magnets attached to the bottom of each cup, causing them to slide “like magic” on top of an acrylic surface.
Palowski’s system is controlled by an Arduino Nano with a rotary encoder and OLED interface. As shown in the video below, both sides of the table are motorized in the same manner for a two-player challenge!
When creator mattb_138’s parents were cleaning out their house, he came across an old cassette player and decided to upgrade it with MP3 capabilities and an RFID interface.
The newly-enhanced device uses an Arduino Nano for control, along with a DFPlayer Mini module to play songs stored on a microSD card. An RC522 reader enables him to select tracks based on RFID cards, printed with their appropriate album art.
The cassette player’s internals are kept largely stock, using a potentiometer to adjust the volume of the original speakers. Two buttons are also implemented with long and short press functionality, allowing for pause/play, skip, shuffle, and selection between A/B “side” of each card.
Labels are easy enough to take off of a roll, but doing so repeatedly while trying to keep count, could perhaps change one’s mind. If you find yourself having to apply label after label… after label, then an Arduino-based dispenser like Mr Innovative’s could be just the thing you need to streamline the process.
The automated machine uses a stepper motor to pull labels past a series of rods, separating the sticky-backed “FRAGILE” sign upon encountering an especially abrupt change in direction. An IR sensor beneath detects the presence of the label, keeping the device from advancing further until it’s removed.
An Arduino Nano on a custom PCB, along with an A4988 driver control the rig. User input consists of a rotary knob and push button, and a 16×2 LCD display shows the number of labels dispensed as well as the label length during setup.
For an easy DIY metal detector setup, look no further than this project by creator “rgco.”
The handheld device uses a 20-60 turn coil of 26AWG enameled wire, connected across an Arduino Uno or Nano’s pins 8 and 10. A series of pulses is continuously sent out by pin 10, which are delayed in reaching pin 8 according to the inductance across the coil. As this coil approaches other metallic objects, the effective inductance changes, thus varying the delay in the signal reaching pin 10.
This effect is sensed by the Arduino, outputting chirps on a buzzer as audio feedback when metal is nearby. To convert it into a practical device, the Nano configuration is stuffed into a Tic Tac container, with the coil held at a distance with two skewer sticks.
With an Arduino, 10m of wire and a 100 Ohm resistor you can build a metal detector in 10 minutes! It is based on sound physics and works for a large range of coil sizes and shapes. The sensitivity is not enough for treasure-hunting, but it can be made into a small hand-held device that is very useful indoors to check for the presence of metals. It will help you find nails inside wood or heating pipes in the wall, and to check the composition of tools and furniture. The method can also be used to integrate as a sensor, integrated with more elaborate projects.
YouTuber Brankly is going to be giving out candy in style this Halloween. Or, more accurately, his automated pumpkin system is going to take care of the task for him.
His large fake jack-o’-lantern sits atop a hilariously smaller skeleton body, and hides inside a servo-driven turntable dispensing mechanism. As it rotates, treats are pushed out of a tongue-like slide mechanism, where it’s detected by two infrared sensors. This detection stops (and reverses) the dispensing plate, while the bowl in front illuminates.
Sounds and lighting are recycled from the modified bowl and pumpkin assembly, and LEDs under control of an Arduino Nano are added to a large button box that starts the cycle. Another Nano runs the rest of the setup, along with a stepper driver board and voltage regulator on a custom PCB.