An alternative Firmware (experimental) for Ardumower PCB 1.3, Adafruit Grand Central M4 (or Arduino Due) and ArduSimple RTK kit
The robot mower uses RTK to localize itself (without a perimeter wire)
http://wiki.ardumower.de/index.php?title=Ardumower_Sunray
https://www.youtube.com/watch?v=yDcmS5zdj90
Ardumower Sunray Copyright (c) 2013-2020 by Alexander Grau, Grau GmbH
Licensed GPLv3 for open source use or Grau GmbH Commercial License for commercial use (http://grauonline.de/cms2/?page_id=153)