Arduino-Controlled Signal Attenuation

Arduino-Controlled Signal Attenuation

There are many ways to modify analog and digital electrical signals, but things get a bit more complicated—or at least specialized—when working with coaxial signal transmission. To this end, Kerry D.

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Smart hydroponic assembly made with Arduino Mega

Smart hydroponic assembly made with Arduino Mega

If you love electronics as well as plants, what better way to combine the two than with a smart hydroponic system? Students at the Juan de Lanuza School decided to do just that, creating a portable hydroponic assembly that’s automatically controlled with the help of an Arduino Mega.

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“Magical” fountain bends time under Arduino control

“Magical” fountain bends time under Arduino control

Years ago, engineer and photographer Harold “Doc” Edgerton figured out how to “bend time” by pulsing a strobe light at the nearly the same speed as droplets of water, making them appear to move in slow motion, freeze, or even more backwards.

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An Arduino “Whack-a-Button” Reaction Game

An Arduino “Whack-a-Button” Reaction Game

After Instructables user R0RSHACH’s son won a place at the World Scout Jamboree in 2019, the maker decided to create a fairground-style game for fundraising. 

The resulting device is akin to a Whack-a-Mole or Batak game that can be found at high-end gyms, and features eight large light-up buttons per player on a wooden frame.

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imPulse is an energy harvesting alternative for bicycles

imPulse is an energy harvesting alternative for bicycles

Javier Betancor is developing a system that collects power as you ride a bike, with the goal of powering data collection and lighting. “imPulse” uses a stepper motor for power generation, along with a geared hub to make the motor spin at multiples of the wheel speed.

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Stepper motor utilized as a rotary encoder with Arduino

Stepper motor utilized as a rotary encoder with Arduino

Stepper motors work by alternating a series of magnets in order to rotate its shaft by a certain angle. When the shaft is manually twisted, these magnets produce an electrical signal in a predictable pattern, which as shown in the video below, can be used as an encoder with the help of an Arduino Uno.

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Morse code input for Android with Arduino

Morse code input for Android with Arduino

Morse code may not be as widely used as in its heyday, but it still certainly has its adherents. One avid user is Tanya Finlayson, who has been using this as her method of communication for roughly 40 years.

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Novel lathe control method with Arduino

Novel lathe control method with Arduino

If you want to work with round parts, a lathe is the tool to have, but takes some time to master. A full CNC version takes even more time and skill to understand, but mechanical engineer “Wade’o Design” has come up with something in between.

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