LEGO Motor Box with Arduino NANO and L298D Shield

thingiverse

I designed a "LEGO Motor Box" to get more out of LEGO Power Functions motors than just using the remote control. It's simply an Arduino NANO on an L298D engine driver shield with some basic wiring. It fits perfectly with LEGO as shown and measures 4x12 bricks in size. The height is also compatible, but what really matters here is the impeccable 3D printing of the lower surface. The vents aren't necessary, I think. On both sides are A3144 Hall sensors, activated by a magnet in the yellow 4x4 brick and serving as a switch. LEGO cables are fully compatible too. The motors used are brushed DC motors, but a LEGO Power Functions Servo won't work because these 9V motors run on PWM (check out the LEGO Power PINOUT here: https://scuttlebots.com/2014/03/02/lego-pf-hacking-wiring/). The attached 9V or GND are also switchable per channel using IRLU2905Z N-Channel mosfet (I had some leftover, a bit oversized). In the photos, I'm using a 9V power supply, but of course it works just as well with the LEGO battery box. https://www.lego.com/de-de/themes/power-functions LEGO, the LEGO logo, the Brick, DUPLO, and MINDSTORMS are trademarks of the LEGO Group. Please respect their license.