Hey thanks for posting this. I have ordered all the parts and about to start the build. My old Intermatic zwave Multiwave died.... I use HA for the automation side... Quick question... Why do you use 2 of the outputs from the Sonoff to drive your 24v relay?
Just getting ready to replace my old Intermatic MultiWave with a homegrown system. I use HA for control and looking to build one I have seen here. Long time Home Automation nerd. Graduated from Vera to HA about 2 years ago.