Tag Archives: Micro

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

via Arduino Blog

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 lot going on behind the scenes.

In his video, Daniel Raines shows off a pair of prototype access control units (ACUs) that he’s constructed. The two networked devices are each based on a Raspberry Pi Compute Module 4 along with an Arduino Micro that controls six relays to allow or deny entry, provide feedback, fire, and lock up.

More details on the project can be found in Raines’ clip below.

Upgrade your flight sim setup with Tom Stanton’s floor-mounted joystick

via Arduino Blog

Most joysticks sit on your desktop, allowing you to control flight sims and other such games with a bit more realism than a keyboard and mouse. YouTuber Tom Stanton, however, decided to take things to the next level by creating one that pivots from the floor out of aluminum extrusion and 3D-printed parts.

The device’s main control stick attaches the base via a ball bearing pivot system, using Hall effect sensors to detect its relatively limited rotational distance. Foot pedals are also implemented with a Hall effect sensor setup, and a throttle/switch/button interface is presented to the user by another extrusion section. The build interfaces with a computer using an Arduino Micro and the Arduino Joystick Library.

Code for the project is available on GitHub, while print files can be found on Thingiverse if you’d like to make your own!

This air hockey robot never loses

via Arduino Blog

Air hockey is normally a two-player affair, but not for this student-built robot. The table features a designated human goal with a touchscreen GUI for settings and control. The second goal is guarded by an autonomous striker, attached to a pair of steppers using a drive belt arrangement.

The robotic device analyzes the puck position with an overhead camera and a Raspberry Pi, which passes commands to an Arduino Micro over serial. The Arduino then controls the stepper movements via driver modules, as well as a solenoid to pop the puck out of the robot’s goal on the rare occasion it misses a block.

You can see more on the build in the two videos below!

Enjoy VR games on your PC with this Arduino-based DIY headset

via Arduino Blog

If you want a virtual reality headset for your computer, but don’t want to dig deep into your pockets, this project by “jamesvdberg” (AKA Killer Robotics) presents a low-cost alternative. 

Although it won’t pack the capabilities of an Oculus or HTC Vive, jamesvdberg’s VR rig can be replicated for just $80 using a Google cardboard-compatible shell, along with a 5” Raspberry Pi 800×480 LCD screen and an Arduino Micro for control.

The DIY device tracks head movements using an MPU6050 IMU, sending data to a PC system as a mouse input via the Micro. Game visuals are fed back to the screen over HDMI, split into discreet images for each eye, creating a side-by-side 3D effect. 

Those interested in building their own version can find the tutorial here.  

This retro-looking rotary cellphone is free of modern-day distractions

via Arduino Blog

What we carry today in our pockets is nominally called a “phone,” but more often than not we’re using it to do various other computing tasks. Justine Haupt, however, wanted an actual phone that “goes as far from having a touchscreen as [she could] imagine.”

What she came up with is a rotary cellphone that’s not just a show-and-tell piece, but is intended to be her primary mobile device. It’s reasonably portable, has a removable antenna for excellent reception, a 10-increment signal meter, and, perhaps most importantly, doesn’t make her go through a bunch of menus to actually use it as a phone. Other features include number storage for those she calls most often and a curved ePaper display that naturally doesn’t use any power when revealing a fixed message.

The project was prototyped using an Arduino Micro. It was then laid out of a PCB with an an Adafruit FONA 3G board and an ATmega2560V, programmed in the Arduino IDE.

Haupt has published a detailed look at the build process here.

Designing an extremely realistic animatronic heart with Arduino

via Arduino Blog

In his latest video, Will Cogley has created an animatronic heart so realistic that you might wonder if it’s the actual thing. 

The device is made out of molded silicon with fake blood poured on top to enhance the effect, and inside a trio of servo motors push the lower and upper sections of the prop out in a very lifelike pattern. 

Control is via an Arduino Micro along with an I2C servo controller, while power is provided by an external tether. A potentiometer on the back is used to vary heartbeat speed. 

He also made a simpler — and less potentially terrifying — version with a cloth exterior. This one is battery-operated and runs on a motor and linkage system, perhaps making it good for a nice portable joke!