Robotic Lawn Mower Additional Loops: Switch Box DIY

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Switchable Additional Loops for Robotic Lawn Mowers – 3D-Printed Switch Boxes
Efficient Control of Additional Garden Areas

1. Project Overview

Brief Description:
This project shows how a 3D-printed switch box can be used to flexibly extend or interrupt the boundary loop of a robotic lawn mower.
This allows secondary areas, pool bypasses, or temporary restricted areas (e.g., tent areas) to be easily included or excluded.

Main Features:

• Compatible with above-ground, underground, or mixed-laid boundary wires
• Mechanical switches for easy operation
• Weather-protected housing design
• Expandable for multiple additional loops

2. Application Scenarios

• Secondary Areas → mow only when desired
• Pool Bypass → Robotic lawn mower passes by
• Temporary Restricted Areas → e.g. for garden parties or construction work
• Flexible Garden Design → without permanent relocation of the cable

3. Functional Principle (Assembly Instructions)

• Representation of the Main Loop (charging station → boundary wire → back)
• Additional loops are switched on or off via a switch
• Large Loops: End at a different point of the main loop
• Small Loops: End at the same point (note magnetic field compensation)

4. Technical Implementation

• Materials:
  • Boundary Wire (Original or Compatible)
  • 3-way Connector (waterproof)
  • 3-way Toggle Switch (Round with 20 mm Diameter)
  • 3D-Printed Switch Box
  • Cable Connectors

  • Ground Anchors 

    MakerWorld: Lawn pegs for robotic lawnmowers

    MakerWorld: Lawn nail for robotic lawnmowers

• Print Parameters (Suggestion):
  • Material: PETG (weather resistant)
  • Layer height: 0.2 mm
  • Infill: 10 %
  • Wall thickness: 3–4 perimeter

• Assembly Notes:
  1. Disconnect power to the charging station
  2. Disconnect cables at defined points and connect switch box
  3. Wire switches according to instructions
  4. Close housing