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Access control unit designed with a Raspberry Pi CM4 and an Arduino Micro

Whether granting access to public transit or restricting unauthorized personnel in buildings, NFC card readers can be extremely useful. Although most might not consider how they work – and simply happy getting through a turnstile – there’s a lot going on behind the scenes. In his video, Daniel Raines shows off a pair of prototype access control...

2002 Audio TT dashboard gets a digital speedometer upgrade with a custom CAN bus shield

While it’s hard to beat analog instruments for instantaneous automotive feedback, Finnish electrical engineering student Jussi Ristiniemi also wanted a digital speed readout on his 2002 Audi TT. His particular model normally uses the car’s controller area network (CAN) to transmit the radio station or CD track to the uppermost section of the...

Turn your staircase into a flaircase with this LED system

If you live in a house with stairs and have to traipse up and down at night, it’s best to have some sort of light that guides you. Although a cell phone can work just fine, or you could likely activate bright overhead lighting, creator MagicManu devised an automatic and progressive solution to illuminate his path instead. MagicManu’s system knows...

Welcome Raspberry Pi to the world of microcontrollers

‘Raspberry and chips,’ not something you’d like to eat but in the world of silicon it’s actually a great combination. Eben Upton recently shared with us Raspberry Pi’s exciting vision for a revolutionary product that they were working on: a microcontroller, the RP2040, based on Raspberry Pi silicon. The news was both disruptive and exciting at...

Homemade machine puts a new spin on winding yarn

If you’ve ever wanted to wind balls of yarn, then look no further than this automated machine from Mr Innovative. The YouTuber’s DIY device is powered by an Arduino Nano and an A4988 stepper driver, spinning up a round conglomeration of yarn via a NEMA17 motor and a timing belt. The ball is wound on an offset spindle, which is mechanically controlled...

James Bruton demonstrates the Coanda effect with an Arduino-controlled rig

The Coanda effect, as you may or may not know, is what causes flowing air to follow a convex surface. In his latest video, James Bruton shows how the concept can used as a sort of inverted ping pong ball waterfall or staircase. His 3D-printed rig pushes balls up from one fan stage to another, employing curved ducts to guide the lightweight orbs...

This Arduino-based speed bag counts your punches

Creator DuctTapeMechanic loves sports and electronics, so for a recent project he decided to combine his two passions by hacking a speed bag to keep track of his punches. As shown in the video below, the first step was to get it physically set up, modding an old metal bed frame into a support structure. He also added a recessed NPN capacitive...

3D-printed mobile robot platform based on the Arduino Due

Although an Arduino can be a great way to provide computing power for a mobile robot, you’ll need a variety of other electronics and mechanical components to get it going. In his write-up, computer science student Niels Post outlines how he constructed a robotic platform that travels via two stepper motors, along with casters to keep it upright. Its...

Making your own Segway, the Arduino way

After obtaining motors from a broken wheelchair, this father-son duo went to work turning them into a new “Segway.” The DIY transporter is controlled by an Arduino Uno, along with a pair of motor drivers that handle the device’s high current needs. An MPU-6050 allows it to react as the rider leans forward and backwards, moving with the help...

Old keyboard turned into a new children’s learning toy

Peter Turczak’s toddler son loves “technical stuff,” especially things like keyboards and computers that adults use. After discussing this with other likeminded technical parents, the idea of giving new life to an old (PS/2 or AT) keyboard as a teaching tool was hatched.  The hacker thus added an Arduino Nano, a speaker, and an SD card reader...

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