OpenSprinkler › Forums › Comments, Suggestions, Requests › External Access without DynDNS › Reply To: External Access without DynDNS July 17, 2015 at 7:23 pm #39350 RayKeymaster @Andreas: probably the easiest way is to set up a RPi to run the script and monitor the external IP change. The cheapest RPi (the A+ version) is only $20 US dollars, and you can power it via USB so it’s very power efficient.