Robotic Lawn Mowers often use a wire with a guide signal to keep the mower inside limits. This guide signal is in the audiable range and is picked up by electric guitars, basses and hearing aids. Of course, Lawn Mower manufacturers do their best to limit the disturbance? Think again. This hack solves most of the problem.

This part fits the charging station and allows for mounting of a microswitch, which switches from the normal guide wire to a small local loop around the charging station, which effectively eliminates magnetic interference from the lawn mower. You will need:

• this part
  • a microswitch with a long lever (see images)
  • a few meters extra guide wire
  • two few 3mm screws
  • three connectors for the microswith.

Make a small loop around the base of the charger ( I drilled small holes in the vertical support walls) - See image for detail
Connect the small loop to the normally open pin of the micro switchh and the big loop to the normally closed pin of the microswitch. Common ping goes to charging base.
Bend microswitch lever to engage safely when mower is docked.

Background:
I did the same hack to my old Worx Landroid (No 3D printing though), which I replaced with the Texas RMX600 recently. The Worx had the guide signal on always. The RMX600 actually switches off the guide signal when charging and on again when charging is complete, but the mower is still idle in the dock. I have no idea how sane engineers would keep the guide signal on at all time when it is not needed. FCC rules say that products are not allowed to cause unnecessary interference. .
The small loop is needed as the mower monitors the guide signal and requires a pin entry if the guide signal is lost.