The Hunter X-Core sprinkler controller has a 1-Wire interface via which individual zones and programmes can be started or stopped using a proprietary protocol. This interface is used to connect a receiver for the Hunter radio remote control. The aim of the project was to be able to control the system much more cost-effectively via a website.
Fortunately, there were already some similar projects, so this is just a combination of Rui Santos' ESP8266 Relay Module Web Server project and Sebastien's OpenSprinkler-Firmware-Hunter projects. You can proceed as follows:
When setting up, make sure that the operating voltage of the ESP and the Hunter X-Core are electrically isolated,
as the positive terminal of the ESP must be connected to an AC terminal on the Hunter X-Core.
Under no circumstances should the grounds of the ESP and the Hunter X-Core be connected to each other.
If the ESP is supplied with voltage via a commercially available USB charger, the galvanic isolation is given in the standard case.
Prototype with power supply over the Hunter X-Core:
This project requires specialist knowledge. Reproduction at your own risk and liability.