Annin Robotics AR4 Mark 5. The combo kit is $1,189. With stepper motors and drivers, it's $1,800. That's about 290,000 Japanese yen. If you have a 3D printer and a soldering iron, you can assemble it.

Split-flap displays are a great, low-power way to display text to a wide audience. Compared to other display technologies like LCDs they only use energy when the characters change, but have fallen out ...

If you grew up playing with LOGO on an old 8-bit computer, you’re probably familiar with the concept of a drawbot. It’s a simple robot that drags a pen around to draw on paper. [Tim] decided to build ...

A stepper motor's coils need more current than a GPIO pin can supply directly. The ULN2003 board sits between the ESP32-S3 and the motor, amplifying 4 weak digital signals (IN1 – IN4) into the ...

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