OpenSprinkler Zone Expander provides an easy and inexpensive way to increase the number of stations for your OpenSprinkler. Each expander adds 16 zones.
NOTE: please choose the correct version. If you have OpenSprinkler 2.x, you must choose Expander 2.1. If you have OpenSprinkler 3.0 (built-in WiFi), you must choose Expander 3.0. These two versions come with different expansion cables, and cannot be plugged into each other: Expander 2.1 comes with a 2×4 wire cable and polarized connector; Expander 3.0 comes with a 2×5 ribbon cable and IDC connector.
Choose AC or DC depending on your main controller (DC controller is marked ‘DC’ on the front). For example, controller labeled ‘DC’ must use DC expander. Controller without such a label is AC-powered. You can also find out the power version when you reboot the controller.
OpenSprinkler Pi (OSPi) currently must use Expander 2.1 AC.