Drive motor and controller LEGO connectors
Set of LEGO-compatible connectors for a geared drive motor (YG2900) and two common motor controllers (HG7881 and L298N)
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updated February 27, 2025
Description
PDFConnectors with LEGO-compatible studs for mounting a geared drive motor (commonly called a YG2900) using M3 pan head screws and nuts - plus connectors for two common motor controllers (HG7881 and L298N).
The connectors can be used:
- either to build simple test beds for developing control code with (say) a Raspberry Pi or a simpler microcontroller like the ESP32, or
- for building complete LEGO constructs with ‘mechatronic’ moving parts.
More detailed context when used with a Raspberry Pi Maker Kit PCB assembly is available at this link and example ‘mechatronic’ software for a Raspberry Pi can be downloaded from here.
All the components use 1.75mm PLA and a layer height of 0.15mm with print details for each component produced on an i3 Mk3 shown in the table below.
| component file name/description | needs support (Y/N) | brim (mm) | filament length (m) | print time (i3 Mk3) |
| motor_vertical_LEGO_slim_case03_repaired.stl: connector that mounts the motor drive shaft vertically | Y | 5 | 9.07 | 3h 33m |
| motor_vertical_LEGO_adaptor02_repaired.stl: adaptor that connects to the motor drive shaft | N | 5 | 2.12 | 47m |
| motor_horizontal_LEGO_slim_case02.stl: connector that mounts the motor drive shaft horizontally | Y | 5 | 5.14 | 2h 08m |
| motor_horizontal_LEGO_case01.stl: alternative connector arrangement that mounts the motor drive shaft horizontally | Y | 5 | 7.38 | 3h 36m |
| HG7881_LEGO_3x3_tile01.stl: connector for the HG7881 motor controller | Y | 3 | 0.69 | 21m |
| L298N_LEGO_5x5_tile02.stl: connector for the L298N motor controller | Y | 3 | 1.7 | 46m |
Tags
Model origin
The author marked this model as their own original creation.
