Sprinkler Controller 2.3 expansion

Expansion module for Sprinkler controller 2.3 or lower versions. PCB is universal to drive AC or DC latches just by placing proper driving transistor. Board is based on Ray Wang at open sprinkler

Main board available at https://oshwlab.com/jerry.komor/opensprinkler-2-3

More information at  http://PCBhut.com/Products/OS_2.3_expander/index.html